Article
Materials Science, Multidisciplinary
Naofumi Ohtsu, Koyo Miura, Mitsuhiro Hirano, Kenji Kodama
Summary: The study showed that a thick surface layer was formed when using H-2-N-2 plasma on AISI316L, while Ar-N-2 plasma was ineffective for nitriding. The population of N-2(+) species in the plasma was identified as a key factor for optimization.
Article
Materials Science, Coatings & Films
Darina Manova, Stephan Maendl
Summary: Expanded austenite formed by inserting nitrogen into austenitic stainless steel is a puzzling phase. This study investigates the initial phase transition and the formation of two sequential phases with different expansion rates over time. The driving force is believed to be the threshold nitrogen concentration.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Coatings & Films
Zhen Huang, Zi-Xin Guo, Lei Liu, Yuan-Yuan Guo, Jun Chen, Ze Zhang, Jin-Long Li, Yan Li, Yan-Wen Zhou, Ying-Shuang Liang
Summary: Nitriding of AISI 316L austenitic stainless steel under various pulsed bias conditions resulted in different phase structures, thicknesses, and hardness of the nitrided layer, which in turn affected the corrosion resistance of the material.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Yangyang Lu, Dong Li, Heng Ma, Xiliang Liu, Meihong Wu, Jing Hu
Summary: The research shows that severe plastic deformation can significantly enhance the efficiency of plasma nitriding, increase the thickness and hardness of the nitriding layer, and greatly improve the wear resistance.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Chemical
Javad Taghinejad, Ali Reza Niknam
Summary: Using the trapping-detrapping model, we investigated the effects of collisionless and collisional plasmas on the nitrogen diffusivity in austenitic stainless steel. We found that the plasma characteristics have considerable effects on the nitrided layers, especially in the initial layers. Experimental results also showed that the ion transport mechanism in collisional plasma agrees well with the observations.
PLASMA CHEMISTRY AND PLASMA PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Okan Unal, Erfan Maleki, Remzi Varol
Summary: The study indicates that pulsed plasma nitriding can significantly increase nitriding depth, transform austenite structure into S-phase, and eventually convert it to CrN precipitation. Surface hardness and fatigue limit are both improved, with the best results obtained at 550 degrees C for 4 hours.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Kenzo Sumiya, Shinkichi Tokuyama, Akio Nishimoto, Junichi Fukui, Atsushi Nishiyama
Summary: Low-temperature active-screen plasma nitriding (ASPN) was successfully applied to improve the bending rigidity and corrosion resistance of a small-diameter thin pipe made of austenitic stainless steel. Increasing nitriding temperature led to thicker nitriding layer, higher surface hardness, and increased bending load. Corrosion was observed only near the tip of the nitrided samples at high nitriding temperatures during salt spray test.
Article
Materials Science, Multidisciplinary
Khaled Chemaa, Salim Hassani, Mohamed Kezrane, Mohamed Mounes Alim, Amar Manseri
Summary: The Plasma Immersion Ion Implantation (PIII) technique can significantly enhance the hardness and wear resistance of stainless steel coatings.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Metallurgy & Metallurgical Engineering
Suman Patel, B. Ganguli, S. K. Chaudhury
Summary: The study found that active screen plasma nitriding of 347H austenitic stainless steel at higher temperatures results in higher hardness and lower wear loss compared to nitriding at lower temperatures, primarily due to the formation of a higher amount of hard nitride phase(s) in the nitrogen-enriched layer.
