18Cr-3Mn-1Ni-0.22N节镍型双相不锈钢热压缩再结晶行为研究

doi:10.11896/cldb.20070295

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Abstract Aphysical simulation method was used to study the hot compression behavior of 18Cr-3Mn-1Ni-0.22N low nickel type duplex stainless steel (DSS) in the deformation conditions of 1 123—1 423 K/0.01—10 s^-1 with deformation amount of 70%. The flow curves of stainless steel exhibited the occurrence of deformation softening and secondary hardening in the deformation conditions of 1 223—1 423 K/0.01—1 s^-1, and the extent of secondary hardening slowed down with strain rate increases to 10 s^-1. The deformation microstructure evolution of dynamic recrystallization (DRX) was mainly affected by deformation temperature and strain ratio, which mainly occurred on ferrite phase deformed at 1 123 K/0.01—10 s^-1, while on austenite phase deformed at 1 323 K/0.01—10 s^-1. The maximum effect of dynamic softening was achieved deformed at 1 123 K, and then the stress decreased rapidly with increasing temperature to 1 223 K under strain rates of 0.01—10 s^-1. The worst softening degree for the specimens deformed at 1 s^-1 was obtained under different deformation temperatures, and the best softening degree was achieved when the deformation conditions were at 0.1 s^-1 and greater than 1 223 K. The critical strains of DRX tend to increase first and then decrease with increasing temperature as the strain rate is constant. The 3D hot processing diagrams of power dissipation coefficient (η) and instability factor (ξ) with true strain of 0.2—1.2 were established. With the increase of strain, the zones with η>0.3 gradually expand from 1 300—1 400 K/0.01 s^-1 to 1 300—1 400 K/10 s^-1, and the safe hot working areas with ξ> 0 is concentrated in the high temperature ranges. The optimum parameters of hot working are in the deformation conditions of T=1 280—1 423 K and ε·=0.033—0.326 s^-1, and the corresponding values of η=0.39—0.44.

Key words： low nickel type duplex stainless steel strain hardening rate dynamic recrystallization critical strain 3D hot processing map

Published: 30 September 2021

CLC number:	TG142.71
	TG161

Fund:This work was financially supported by the National Natural Science Foundation of China(51461024, 51861019).

About author:: Zeyao Zeng, master of engineering, School of Mate-rials Science and Engineering, Kunming University of Technology, focusing on the research of hot deformation direction of duplex stainless steel.

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	ZENG Zeyao
	YANG Yinhui
	CAO Jianchun
	NI Ke
	PAN Xiaoyu

Cite this article:

ZENG Zeyao,YANG Yinhui,CAO Jianchun, et al. Study on the Hot Compression Recrystallization Behavior of 18Cr-3Mn-1Ni-0.22N Low Nickel Type Duplex Stainless Steel[J]. Materials Reports, 2021, 35(18): 18163-18169.

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http://www.mater-rep.com/EN/10.11896/cldb.20070295 OR http://www.mater-rep.com/EN/Y2021/V35/I18/18163

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