Article
Engineering, Mechanical
Arshad Yazdanpanah, Mattia Franceschi, Gianluca Bergamo, Massimiliano Bonesso, Manuele Dabala
Summary: This study investigated the SCC and electrochemical behavior of selective laser melted 316L stainless steel under the combined effect of surface residual stresses and energy input variation. It was found that there was a significant correlation between columnar subgrains width and pore size with the electrochemical response and SCC susceptibility. A critical pore size affecting local corrosion behavior was identified, which decreased with an increase in residual stress magnitude.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Materials Science, Multidisciplinary
Arshad Yazdanpanah, Mattia Lago, Claudio Gennari, Manuele Dabala
Summary: The study investigated the effect of grinding-induced surface residual stress on stress corrosion cracking of SLM manufactured 316L austenitic stainless steel. High residual stress increased the risk of early SCC, with cracks initiating and propagating from melt pool boundaries, grains, machining marks, and pore sites. Galvanostatic tests identified three distinctive regions corresponding to crack and pit initiation and growth, highlighting the synergistic effects of dislocation density, stress concentration, molybdenum segregation, and surface residual stress on SCC susceptibility.
Article
Materials Science, Multidisciplinary
Jiapeng Sun, Qisheng Sun, Ying Liu, Bangjun Li, Zheng Zhang, Bingqian Xu, Songsong Xu, Ying Han, Yanxin Qiao, Jing Han, Guosong Wu, Paul K. Chu
Summary: The study investigates the use of ultrasonic severe surface rolling (USSR) to enhance the corrosion resistance of SLM 316L stainless steel, and finds that the USSR processed samples exhibit significant improvement in corrosion resistance, attributed to the unique gradient structure and chemically homogeneous and high-quality surface.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Deeparekha Narayanan, Lin Chen, Bilal Mansoor, Homero Castaneda
Summary: This study investigated the influence of process parameters on the pitting corrosion behavior of selective laser melted (SLM) 316L stainless steels in 3.5 wt% NaCl solution, and conducted a detailed analysis of the formed pits. Cyclic polarization tests were performed on the surfaces in the build direction, and the pits were characterized using scanning electron microscopy (SEM). The results showed that increasing the laser power improved corrosion resistance, while increasing the scan speed had a detrimental effect. Small pits were found to initiate at the melt pool boundaries and through dissolution of cell interiors, which possibly coalesced to form larger pits with a lacy cover formation.
Article
Nanoscience & Nanotechnology
Siqi Chen, Guoqiang Ma, Guilin Wu, Andrew Godfrey, Tianlin Huang, Xiaoxu Huang
Summary: The microstructure and chemical composition of 316L stainless steel prepared by selective laser melting were characterized. The study showed the presence of a multi-scale microstructure with equiaxed and columnar grains, dislocation cell blocks, individual dislocations, and nanosized particles. The misorientations across dislocation cells were determined, and the distribution of alloying elements and nitrogen content was also observed. The study found that dislocation strengthening and solid solution strengthening were the main contributing factors to the yield strength of the material.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Optics
Saad Waqar, Kai Guo, Jie Sun
Summary: The premature fractures, cracks, distortions, and delamination in selective laser melting manufactured components are among the most prominent challenges. Residual stresses are the main causes of these issues. Post processing techniques are commonly used to reduce these stresses, but they increase production time and costs. Therefore, developing in-process techniques to reduce residual stresses is crucial for large-scale production of metallic components.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Qi Chao, Sebastian Thomas, Nick Birbilis, Pavel Cizek, Peter D. Hodgson, Daniel Fabijanic
Summary: Additively manufactured 316L austenitic stainless steel was subjected to various heat treatments to study the evolution of residual stress, microstructure, and mechanical properties. Significant compressive residual stress was revealed in the as-built condition, with stress relief achieved at different temperatures. Microstructural changes, such as recrystallization, coarsening of nano-inclusions, and precipitation of embrittling phases, were observed during the heat treatment process, impacting the material's ductility and strength. The study established important relationships between heat treatment, properties, and microstructural changes for the structural application of SLM 316L.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Zahra Abbasi, Hamid Reza Abedi
Summary: This study investigates the hot deformation behavior and recrystallization mechanisms of selective laser melted 316L stainless steel. The results show that the development of substructures and continuous recrystallization are the main softening mechanisms during thermomechanical processing. The presence of cellular substructures facilitates recrystallization, and both discontinuous and geometric dynamic recrystallization contribute to the deformation process.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Manufacturing
Pradeep Kumar Shanmuganathan, Dinesh Babu Purushothaman, Marimuthu Ponnusamy
Summary: This study investigated the density, microhardness, and microstructural development of 316L stainless steel samples fabricated by selective laser melting process. The results showed that the selective laser melted 316L stainless steel demonstrated excellent printability and achieved near full density. The microhardness testing and phase composition analysis revealed that the performance of the selective laser melted 316L stainless steel specimens was slightly better than the wrought specimen.
