Article
Metallurgy & Metallurgical Engineering
R. Bakhtiari, H. Nikukar, M. Divandari, E. Biro
Summary: Friction stir processing (FSP) is used to modify the microstructure of TLP joints made of 304 stainless steel, eliminating defects and improving mechanical properties. FSP eliminates the visible TLP bond line and refines the microstructure through dynamic recrystallization. It also improves the distribution and morphology of eutectic phases, increases joint strength, and reduces the presence of defects at the TLP bond line.
WELDING IN THE WORLD
(2023)
Article
Chemistry, Physical
Marek Szewczyk, Krzysztof Szwajka, Tomasz Trzepiecinski
Summary: Friction is a significant technological phenomenon that greatly affects the flow characteristics of deformed materials. In this study, a strip drawing friction test was conducted to evaluate the friction characteristics of DC04 steel sheets during sheet forming. The results showed that the effectiveness of lubrication depends on the viscosity of the lubricant and the pressure applied.
Article
Engineering, Mechanical
Di Pan, Guangqing Zhang, Hui Wu, Fanghui Jia, Lianjie Li, Tao Zhang, Ming Yang, Zhengyi Jiang
Summary: In this study, micro deep drawing experiments were conducted on an austenitic stainless steel using lubricants containing different mass fractions of graphene nanosheets (GNS) in ethanol. The friction-reduction mechanisms of the GNS in the micro deep drawing process were discussed by analyzing the profile and surface roughness of the microcups. The results showed that GNS could reduce friction and improve surface quality, with the lubricant containing 10 mg/ml GNS achieving the best results in terms of drawing force, wrinkling, and surface roughness.
Article
Materials Science, Multidisciplinary
Y. X. Liu, Z. Y. Liang, S. G. Xu, M. X. Huang
Summary: This study investigates the size effect on mechanical properties and microstructural evolution of an ultra-thin 304L stainless steel sheet with less than 20 grains through the thickness. It is found that the surface grains exhibit weaker strain hardening compared to the interior grains due to enhanced annihilation of statistically stored dislocations. The finite element analysis shows good agreement with experimental results.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Chemistry, Physical
Fei Wu, Yihao Hong, Zhengrong Zhang, Chun Huang, Zhenrong Huang
Summary: Accurate prediction of springback in deep-drawing of anisotropic stainless steel sheets is becoming more important. The anisotropy of sheet thickness direction plays a crucial role in predicting springback and final shape. Numerical simulation and experiments investigated the effect of Lankford coefficients (r(00), r(45), r(90)) at different angles on springback. The results show that each Lankford coefficient has a different impact on springback.
Article
Materials Science, Multidisciplinary
Wu Min, Li Guoping, Wang Lixin, Hou Lifeng, Wei Yinghui
Summary: Two different precipitation mechanisms of intragranular chi phase in super duplex stainless steel were investigated at different aging temperatures, with lenticular chi phase nucleating homogeneously within ferrite grains at 650 degrees C and Cr2N providing heterogeneous nucleation sites for granular chi phase at 800 degrees C. The driving force for nucleation at different temperatures was responsible for the observed differences in precipitation mechanisms.
Article
Engineering, Mechanical
Jingwei Zhao, Tao Wang, Fanghui Jia, Zhou Li, Cunlong Zhou, Qingxue Huang, Zhengyi Jiang
Summary: This study investigates the effects of annealing temperatures on the formability and quality of drawn cups using ASS 304 foils, finding optimal annealing temperatures to reduce wrinkling and improve cup quality. The non-optimized microstructure causing uneven compressive stress distribution is identified as a major factor in localized deformation and wrinkling during MDD.
CHINESE JOURNAL OF MECHANICAL ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Tsung-Chia Chen, Ching-Min Hsu, Cheng-Chi Wang
Summary: The study on deep drawing of thin sheets of stainless steel revealed the importance of considering the scale effect and successfully implemented finite element analysis to study the relationship between material behavior and stamping process.
