Quantitative deformation measurements and analysis of the ferrite-austenite banded structure in a 2205 duplex stainless steel at 250℃

doi:10.1088/1674-1056/27/3/038102

Abstract The deformation process of the microstructure in 2205 duplex stainless steel (DSS) under thermo-mechanical coupling at 250℃ was investigated using digital image correlation (DIC). A thermal tension test of duplex stainless steel (2205DSS) with a banded structure was carried out to observe the initial deformation of the microstructure. It was found that inhomogeneous strain fields occurred primarily in austenite. The maximum normal strain in austenite was almost positive, while that in ferrite was almost negative. In addition, a thermal cyclic-loading test was conducted, and the strain field was characterized by e₁₁. Strain heterogeneities were induced after 400 cycles, which spread within the austenite and at the phase boundaries with the load increasing. The high tensile-strain regions were always located adjacent to regions of intense compressive strain. Based on the strain matrix sum vs. cycle number, we found that hardening occurred in the early cycles followed by softening.

Keywords: thermo-mechanical coupling duplex stainless steel digital image correlation (DIC)

Received: 05 September 2017
Revised: 23 December 2017
Accepted manuscript online:

PACS:	81.70.-q	(Methods of materials testing and analysis)
	81.70.Fy	(Nondestructive testing: optical methods)
	81.05.Bx	(Metals, semimetals, and alloys)
	81.40.Lm	(Deformation, plasticity, and creep)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11472187 and 11602166), the National Basic Research Program of China (Grant No. 2014CB046805), and the Natural Science Foundation of Tianjin, China (Grant No. 16JCYBJC40500).

Corresponding Authors: Ji-Hua Liu
E-mail: jhliu08lx@126.com

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Ji-Hua Liu(刘计划) Quantitative deformation measurements and analysis of the ferrite-austenite banded structure in a 2205 duplex stainless steel at 250℃ 2018 Chin. Phys. B 27 038102

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Quantitative deformation measurements and analysis of the ferrite-austenite banded structure in a 2205 duplex stainless steel at 250℃

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