3D PRINTING AND ADDITIVE MANUFACTURING
(2023)
Article
Nanoscience & Nanotechnology
W. W. Deng, H. F. Lu, Y. H. Xing, K. Y. Luo, J. Z. Lu
Summary: The effects of build direction and laser shock peening on the properties and microstructure of 316L stainless steel were investigated. The results showed that the strength and ductility of the stainless steel varied under different build angles and LSP treatments, with the sample fabricated at a 90-degree build angle and subjected to LSP having the best combination of strength and ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Ayan Bhowmik, Wengang Zhai, Wei Zhou, Sharon Mui Ling Nai
Summary: This study fabricated a TiC particle strengthened 316L stainless steel metal matrix composite using selective laser melting and characterized its microstructure with a focus on TiC carbides. Two families of TiC carbides were found in the SLM fabricated microstructure, formed along grain boundaries and in the grain interior. The contribution of nano-sized TiC precipitates to the strength of the composite was discussed, showing a significant increase in strength compared to pure 316L.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
Debajyoti Bhaduri, Tina Ghara, Pavel Penchev, Soumitra Paul, Catalin Pruncu, Stefan Dimov, David Morgan
Summary: A novel LP strategy was proposed to improve the re-melting of aluminium alloys by introducing a thermally insulating ceramic baseplate, resulting in significant reductions in surface roughness and residual stresses. The study highlights the importance of controlling heat dissipation in laser polishing of thermally conductive materials to achieve desired surface integrity properties.
APPLIED SURFACE SCIENCE
(2021)
Article
Engineering, Mechanical
Sultan AlRedha, Anton Shterenlikht, Mahmoud Mostafavi, Derreck Van Gelderen, Omar Eduardo Lopez-Botello, Luis Arturo Reyes, Patricia Zambrano, Carlos Garza
Summary: The study investigated the influence of build orientation on fracture toughness of additively manufactured AlSi10Mg specimens, finding that specimens printed in the T-L orientation yielded the highest fracture toughness. The anisotropic nature of SLM parts and the interaction between melt pool boundaries and micro-slipping during loading application were confirmed to impact fracture toughness.
RAPID PROTOTYPING JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Cuiling Zhao, Yuchao Bai, Yu Zhang, Xiaopeng Wang, Jun Min Xue, Hao Wang
Summary: This study investigated the corrosion behavior of additively manufactured 316L stainless steel under different scanning strategies using selective laser melting. The research found that the scanning strategy significantly influenced the corrosion resistance in different building directions, with pitting corrosion being the main form of corrosion.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Multidisciplinary
Bolin Li, Tingting Wang, Peizhen Li, Shenghai Wang, Li Wang
Summary: By adding Co-Cr-Mo-W to 316L stainless steel powder, the selective laser melting (SLM) of o-Cr-Mo-W/316L composite was produced, resulting in increased strength and improved corrosion resistance of the samples.
Article
Materials Science, Multidisciplinary
O. Gharbi, D. Jiang, D. R. Feenstra, S. K. Kairy, Y. Wu, C. R. Hutchinson, N. Birbilis
Article
Materials Science, Multidisciplinary
S. K. Kairy, O. Gharbi, J. Nicklaus, D. Jiang, C. R. Hutchinson, N. Birbilis
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2019)
Article
Materials Science, Multidisciplinary
D. Jiang, N. Birbilis, C. R. Hutchinson, M. Brameld
Article
Nanoscience & Nanotechnology
Derui Jiang, Xiang Gao, Yuman Zhu, Christopher Hutchinson, Aijun Huang
Summary: This study investigated the microstructure and mechanical properties of additively manufactured 25Cr SDSS using metal powder based DLD. The results showed that DLD produced 25Cr SDSS had a balanced duplex structure and exhibited superior tensile strength compared to the commercial wrought alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Review
Materials Science, Multidisciplinary
Wen Hao Kan, Louis Ngai Sam Chiu, Chao Voon Samuel Lim, Yuman Zhu, Yang Tian, Derui Jiang, Aijun Huang
Summary: Laser powder bed fusion is a promising additive manufacturing technique known for its ability to fabricate intricate components with minimal material wastage, yet it faces challenges such as porosity and poor repeatability. Research has been focused on understanding how porosity affects mechanical properties of alloys fabricated this way to aid in safe design and application of components.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Coatings & Films
Derui Jiang, Yang Tian, Yuman Zhu, Aijun Huang
Summary: Electropolishing using an environmentally safe deep eutectic solvent (DES) is an effective method to reduce the surface roughness of LPBF produced parts, improving their mechanical and electrochemical properties. DES is also found to have better corrosion resistance.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Engineering, Manufacturing
Wen Hao Kan, Derui Jiang, Matthew Humbert, Xiang Gao, Vijay Kumar Bhatia, Gwenaelle Proust, Yuman Zhu, Peter Hodgson, Aijun Huang
Summary: A novel micro-rolling set-up was used in the study to achieve in-situ grain refinement and porosity closure in 316L stainless steel parts. Micro-rolling resulted in increased part density, improved internal grain substructure, and increased hardness and yield strength. The corrosion resistance of the alloy was not affected, and ductility was maintained.
