| NUCLEAR MATERIALS |
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| Constitutive Equation and Dynamic Recrystallization Behavior of 316L Austenitic Stainless Steel for Nuclear Power Equipment |
| CHENG Xiaonong, GUI Xiang, LUO Rui, YANG Yutong, CHEN Leli, WANG Wei, WANG Wen
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| School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013 |
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Abstract The hot deformation behavior of 316L austenitic stainless steel used in nuclear power equipment was studied by hot compression tests in the temperature range of 900—1 100 ℃, and in the strain rate range of 0.01—5 s-1. According to the data of hot compressive experiment, the flow stress curves of 316L under different deformation conditions were plotted. The constitutive model considering the compensation of strain for predicting the flow stress of 316L under all test conditions was developed on the basis of Arrhenius-type equation. The microstructural evolution of 316L during deformation was observed via an optical microscope. The critical strain of dynamic recrystallization of 316L stainless steel is identified based on the work hardening rate versus flow stress curves. The DRX kinetics for 316L can be represented in the form of Avrami equation. The results show that either decreasing deformation temperature or increasing strain rate makes the flow stress level reduce remarkably. The accuracy of the developed model was evaluated using standard statistical parameters such as correlation coefficient and average absolute relative error. It suggested that this developed constitutive equation could accurately predict high temperature flow behaviors of 316L. It is found that the DRX mainly occurred at high strain rates and high temperatures. The DRX volume fraction increased towards 1.0 with an increase in strain in terms of the S-shape and the predicted volume fraction of new grains based on the developed model agrees well with the experimental results.
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Published: 21 May 2019
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| Fund:This work was financially supported by the National High Technology Research and Development Program of China(2012AA03A501). |
About author:: Xiaonong Cheng, a doctoral supervisor, has served as the vice president of Jiangsu University and concurrently the leader of Jiangsu Province’s dominant disciplines. He has long been engaged in teaching and research in the field of materials science and engineering, and has trained nearly 50 graduate students. A lot of scientific research work has been carried out around the research, development, application of new metal materials and reliable and advanced material processing technology. The main research direction is the design of new materials with high perfor-mance and the surface strengthening and functionalization of materials. He has published more than 100 papers in academic journals such as Journal of
Mechanical Engineering, Acta Metallurgica Sinica and Materials Science and Engineering. Professor Cheng has been rated as an outstanding scientific and technical worker, an outstanding mid-aged expert, and a vice chairman of the Jiangsu Metallurgical Association and the Institute of Metals. |
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2019, Vol. 33 
