Article
Optics
Alireza Karimi, Arash Karimipour, Mohammad Akbari, Mohammad Mehdi Razzaghi, Mehdi Jamali Ghahderijani
Summary: In this study, laser welding of dissimilar A516 low carbon steel and duplex stainless steel was performed to investigate the influence of laser welding parameters on the mechanical properties and microstructure. The highest tensile strength of 500 MPa and 18% elongation were achieved with a laser power of 400 W, welding speed of 300 mm/min, and focal point. The microstructure of the fusion zone consisted of ferrite-austenite distribution from duplex stainless steel and fully martensitic structure from the A516 side.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Ming Du, Wenquan Wang, Xinge Zhang, Jiafei Niu
Summary: This study utilized laser offset welding to join TWIP steel and aluminum alloy dissimilar metals, and found that adjusting welding process parameters significantly improved the tensile strength of the welded joint. Factors such as intermetallic compounds layer thickness, crystal structure, and crack defects were found to influence the strength of the joint.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Hana Sebestova, Petr Hornik, Sarka Mikmekova, Libor Mrna, Pavel Dolezal, Jan Novotny
Summary: The presence of Al-Si coating on 22MnB5 leads to the formation of large ferritic bands in the microstructure of butt laser welds, weakening the weld joints. Using hybrid laser-TIG welding technology can eliminate the large ferritic bands and improve the tensile strength of the welds.
Article
Optics
Mingyang Zhang, Chunming Wang, Gaoyang Mi, Ping Jiang, Xiong Zhang
Summary: This study proposes a Ti powder assisted laser welding strategy for SiCp/2A14Al welded joints. The results showed the formation of regular octahedral TiC and irregular TiAl3 intermetallic dispersed in the Al matrix. Fracture morphology images revealed that the fracture location was the SiC enrichment zone. Additionally, potential technology and design mechanisms for powder feeding laser welding SiCp/2A14Al composites were discussed.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
YiDi Gao, Yan Zhang, Yan Xu, JianPing Zhou
Summary: This study successfully implemented the connection of CP-Ti with 304 stainless steel (SS) and T2 bimetallic sheets using laser-induction heating welding technology, avoiding the formation of brittle intermetallics and achieving a high tensile strength joint.
Article
Materials Science, Multidisciplinary
Sameera J. Vaikar, Varun Narayanan, Joshy Chellathu George, T. C. Kanish, K. Devendranath Ramkumar
Summary: Pulsed direct current gas tungsten arc welding (GTAW) was used to weld 12 mm thick plates of naval, marine-grade high strength low alloy steel (HSLA) using ER80S-Ni3 filler metal. The microstructural analysis showed a mixed microstructure of acicular ferrite, polygonal ferrite, grain boundary ferrite, and bainite ferrite in the fusion zone. The PDCGTA weld joints exhibited superior yield and tensile strengths compared to the base metal, and a joint efficiency of 122% was observed during notch tensile studies. The impact toughness of the weld joints was higher than that of the base metal, and the formation of acicular ferrite and bainite ferrite contributed to better tensile and impact properties at room temperature. The joints also showed a transition from ductile to brittle fracture mode as the temperature decreased.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Jun Wang, Cheng Ma, Jian Han, Zhengyi Jiang, Valerie Linton
Summary: In this study, the flash butt welding (FBW) of high-strength low-alloy steel was physically simulated, and it was found that a moderate increase in upset allowance (Δu) can enhance the microstructural and mechanical properties of the welds, leading to excellent strength and plasticity compatible with the base metal. These findings will provide valuable guidance for practical FBW processes.