ADDITIVE MANUFACTURING
(2022)
Article
Nanoscience & Nanotechnology
Derui Jiang, Yang Tian, Yuman Zhu, Shuai Huang, Aijun Huang
Summary: This study demonstrates the feasibility of using a core-shell approach combined with hot isostatic pressing (HIP) to improve the productivity of laser powder bed fusion (LPBF) process for producing Hastelloy-X (HX) components. The core-shell HX with HIP treatment shows a grain size gradient from shell to core, leading to better mechanical properties compared to the HX without the core-shell structure. Moreover, the core-shell approach significantly improves the LPBF production rate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
G. Sander, D. Jiang, Y. Wu, N. Birbilis
MATERIALS & DESIGN
(2020)
Article
Materials Science, Multidisciplinary
Oumaima Gharbi, Shravan Kumar Kairy, Paula Roberta De Lima, Derui Jiang, Juan Nicklaus, Nick Birbilis
NPJ MATERIALS DEGRADATION
(2019)
Article
Materials Science, Multidisciplinary
Zhichao Shang, Xiaoping Cai, Farshid Pahlevani, Yan Zheng, Akbar Hojjati-Najafabadi, Xinran Gao, Baojing Zhang, Peizhong Feng
Summary: High porosity Co-Al-Fe intermetallics with 3D-microstructures were successfully synthesized in one step via a thermal explosion reaction. The link between pore structure and permeability was investigated using 3D-XRM technology. The corrosion resistance of the samples with different Fe contents was studied at 900 degrees C under an oxygen/sulphur atmosphere for up to 120 h. The results showed that the samples maintained stable pore structure and intact internal matrices, attributed to the formation of a thin protective layer on the surface. In addition, inward diffusion of S resulted in the formation of FeS nodules.
Article
Materials Science, Multidisciplinary
Lian Ma, Hain Yang, Daquan Zhang, Wei Wu
Summary: In this study, an environmentally friendly volatile corrosion inhibitor, lysine salts (LA), was prepared between graphene oxide (GO) layers using an in situ intercalation technique. The corrosion inhibition effect of LA was evaluated, and it was found that LA-GO2 achieved a 99.3% corrosion inhibition efficiency after composition optimization. The inhibition of the electrochemical anodic process on the surface of mild steel was the main reason for the high corrosion inhibition efficiency of LA-GO2. The properties of the surface film on the corroded steel were also characterized in detail to understand the corrosion inhibition mechanism of LA-GO2.
Article
Materials Science, Multidisciplinary
Running Wang, Jiaping Zhang, Bing Liu, Jie Fei, Qiangang Fu
Summary: By introducing a tailored SiC-C interphase, the carbon fiber can be effectively protected, improving the mechanical and ablation properties of leading edge shaped C/C-ZrC-SiC composites.
Article
Materials Science, Multidisciplinary
Zihua Wang, Chijia Wang, Ruitao Wang, Jiapeng Deng, Kun Zhang, Yanji Zhu, Huaiyuan Wang
Summary: A robust anti-corrosive coating has been developed using functional fly ash, which demonstrates excellent corrosion resistance and improved mechanical properties. The coating achieves these enhancements through molecular cross-linking design and surface augmentation techniques, resulting in a significantly improved impedance modulus compared to pure polyurea coatings.
Article
Materials Science, Multidisciplinary
Haofei Sun, Meifeng Li, Hao Zhang, Jing Liu
Summary: The oxidation behavior of FeCrNi medium entropy alloy was investigated through experimental observations and density functional theory (DFT) calculations. The study found that at 900 degrees C, the alloy forms a desirable and continuous oxide layer, while at 1000 degrees C, the oxide layer becomes discontinuous with penetration of oxide. These observations highlight the significant role of phase structure in promoting the formation of protective oxide scales and influencing oxidation resistance.