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2022)
Article
Nanoscience & Nanotechnology
Hua Jiang, Tatsuki Watanabe, Chihiro Watanabe, Norimitsu Koga, Hiromi Miura
Summary: Systematic investigations were conducted on the deformation behavior and microstructure evolution of heterogeneous nanostructured (HNed) SUS316LN austenitic stainless steel at cryogenic temperature (77 K). The HNed steel showed excellent strength/ductility balance due to the high inherent strength of the heterogeneous nanostructure (HN) and significant work hardening caused by transformation-induced plasticity (TRIP). Deformation-induced martensitic transformation (DIMT) occurred in different regions, resulting in different microstructure evolution. Preparing ultrafine HN improved the yield and ultimate strength at cryogenic temperature.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Coatings & Films
Cecilie Funch, Kinga Somlo, Thomas L. Christiansen, Marcel A. J. Somers
Summary: This study investigated the effects of different thermochemical post-processing treatments on additively manufactured austenitic stainless steel. It was found that austenitization in vacuum caused a reduction in nitrogen content near the surface, which could be remedied by adding nitrogen gas during the process. High temperature solution nitriding effectively increased surface hardness while maintaining a fine structure inside the grains. The as-built condition exhibited an excellent combination of strength and ductility, but had a low degree of work-hardening. The vertically built condition showed lower strength and earlier yielding compared to the horizontally built conditions. High temperature treatments efficiently reduced the mechanical anisotropy observed in the as-built condition. A combination of high- and low-temperature surface hardening methods, including nitriding, carburizing, and nitrocarburizing, resulted in the development of expanded austenite on the surface and a significant increase in hardness.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Coatings & Films
T. Bergelt, P. Landgraf, T. Grund, G. Braeuer, T. Lampke
Summary: Nitriding is a common method to improve the surface properties of steels. This study aims to numerically describe a plasma-nitriding process for high-alloy tool steel and nitriding steel, and predict the resulting layer thickness and nitrogen distribution. The results show that the nitriding zone increases with temperature and time, and areas with carbides have lower layer thicknesses.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Sergei Kusmanov, Tatiana Mukhacheva, Ivan Tambovskiy, Alexander Naumov, Roman Belov, Ekaterina Sokova, Irina Kusmanova
Summary: The results show that modifying the surface of austenitic stainless steel through anodic plasma electrolytic treatment improves the surface properties such as smoothness, hardness, and wear resistance. Different electrolytes were used for the treatment, resulting in the formation of different diffusion layers. The study also reveals the correlation between the friction coefficient and the surface roughness.
Article
Chemistry, Physical
Karolina Wierzbowska, Agnieszka Elzbieta Kochmanska, Pawel Kochmanski
Summary: A new slurry cementation method was used to produce silicide-aluminide protective coatings on austenitic stainless steel 1.4541, which were then subjected to gas nitriding. The results showed that the corrosion resistance of the coatings strongly depended on the phase composition, and the highest resistance was achieved with a high manufacturing temperature.
Article
Materials Science, Multidisciplinary
Teresa Moskalioviene, Paulius Andriunas, Arvaidas Galdikas
Summary: In this paper, the diffusion of nitrogen in single-crystalline austenitic stainless steel during modified layer formation and thermal annealing is investigated. A diffusion equation system is derived from Fick's laws, which takes into account multiple driving forces and considers trapping and detrapping phenomena. The effects of anisotropic elasticity on the stress field in single-crystal austenitic stainless steel are also studied. The proposed model is used to simulate the nitrogen transportation process in AISI 316L and the results are compared with experimental data.
Article
Materials Science, Coatings & Films
Yanchun Xie, Xiaodong Wang, Shenshen Cui, Jiali Hu, Yongcun Wei, Yi Lian, Anwu Xuan, Bin Yu, Erlin Zhang
Summary: In this study, Ti-xFe (x = 3,5,9 wt%) alloys were surface modified by micro-arc oxidation (MAO) to improve their antimicrobial properties and biocompatibility. The results showed that increasing the oxidation voltage greatly enhanced the roughness and hydrophilicity of Ti-xFe-MAO alloys. The Ti-xFe alloys micro-arc oxidized at 250 V and 300 V exhibited improved corrosion resistance and excellent antimicrobial and cytocompatibility properties, making them suitable for orthopedic implant materials.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Yuting Hao, Zuoyan Ye, Lili Wang, Minheng Ye, Hui Dong, Chao Wang, Yunchen Du
Summary: This study focuses on the modification of PEO coatings on Ta-12W alloy using NH4F additive. The results show that ultra-low porosity coatings can be prepared by optimizing the NH4F content. The formation process of specific structures on the coating surface is discussed, and the effects of NH4F concentration and treatment duration on coating characteristics are investigated.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Yuanzhuo Liu, Linjiang Chai, Tao Yang, Chaodan Hu, Chuanmei Wang, Guoqiang Xi
Summary: By employing a pulsed laser, laser cladding was performed on IN718 alloy pre-coated with CrCoNi-TiC/SiC powders and three defect-free coatings were successfully prepared. The addition of TiC and SiC powders generated fine carbides dispersed in the coatings and led to changes in grain and substructure morphologies, resulting in increased hardness and wear resistance.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
