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Low-cycle fatigue behavior and life prediction of fine-grained 316LN austenitic stainless steel

Published online by Cambridge University Press:  20 November 2020

Zhe Zhang ,
An Li ,
Yanping Wang ,
Qiang Lin  and
Xu Chen
Zhe Zhang
Affiliation:
School of Chemical Engineering and Technology, Tianjin University, Tianjin300350, China
An Li
Affiliation:
School of Chemical Engineering and Technology, Tianjin University, Tianjin300350, China
Yanping Wang
Affiliation:
School of Chemical Engineering, Inner Mongolia Polytechnic University, Hohhot010051, China
Qiang Lin*
Affiliation:
School of Chemical Engineering and Technology, Tianjin University, Tianjin300350, China
Xu Chen
Affiliation:
School of Chemical Engineering and Technology, Tianjin University, Tianjin300350, China
*
a)Address all correspondence to this author. e-mail: linq@tju.edu.cn
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Abstract

Grain refinement has been applied to enhance the materials strength for miniaturization and lightweight design of nuclear equipment. It is critically important to investigate the low-cycle fatigue (LCF) properties of grain refined 316LN austenitic stainless steels for structural design and safety assessment. In the present work, a series of fine-grained (FG) 316LN steels were produced by thermo-mechanical processes. The LCF properties were studied under a fully reversed strain-controlled mode at room temperature. Results show that FG 316LN steels demonstrate good balance of high strength and high ductility. However, a slight loss of ductility in FG 316LN steel induces a significant deterioration of LCF life. The rapid energy dissipation in FG 316LN steels leads to the reduction of their LCF life. Dislocations develop rapidly in the first stage of cycles, which induces the initial cyclic hardening. The dislocations rearrange to form dislocations cell structure resulting in cyclic softening in the subsequent cyclic deformation. Strain-induced martensite transformation appears in FG 316LN stainless steels at high strain amplitude (Δε/2 = 0.8%), which leads to the secondary cyclic hardening. Moreover, a modified LCF life prediction model for grain refined metals predicts the LCF life of FG 316LN steels well.

Keywords

fatiguegrain sizelifecyclenuclear materialsscanning electron microscopy (SEM)
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 23-24 , 14 December 2020 , pp. 3180 - 3191
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Copyright
Copyright © The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press

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