| Gradient Elastic–Plastic Properties of Expanded Austenite Layer in 316L Stainless Steel |
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| 摘 要： | The gradient mechanical properties, variation of stress with strain and surface cracking behavior of expanded austenite developed on 316L austenitic stainless steel were investigated by nanoindentation tests, X-ray residual stress analysis and scanning electron microscope observation in four-point bending tests. The results show that the plastic properties of the carburizing layer including true initial yield strengths and strain hardening exponents increase significantly from substrate to surface, while the true elastic modulus just improves slightly. Due to the onset of plastic flow, the residual stresses are almost equivalent to the true initial yield strengths from surface to the depth of ～10 lm. The results of four-point bending tests show that surface stress increases linearly with the increase in strain until the strain reaches～1.0%, after that the plastic yield happens. The expanded austenite surface layer is brittle, and the cracks will be created at the strain of ～1.4%.The cracking stress is about～2.4 GPa.
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| 收稿时间： | 2017-10-17 |
Gradient Elastic-Plastic Properties of Expanded Austenite Layer in 316L Stainless Steel |
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| Yong Jiang,Yang Li,Yun-Fei Jia,Xian-Cheng Zhang,Jian-Ming Gong. Gradient Elastic-Plastic Properties of Expanded Austenite Layer in 316L Stainless Steel[J]. Acta Metallurgica Sinica(English Letters), 2018, 31(8): 831. DOI: 10.1007/s40195-018-0710-z |
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| Authors: | Yong Jiang Yang Li Yun-Fei Jia Xian-Cheng Zhang Jian-Ming Gong |
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| Affiliation: | 1.School of Mechanical and Power Engineering Nanjing University of Technology Nanjing China2.Key Laboratory of Design and Manufacture of Extreme Pressure Equipment Nanjing China3.Key Laboratory of Pressure System and Safety, MOE, School of Mechanical and Power Engineering East China niversity of Science and Technology Shanghai China |
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| Abstract: | The gradient mechanical properties, variation of stress with strain and surface cracking behavior of expanded austenite developed on 316L austenitic stainless steel were investigated by nanoindentation tests, X-ray residual stress analysis and scanning electron microscope observation in four-point bending tests. The results show that the plastic properties of the carburizing layer including true initial yield strengths and strain hardening exponents increase significantly from substrate to surface, while the true elastic modulus just improves slightly. Due to the onset of plastic flow, the residual stresses are almost equivalent to the true initial yield strengths from surface to the depth of ~ 10 μm. The results of four-point bending tests show that surface stress increases linearly with the increase in strain until the strain reaches ~ 1.0%, after that the plastic yield happens. The expanded austenite surface layer is brittle, and the cracks will be created at the strain of ~ 1.4%. The cracking stress is about ~ 2.4 GPa. |
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| Keywords: | Low-temperature gaseous carburization Expanded austenite Nanoindentation Gradient elastic-plastic properties Four-point bending |
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