Article
Chemistry, Physical
Di Pan, Guangqing Zhang, Fanghui Jia, Lianjie Li, Tao Zhang, Yao Lu, Hui Wu, Ming Yang, Zhengyi Jiang
Summary: In this paper, the effects of glycerol-based lubricant containing TiO2 NPs on micro deep drawing (MDD) of austenitic stainless steel (ASS) SUS301 were studied. The use of TiO2 nanolubricants significantly improved the quality of the drawn cups in terms of decreased wrinkling and surface roughness. The concentration of TiO2 NPs influenced lubricity by reducing friction during the MDD process, and the optimal concentration was found to be 2 wt%. The lubrication mechanisms were derived from the mending effects of TiO2 NPs and the formation of thin lubricant films associated with open and close lubricant pockets theory.
Article
Nanoscience & Nanotechnology
Xilin Xiong, Jun He, Huihui Zhi, Stoichko Antonov, Cheng Zhang, Yong Zhong, Yanjing Su
Summary: Annealing treatment below austenite start transformation temperature can improve the mechanical properties of martensitic stainless steel by stabilizing retained austenite and increasing its elongation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Seungchan Cho, Jihye Lee, Sangmin Shin, Donghyun Lee, Minsoo Kim, Hansang Kwon, Moonhee Choi, Yoon-Seok Lee, Ilguk Jo, Hyun-Uk Hong, Junghwan Kim
Summary: The high-temperature properties of TiC-reinforced SS matrix composite, fabricated through the infiltration process, were investigated. The addition of highly concentrated and closely adjacent TiC particulate reinforcement effectively suppressed the variations in CTE and thermal conductivity properties originating from the phase transformation of the SS matrix. Furthermore, the TiC addition significantly strengthened the SS, with the highest strengthening effect observed after the phase transformation. Therefore, TiC-SS composite shows great potential as advanced high-temperature-resistant structural materials.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Masayoshi Kumagai, Masatoshi Kuroda, Takashi Matsuno, Stefanus Harjo, Koichi Akita
Summary: This study investigated the stress response of austenitic stainless steel using neutron diffraction and found that there is stress sharing between austenite and martensite. The actual stress in the martensite is about half of the assumed stress and the phase stress in the austenite, and the martensite contains a large compressive residual stress.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Jingwei Zhao, Zhengyi Jiang, Zhihua Wang, Shengbo Sang, Leszek A. Dobrzanski, Ming Yang, Xiaoguang Ma, Yongzhen Wang
Summary: In this study, a numerical simulation model based on crystal plasticity theories was established to investigate the micro deep drawing process of ferritic stainless steel 430 foils. The results of the simulation matched well with experimental data, demonstrating the applicability of the model for analyzing the forming performance of the foils. The study revealed that annealing temperatures of 850 and 900 degrees Celsius are optimal for improving both the surface quality of the drawn cups and the formability of the foils. Thinning occurs significantly at the nose radius area, while the cup mouth area experiences the maximum thickness due to metal flow. Applying appropriate blank holding force during the micro deep drawing process can enhance the surface quality of the cups.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Hong Ma, Guoliang Qin, Zongyu Dang, Peihao Geng
Summary: This paper investigates the effect of steel surface roughness on the microstructure and mechanical properties of aluminium alloy/stainless steel inertia friction welded joints. It was found that high steel surface roughness can lead to unbonded areas in the interface, while polished steel can facilitate metallurgical reactions. Decreasing steel surface roughness results in improved joint strength.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Ehsan Norouzi, Reza Miresmaeili, Hamid Reza Shahverdi, Mohsen Askari-Paykani, Laura Maria Vergani
Summary: The effect of hydrogen on the phase transformation, deformation twins, and dislocation density of metastable stainless steel 304 was investigated. Hydrogen charging resulted in the formation of a large amount of alpha-martensite, a high density of deformation twins, and an increased dislocation density compared to the uncharged state. This caused a significant loss of ductility by 60% in the presence of hydrogen in metastable austenitic stainless steel. Alpha-martensite and twins were preferred sites for crack initiation and propagation, leading to increased susceptibility to hydrogen embrittlement.