M. Ghaemi, A. Lopez-Cazalilla, K. Sarakinos, G. J. Rosaz, C. P. A. Carlos, S. Leith, S. Calatroni, M. Himmerlich, F. Djurabekova
Summary: The use of high-power impulse magnetron sputtering can result in dense and uniform niobium films on all surfaces of superconducting rf cavities, as simulated and investigated in this study.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Jiaheng Du, Xinli Fan, Dongqin Xiao, Wuxiang Wang, Yiran Yin, Zhong Li, Kui He, Yanfei Tan, Jiyuan Yan, Gangli Liu, Ke Duan
Summary: This study investigated the electrophoretic deposition (EPD) of magnesium oxide (MgO) coatings on micro-arc oxidized titanium (MAO-Ti) and evaluated their in vitro antibacterial properties and biocompatibility. The results showed that MgO coatings significantly reduced bacterial numbers and biofilm formation, while also demonstrating good cytocompatibility and induction of osteoblast mineralization.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Samiksha Moharana, Yuichi Otsuka, R. Gnanamoorthy
Summary: The addition of titania to HAp coatings improves their wear resistance and reduces damage to titanium implants caused by debris generation. This study evaluates the fretting wear resistance of titania-added HAp suspension plasma spray coating and finds that it exhibits reduced friction coefficient and increased wear resistance.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Li-Ping Wu
Summary: The functional hazenite coating deposited on AZ31 Mg alloy showed improved roughness and hydrophilicity, enhanced biocompatibility, reduced degradation rate, and decreased susceptibility to stress corrosion cracking.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Ning Tian, Delei Xu, Jinfei Wei, Bucheng Li, Junping Zhang
Summary: This study reports the preparation of a superhydrophobic and anti-bacterial fabric for face masks. The fabric exhibits high superhydrophobicity and excellent moisture resistance, enabling functionality effectiveness in cold weather conditions. The fabric also demonstrates remarkable anti-bacterial activity against E. coli, attributed to the synergistic effect of superhydrophobicity and embedded ZnO nanoparticles. This superhydrophobic anti-bacterial fabric holds great potential for various practical applications in personal protective equipment, healthcare, and disease prevention.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Katharina Beck, Anke S. Ulrich, Andreas K. Czerny, Emma M. H. White, Martin Heilmaier, Mathias C. Galetz
Summary: Refractory metal based alloys have great potential as structural materials for high-temperature applications due to their high melting points. However, they are prone to catastrophic oxidation at around 700 degrees C. This study investigated the effect of aluminium diffusion coatings on the oxidation resistance of pure molybdenum, niobium, tantalum, and tungsten. The results showed that the aluminization improved the oxidation behavior and decreased the oxide growth rate for molybdenum and tantalum.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Wenwen Shuai, Haijun Dou, Zhichen Guan, Wei Qian, Zhibao Li, Yinqun Hua, Jie Cai
Summary: This study synthesized (Y1-xLax)3Al5O12 (x = 0, 0.1, 0.2, 0.3) materials by doping lanthanum ions, and found that the doped materials exhibited improved mechanical properties and thermal expansion coefficient, as well as enhanced resistance to CMAS corrosion. These materials have potential applications.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Xianglei Liu, Jiahui Ding, Wanbo Hou, Xinhao Shi, Tao Feng, Xiangyuan Meng, Shifeng Wen, Mingde Tong, Zhufeng Yue
Summary: A composite coating was developed to improve the adhesion, wear resistance, and corrosion resistance, which exhibited significant enhancements in these properties.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Hongxuan Xing, Jidong Li, Xianwei Hu, Liang Tian, Renyun Zhang, Yiyong Wang
Summary: By depositing a Cu/Co-Mo corrosion-resistant plating layer on the surface of 6061 Al alloy, the bonding strength between the alloy and the plating layer can be improved and the corrosion resistance can be enhanced. The composite coating forms an obvious three-layer structure with Co-Mo coating exhibiting amorphous characteristics and Co3Mo phase composition. The composite coating improves the corrosion resistance and hardness of the substrate, effectively protecting the 6061 Al alloy.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Fan Yang, Debin Wang, Tianrun Li, Baijun Yang, Suode Zhang, Jianqiang Wang
Summary: The impact-corrosion behavior of monolayer and hierarchical Fe-based amorphous coatings fabricated by HVAF was investigated in 3.5 wt% NaCl solution. The monolayer coating exhibits corrosion failure with increased impact energy, while the hierarchical coating shows improved resistance. However, at high impact energies, both coatings experience corrosion degradation.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Shoaib Ahmad, Muddasir Nawaz, Solaiman Mohammad, R. A. Shakoor, Ramazan Kahraman, Talal Mohammed Al Tahtamouni
Summary: This research presents a novel self-healing anti-corrosion composite coating that demonstrates higher inhibition efficiency and self-healing effect, providing protection for metallic structures against corrosive environments.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Hui-Wen Peng, Chun-Hway Hsueh
Summary: A series of (CoCrNi)100-x-ySixNdy medium entropy alloy films with manipulated metalloid element, Si, and rare earth element, Nd, were synthesized using magnetron three-target co-sputtering. The films showed different structures and mechanical properties with varying Si and Nd contents. The optimized mechanical properties were observed in the film with Si0.61Nd5.14, attributed to precipitation strengthening and grain refinement.
SURFACE & COATINGS TECHNOLOGY
(2024)