Article
Materials Science, Multidisciplinary
Enrico Salvati, Alex Lanzutti, Michele Magnan, Lise Sandnes, Filippo Berto, Oystein Grong
Summary: The present study focuses on the microstructural characterization of a 4mm thick AA6082-T6 HYB butt weld, with particular emphasis on the region of the joint ThermoMechanical Affected Base Material (TMA-BM). The study reveals the formation of sharp interfaces or porosity between the base and the filler material, as well as grain refinements in the base material and the softening behavior experienced in the TMA-BM of the weld. The findings provide important insights into the microstructural aspects of this type of joint and guide future research investigations.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Ming-Feng Chiang, Ping-Hui Chien, Tzu-Yuan Lo, Ren-Kae Shiue
Summary: A nickel-based filler wire, Inconel 82, was used to weld a high-silicon steel plate with a deviation in chemical composition due to incomplete mixing/convection. The microstructure of the weld bead was primarily composed of austenite and martensite, mainly influenced by the Ni concentration. A Schaeffler diagram was utilized to predict the structure and phase(s) of the Fe-based weld bead. This study proposes a methodology for analyzing weld metal with unconventional alloy compositions.
Article
Materials Science, Multidisciplinary
Wenshen Tang, Xinqi Yang, Shengli Li, Huijun Li
Summary: This study investigated a zigzag line defect in the stir zone of friction stir butt-welded 12% Cr ferritic stainless steel joint, clarifying its characteristics and formation cause. The defect showed partly bonded feature with relatively higher hardness, and may affect impact toughness.
Article
Materials Science, Multidisciplinary
Shikai Wu, Yilei Shi, Hongbin Liao, Xiaoyu Wang
Summary: This study focused on the microstructural evolutions and mechanical properties of welding joints produced via laser beam welding (LBW) and electron beam welding (EBW). Both types of joints exhibited excellent tensile properties and impact toughness, with LBW joints showing higher impact toughness.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Engineering, Marine
Xudong Gao, Yongbo Shao, Cheng Chen, Hongmei Zhu
Summary: In the welding process of high-strength steel, the formation of welding residual stress (WRS) due to intense temperature change affects the fatigue crack growth rate. Developing an accurate finite element (FE) model that considers solid-state phase transformation (SSPT) and material hardening law is crucial for predicting the WRS distribution and improving the quality of welded structures. Experimental tests and numerical simulations were conducted on EQ56 HSS, and the results showed that plastic hardening laws and the inclusion of SSPT behavior in the FE model significantly influenced the precision of the predicted WRS distribution.
Article
Nanoscience & Nanotechnology
T. Muthu Krishnan, C. Balamurugan, I Dinaharan, R. Palanivel
Summary: Magnetically impelled arc butt (MIAB) welding has been used to effectively join 4 mm thick AISI 409 ferritic stainless steel tubes. Variation in arc duration influences heat energy transfer and weld zone size, resulting in increased hardness of the weld zone.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Mingyang Zhang, Chunming Wang, Gaoyang Mi, Ping Jiang, Xiong Zhang, Xiuhui Yan
Summary: SiCp/Al matrix composites have been widely used in aerospace and space station applications. However, the poor formability and low tensile strength in laser welding SiCp/AMCs have been a bottleneck. By using counterintuitive laser butt welding and proposing the concept of 'Perforating Laser Welding,' a high-strength welded joint was successfully prepared with enhanced load transfer capability through tailored interfaces.
Article
Materials Science, Multidisciplinary
Yunfei Meng, Laihege Jiang, Ling Cen, Ming Gao
Summary: In this study, laser-arc hybrid welding combined with beam oscillation was used to suppress the formation of brittle intermetallic compounds at the interface of Al/steel butt-joints, leading to improved uniformity of the weld. The optimized frequency of 150 Hz successfully suppressed weld defects and transformed the interface from an uneven two-layer IMCs to a uniform single-layer IMCs, resulting in a 65% increase in tensile property and a 96% enhancement in bending property.
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
(2021)
Article
Metallurgy & Metallurgical Engineering
Shiwei Zhang, Yadong Wang, Zhihui Xiong, Minhao Zhu, Zhijie Zhang, Zhuguo Li
Summary: The study investigated the effects of activating fluxes on weld bead morphology, arc behavior, electrical signals, and temperature field. Results showed that the addition of SiO2, TiO2, ZnO, and Fe2O3 improved weld formation and penetration depth, while also reducing welding voltage and increasing welding current. However, CaO and B2O3 dramatically deteriorated process stability.