Article
Materials Science, Multidisciplinary
Yang Li, Ke Ma, Jingjun Xu, Jingjing Li, Yueming Li, Yi Zhang, Jun Zuo, Meishuan Li
Summary: Cr2AlC diffusion barrier effectively blocks the diffusion of Ti, enhancing the stability and spalling resistance of the Al2O3 scales between NiCrAlY coating and TiAl alloy.
Article
Materials Science, Multidisciplinary
Weiyi Wang, Qinglin Pan, Xiangdong Wang, Bing Liu
Summary: By adding Ce, Sc, Y and Zr elements to Al-Mg-Si alloy, the microstructure of the alloy can be regulated, and the corrosion and heat resistance of the materials can be improved.
Article
Materials Science, Multidisciplinary
Andrea Cristoforetti, Javier Izquierdo, Ricardo M. Souto, Flavio Deflorian, Michele Fedel, Stefano Rossi
Summary: This study presents a new approach to studying the mechanism of filiform corrosion in organic coated steel using the scanning vibrating electrode technique (SVET) and micropotentiometry (potentiometric SECM). The electrochemical activity under the coating was evaluated by mapping the ionic current densities coming from artificial defects made in specific locations of the filament. Antimony tips were also used to investigate the pH changes associated with different corrosion reactions at the metal-paint interface. Local pH levels along the filament in the anodic and cathodic regions were determined.
Article
Materials Science, Multidisciplinary
Yang Gao, Dayun Sun, Zhu Liu, Shuo Cong, Rui Tang, Yanping Huang, Lefu Zhang, Xianglong Guo
Summary: The corrosion characteristics of a novel alumina-forming austenitic steel in high-pressure high-temperature water environment were studied. The addition of aluminum has a negative effect on the continuity of the alumina scale.
Article
Materials Science, Multidisciplinary
Negin Madelat, Benny Wouters, Peter Visser, Zahra Jiryaeisharahi, Kristof Marcoen, Shoshan T. Abrahami, Annick Hubin, Herman Terryn, Tom Hauffman
Summary: This work explores the correlation between electrolyte transport properties and the variation of pigment volume concentration (PVC) in organic coatings. An odd random phase electrochemical impedance spectroscopy (ORP-EIS) approach is used to analyze the diffusion of ions independent from water uptake. The results show that a higher PVC leads to a more homogeneous coating structure, resulting in faster diffusion of ions and enhanced water uptake.
Article
Materials Science, Multidisciplinary
Eloa Lopes Maia, Serguei Gavrilov, Valentyn Tsisar, Kitty Baert, Iris De Graeve
Summary: The effect of pre-oxidation in air at 300-500°C on the initiation and development of liquid metal corrosion attack on 316L austenitic steel in static lead-bismuth eutectic (LBE) has been investigated. It was found that pre-formed oxide films can protect the surface against dissolution, while high temperature pre-oxidation leads to localized corrosion.
Article
Materials Science, Multidisciplinary
Baozhuang Sun, Qiuyu Wang, Yue Pan, Zhiyong Liu, Cuiwei Du, Xiaogang Li
Summary: In this study, a non-steady electrochemical model was established to investigate stress corrosion cracking (SCC). The model was verified using 304 SS with various microstructures, confirming its effectiveness in assessing SCC susceptibility.
Article
Materials Science, Multidisciplinary
Xingyu Xiao, Xinhua Liu, Zhilei Wang, Xuexu Xu, Mingying Chen, Jianxin Xie
Summary: The corrosion behavior and mechanisms of Cu-10Ni-X (Al, Fe, Mn, Cr, Sn, Ti, Zn) alloys in a 3.5% NaCl solution were systematically investigated. Both computational and experimental results revealed that except Ti, other elements could enhance the corrosion resistance of Cu2O passivation film.
Article
Materials Science, Multidisciplinary
Gen Zhang, Yan-Ping Huang, E. Jiang, Wei -Wei Liu, Hong Yang, Jing Xiong, Yong-Fu Zhao
Summary: The addition of aluminum has a significant influence on the intermetallic compounds in AFA alloys, particularly increasing the content of B2-NiAl phase. In the SCO2 environment, the oxide scales formed on AFA alloys with aluminum were thinner than on ASS without aluminum, and the structure of the oxide scales changed to a double-layer structure.
Article
Materials Science, Multidisciplinary
Yuxuan He, Guozheng Xiao, Chao Wang, Xuefeng Lu, Liuyuan Li, Shiying Liu, Yusheng Wu, Zhanjie Wang
Summary: The relationship between configurational entropy and lattice distortion in novel rare earth monosilicates was investigated, and the effect of configurational entropy on their properties was studied. The results showed that lattice distortion increased with the increase of configurational entropy, but a highly symmetrical crystal structure was formed when the configurational entropy was large enough, inhibiting the lattice distortion.
