Article
Materials Science, Multidisciplinary
Pengjie Wang, Qiang Cao, Sheng Liu, Qing Peng
Summary: Femtosecond laser peening technique can increase surface hardness of stainless steel without decreasing surface roughness; Finite element analysis shows that this method does not lead to melting; Molecular dynamic simulations reveal the dislocation pinning mechanism during the peening process.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Multidisciplinary
M. V. Odnobokova, A. N. Belyakov, P. D. Dolzhenko, M. V. Kostina, R. O. Kaibyshev
Summary: The effect of microstructure and dispersion of secondary phases on the tensile mechanical properties of two high nitrogen austenitic stainless steels was investigated after annealing or rolling at 1000 degrees C. After annealing, solid solution strengthening was the main contributor to the overall strength. Rolling, on the other hand, increased the yield strength by almost twofold due to the increased dislocation density.
Article
Materials Science, Multidisciplinary
Hossein Eskandari Sabzi, Everth Hernandez-Nava, Xiao-Hui Li, Hanwei Fu, David San-Martin, Pedro E. J. Rivera-Diaz-del-Castillo
Summary: A new approach to modeling microstructure evolution and yield strength in laser powder bed fusion components was introduced, revealing the activation of various restoration mechanisms during the process. A mechanism for the formation of low-angle grain boundaries to enhance alloy strength was suggested, along with a validated equation based on subgrain size. The study quantitatively described the dependency of yield stress on process parameters and alloy composition.
MATERIALS & DESIGN
(2021)
Article
Nanoscience & Nanotechnology
Lucie Jacquet, Nicolas Meyer, Maximilien Libert, Frederic De Geuser, Muriel Braccini, Rafael Estevez, Marc Mantel
Summary: The mechanical brittleness of ferritic steels at temperatures close to ambient temperature is affected by precipitation and grain size. Six model microstructures with different elements additions and thermal treatments were developed to analyze the formation of precipitates and the behavior of interstitial elements in the ferritic matrix at a fine scale. The understanding of these microstructures is crucial for understanding the mechanical behavior of the alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Zhou Yan, Ke Zou, Manping Cheng, Zhipeng Zhou, Lijun Song
Summary: In this study, the evolution of trans-scale heterogeneous structures in austenitic stainless steels fabricated by Directed Energy Deposition (DED) was systematically investigated. The impact of these structures on yield strength was quantified, with dislocation intensity being the main contributor to strength, especially the GND type accounting for over 60% of total dislocations. Despite the presence of micro inclusions in DED steel, a synergistic effect between deformation twinning and pre-existing GND-induced back stress contributes to high tensile plasticity.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Review
Materials Science, Multidisciplinary
Zhiping Xiong, Ilana Timokhina, Elena Pereloma
Summary: Continuous innovations in design of advanced structural steels play a crucial role in the future progress of manufacturing, automotive and construction industries. Events at nano and atomic scales are essential in controlling steel strength, with strengths of 1-1.5 GPa realized in nano-scale precipitation strengthened steels. Modern characterization techniques allow for insight into mechanisms of solute atoms clustering, nano-precipitate formation, and interactions with dislocations contributing to strength.
PROGRESS IN MATERIALS SCIENCE
(2021)
Review
Materials Science, Multidisciplinary
Bingyang He, Juan Wang, Weipu Xu
Summary: This paper reviews the strengthening essence and phase-transformation mechanism of austenitic stainless steels at cryogenic temperatures, compares the mechanical properties and microstructure evolution under different conditions, and establishes constitutive models to predict the mechanical properties.
Article
Nanoscience & Nanotechnology
T. W. J. Kwok, K. M. Rahman, V. A. Vorontsov, D. Dye
Summary: This study investigated the effect of hot rolling temperature on the mechanical properties of a Fe-28Mn-8Al-1.0C steel. It was found that lower temperature rolling significantly increased the yield strength without compromising the elongation to failure. The improvement in strength was attributed to the increase in residual dislocation density, which was retained even after the ageing heat treatment. The homogeneous precipitation of kappa-carbides indicated that the high residual dislocation density did not adversely affect precipitation kinetics.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Jaeeun Lee, Hwangsun Kim, Kyeongjae Jeong, Seong-Jun Park, Joonoh Moon, Sung-gyu Kang, Heung Nam Han
Summary: Fe-Al-Mn-C steels exhibit superior mechanical properties, with the formation of nanoscale precipitates like κ-carbides significantly impacting their mechanical performance. Researchers conducted thermokinetic simulations to predict phase fraction and size of precipitates, evaluated precipitation strengthening models, and calculated total yield strength considering various strengthening mechanisms.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Hsuan-Han Lai, Hoyen Hsieh, Chen-Yen Kuo, Weite Wu
Summary: Solidification cracking is a critical failure mode for materials like magnesium, nickel, and stainless steel. Its nature can be studied through experiments or theoretical calculations. The cracking susceptibility index (CSI) has been proposed as a model for these calculations. This study examines the CSI of various stainless steel alloys and constructs CSI maps for referencing and comparison. The results match previous studies on cracking in austenitic steels.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Lin Wang, Chen Chen, Zhuoyuan Li, Zhuyu Wang, Bo Lv, Fucheng Zhang
Summary: The hot compression of a super austenitic stainless steel was conducted at different temperatures under various angles between the solidification direction of columnar crystals and loading direction, revealing significant effects on microstructural evolution. Different dynamic recrystallization mechanisms were observed at different temperatures and angles, indicating the importance of crystal orientation in the recrystallization process.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Mechanical
Y. Z. Li, Z. Y. Liang, M. X. Huang
Summary: This study investigates the effect of warm rolling on the deformation mechanisms of TWIP steel. It is found that while dislocation multiplication always controls the maximum flow stress, deformation twinning becomes increasingly important for steels with larger warm rolling reductions. The twinning kinetics is enhanced by the high dislocation densities caused by warm rolling, leading to an enhancement of twinning-induced hardening.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Optics
Lin Wang, Masoud Mohammadpour, Xiangdong Gao, Jean-Philippe Lavoie, Klaus Kleine, Fanrong Kong, Radovan Kovacevic
Summary: The adjustable ring mode (ARM) laser, combining annular and gaussian laser beams, shows promising potential for stabilizing laser-based welding processes. Experimental investigation of laser-material processing under different laser modes revealed varying effects on keyhole entrance characteristics and fusion efficiency. Plasma intensity was found to have a positive relationship with keyhole geometry in different shaped laser beam welding, impacting fusion efficiency across weld cross-sections.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Chemistry, Physical
Yongtao Bai, Hao Wang, Shuhong Wang, Yihui Huang, Yao Chen, Wenwu Zhang, Andreas Ostendorf, Xuhong Zhou
Summary: Nanosecond laser shock peening improves the life cycle performance of high-strength steel by inducing higher microhardness, corrosion resistance, and fatigue life through microstructures formation. Additionally, compressive residual stress can be found in the treated area to enhance the material properties.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Brian Bettes, Yi Xie, Ching-Heng Shiau, Cheng Sun
Summary: In this study, the chemical interactions between neodymium (Nd) and four types of stainless steels were investigated through out-of-pile diffusion couple testing. It was found that nickel was the most active element during the diffusion process and the kinetics of the chemical interactions were strongly dependent on the microstructure.
JOURNAL OF NUCLEAR MATERIALS
(2022)