WELDING IN THE WORLD
(2021)
Article
Materials Science, Multidisciplinary
Wenjie Ren, Yuan Chen, Ling Lan, Fenggui Lu, Zhuguo Li
Summary: The laser-welded Inconel 617 superalloy exposed at 750 degrees C for up to 7000 h showed the formation of carbides and phases, resulting in an increase in hardness and a significant drop in impact toughness.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Materials Science, Multidisciplinary
Hongyu Xiao, Jiwei Geng, Yugang Li, Hongping Li, Dong Chen, Mingliang Wang, Zhuguo Li, Haowei Wang
Summary: In this study, the quench sensitivity of TiB2/7050Al composite was investigated using Jominy end quench test. It was found that the hardness decreased significantly with increasing distance from the quenching end, as more eta phases precipitated and coarsened on grain boundaries. The composite was observed to be more quench sensitive than its alloy counterpart, attributed to four microstructure characteristics inherited from the aluminum matrix and originating from the TiB2 addition.
JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Nanoscience & Nanotechnology
Zhihui Xiong, Xiaotong Pang, Shilong Liu, Zhuguo Li, R. D. K. Misra
Summary: The addition of nickel (Ni) in selective laser melted titanium alloy can effectively refine grain size, avoid the formation of brittle phases, and significantly increase the strength and ductility of the alloy. Microalloying with Ni enhances the properties of titanium alloys processed by additive manufacturing.
SCRIPTA MATERIALIA
(2021)
Article
Nanoscience & Nanotechnology
Bolun Han, Chengcheng Zhang, Kai Feng, Zhuguo Li, Xiancheng Zhang, Yao Shen, Xiaodong Wang, Hiroyuki Kokawa, Ruifeng Li, Zhiyuan Wang, Paul K. Chu
Summary: The study fabricated a near full-dense hierarchical CrCoNi medium entropy alloy (MEA) using selective laser melting (SLM), achieving superior yield strength at 77K. The high strength of the material stems from a hierarchical microstructure composed of high-density dislocations and low-angle grain boundaries (LAGB). The results suggest that SLM is a viable technique for fabricating dense hierarchical CrCoNi MEA and offer a design strategy to further improve mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Xiaotong Pang, Zhihao Xiong, Shilong Liu, Devesh Misra, Zhihui Xiong, Zhuguo Li
Summary: This study elucidates the microstructural evolution and strengthening mechanism of commercial purity Ti (CP-Ti)/Ti-0.4Ni graded material (GM) fabricated by laser melting deposition (LMD). Microalloying with Ni in the GM improved the mechanical properties and avoided composition reapportionment issues at the interface, highlighting the potential of microalloyed Ti-0.4Ni for providing high-performance graded materials by LMD.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Metallurgy & Metallurgical Engineering
Hong-yu Xiao, Yu-gang Li, Ji-wei Geng, Hong-ping Li, Ming-liang Wang, Dong Chen, Zhu-guo Li, Hao-wei Wang
Summary: This study investigates the effects of TiB2 and Zr on the microstructure, aging response, and mechanical properties of hot-extruded Al-Zn-Mg-Cu based materials. It was found that TiB2 can refine grain size and enhance hardness, while Zr primarily inhibits grain growth. Both additives have some positive impacts on aging kinetics and hardness.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Review
Optics
Dongshi Zhang, Zhuguo Li, Koji Sugioka
Summary: The demand for new nanoscience-based technologies is increasing, with LAL gaining attention for nanomaterial synthesis. It is easy to set up and perform, allowing for a diverse range of nanomaterials to be synthesized using different targets and liquids, with the choice of liquids impacting the final products significantly.
