Steel and Composite Structures

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Full-range plasticity of novel high-performance low-cost stainless steel QN1803

  • Zhou, Yiyi (Department of Structural Engineering, School of Civil Engineering and Architecture, Changzhou Institute of Technology) ;
  • Chouery, Kim Eng (Department of Disaster Mitigation for Structures, College of Civil Engineering, Tongji University) ;
  • Xie, Jiang-Yue (Department of Disaster Mitigation for Structures, College of Civil Engineering, Tongji University) ;
  • Shu, Zhan (Department of Structural Engineering, School of Civil Engineering and Architecture, Changzhou Institute of Technology) ;
  • Jia, Liang-Jiu (Department of Disaster Mitigation for Structures, College of Civil Engineering, Tongji University)
  • Received : 2020.02.15
  • Accepted : 2020.05.20
  • Published : 2020.06.25
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Abstract

This paper aims to investigate cyclic plasticity of a new type of high-performance austenitic stainless steel with both high strength and high ductility. The new stainless steel termed as QN1803 has high nitrogen and low nickel, which leads to reduction of cost ranging from 15% to 20%. Another virtue of the new material is its high initial yield strength and tensile strength. Its initial yield strength can be 40% to 50% higher than conventional stainless steel S30408. Elongation of QN1803 can also achieve approximately 50%, which is equivalent to the conventional one. QN1803 also has a corrosion resistance as good as that of S30408. In this paper, both experimental and numerical studies on the new material were conducted. Full-range true stress-true strain relationships under both monotonic and cyclic loading were obtained. A cyclic plasticity model based on the Chaboche model was developed, where a memory surface was newly added and the isotropic hardening rule was modified. A user-defined material subroutine was written, and the proposed cyclic plasticity model can well evaluate full-range hysteretic properties of the material under various loading histories.

Keywords

Acknowledgement

This study is supported by National Natural Science Foundation of China (51678082), and support from the Fundamental Research Funds for the Central Universities is also greatly appreciated. Thanks also goes to Tsingshan Holding Group for providing the stainless steel QN1803 and Qiangchao Machinery Factory for fabrication.

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