Strain rate and cold rolling dependence of tensile strength and ductility in high nitrogen nickel-free austenitic stainless steel

doi:10.1088/1674-1056/26/9/096104

Abstract The tensile strength and ductility of a high nitrogen nickel-free austenitic stainless steel with solution and cold rolling treatment were investigated by performing tensile tests at different strain rates and at room temperature. The tensile tests demonstrated that this steel exhibits a significant strain rate and cold rolling dependence of the tensile strength and ductility. With the increase of the strain rate from 10^-4 s^-1 to 1 s^-1, the yield strength and ultimate tensile strength increase and the uniform elongation and total elongation decrease. The analysis of the double logarithmic stress-strain curves showed that this steel exhibits a two-stage strain hardening behavior, which can be well examined and analyzed by using the Ludwigson equation. The strain hardening exponents at low and high strain regions (n₂ and n₁) and the transition strain (ε_L) decrease with increasing strain rate and the increase of cold rolling RA. Based on the analysis results of the stress-strain curves, the transmission electron microscopy characterization of the microstructure and the scanning electron microscopy observation of the deformation surfaces, the significant strain rate and cold rolling dependence of the strength and ductility of this steel were discussed and connected with the variation in the work hardening and dislocation activity with strain rate and cold rolling.

Keywords: high nitrogen nickel-free austenitic stainless steel cold rolling Ludwigson equation tensile strength and ductility

Received: 22 May 2017
Revised: 07 July 2017
Accepted manuscript online:

PACS:	61.82.Bg	(Metals and alloys)
	81.40.Ef	(Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization)
	81.70.-q	(Methods of materials testing and analysis)
	62.20.-x	(Mechanical properties of solids)

Fund: Project supported by the National Natural Science Foundations of China (Grant Nos. 51371089 and 51401083).

Corresponding Authors: Zhong-Hao Jiang, Wen-Quan Wang
E-mail: jzh@jlu.edu.cn;wwq@jlu.edu.cn

Cite this article:

Gui-Xun Sun(孙贵训), Yue Jiang(江月), Xiao-Ru Zhang(张晓茹), Shi-Cheng Sun(孙世成), Zhong-Hao Jiang(江忠浩), Wen-Quan Wang(王文权), Jian-She Lian(连建设) Strain rate and cold rolling dependence of tensile strength and ductility in high nitrogen nickel-free austenitic stainless steel 2017 Chin. Phys. B 26 096104

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Strain rate and cold rolling dependence of tensile strength and ductility in high nitrogen nickel-free austenitic stainless steel

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