JOURNAL OF PHYSICS-PHOTONICS
(2021)
Article
Materials Science, Multidisciplinary
Ruijie Liu, Dongshi Zhang, Zhuguo Li
Summary: This study demonstrates the development of tunable iridescent antireflective surfaces through femtosecond laser ablation of tungsten and molybdenum, synthesizing functional metal-oxide nanomaterials, in situ deposition and hierarchical nanostructuring of LIPSSs. Adjusting the scanning interval allows modulation of particle deposition rates on the surface, leading to the formation of better ultrabroadband antireflective surfaces with less pronounced iridescence. Loose deposition of MoOx and WOx particles outperforms tight deposition for ultrabroadband antireflective applications, enhancing antireflectance performances significantly.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Xiaotong Pang, Zhihui Xiong, Chengwu Yao, Junhao Sun, R. D. K. Misra, Zhuguo Li
Summary: The metastable beta titanium alloy TB2 fabricated by laser melting deposition showed good ductility and high ultimate tensile strength. The beta solution plus two-step aging treatment was proved to achieve a good combination of strength and ductility for the TB2 alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Coatings & Films
Yulei Feng, Xiaotong Pang, Kai Feng, Yueqiao Feng, Zhuguo Li
Summary: A novel test method, self-restraint test, was proposed to evaluate the crack resistance of high hardness coatings prepared by laser cladding. The method was effective in evaluating different coatings and establishing empirical formulas. It has significant implications for the preparation of high hardness crack-free coatings.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Chemistry, Physical
Yulei Feng, Xiaotong Pang, Kai Feng, Yueqiao Feng, Zhuguo Li
Summary: Fe-based coatings were prepared on 42CrMo by laser cladding with a trace amount of boron added. The effect of additive boron level on the reinforcements and compressive properties of the coating was analyzed. It was found that the addition of boron can significantly improve the strength and plasticity of the coating, and a eutectic structure composed of Fe3C type carbides and gamma-Fe was formed by reducing the formation energy of Fe3C.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Hongyu Xiao, Zhiping Wang, Jiwei Geng, Chengcheng Zhang, Yugang Li, Qing Yang, Mingliang Wang, Dong Chen, Zhuguo Li, Haowei Wang
Summary: This study investigated the precipitation and crystallographic relationships between the quench-induced S phase and Al matrix in an Al-Zn-Mg-Cu alloy using scanning transmission electron microscopy and scanning precession electron diffraction. It was found that higher lattice strain energy led to Zn segregation at the S-Al interfaces and the heterogeneous nucleation of nanosized eta' precipitates. The crystallographic orientation relationships between the S phases and precipitates were reported and discussed for the first time in an Al-Zn-Mg-Cu alloy.
SCRIPTA MATERIALIA
(2022)
Article
Engineering, Electrical & Electronic
Ruijie Liu, Dongshi Zhang, Sihan Ji, Yunyu Cai, Changhao Liang, Zhuguo Li
Summary: This study demonstrates the development of multifunctional metasurfaces through femtosecond laser ablation of titanium, resulting in macropore/LIPSS micro/nanostructures. These structures exhibit superior performance in ultrabroadband UV-vis-NIR-MIR absorbance, photothermal conversion, and thermal-emission induced reflectance oscillation. The density and size of macropores can be controlled by adjusting laser power and scanning velocity, allowing for optimization of different functions.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Optics
Dongshi Zhang, Xinzhuo Li, Yao Fu, Qinghe Yao, Zhuguo Li, Koji Sugioka
Summary: This work reveals that fluid dynamics induced by femtosecond laser ablation in liquid can break the laser polarization state restriction and produce irregular circular-LIPSS and crisscross-LIPSS. Liquid vortex plays a crucial role in the formation of macropores and complex fluid dynamics on mountain-like microstructures can cause the formation of CCLIPSS. This opens up new possibilities to diversify the morphologies of LIPSS formed by femtosecond laser ablation in liquid.
OPTO-ELECTRONIC ADVANCES
(2022)