Influence of dynamic strain aging pre-treatment on creep-fatigue behavior in 316L stainless steel |
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| Authors: | Huifeng Jiang Xuedong Chen Zhichao Fan Jie Dong Heng Jiang Shouxiang Lu |
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| Affiliation: | aNational Technology Research Center on Pressure Vessel and Pipeline Safety Engineering, Hefei General Machinery Research Institute, Hefei 230031, PR China;bDepartment of Safety Science and Engineering, University of Science and Technology of China, Hefei 230027, PR China |
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| Abstract: | Stress controlled creep-fatigue tests were carried out for hot rolled and dynamic strain aging pre-treated 316L stainless steel different loading levels at 550 °C. For both pre-treatment state materials, dynamic strain aging was found to manifest itself macroscopically as displacement or mean strain abrupt jumps during cyclic deformation. Comparing with hot rolled material, by DSA pre-treatment, the creep-fatigue cyclic strain amplitude is decreased, the cycle at the 1st abrupt displacement jump is postponed and the material creep-fatigue life is effectively prolonged. Moreover, it is found that, the material creep-fatigue life monotonically increases with pre-deformation strain, no matter the maximum pre-deformation stress is larger than the maximum creep-fatigue applied stress or not. |
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| Keywords: | Creep-fatigue Dynamic strain aging Stress control Stainless steel High temperature |
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