铬钼高温铁素体钢的形变特性与动态再结晶模型

doi:10.11896/cldb.19060104

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Abstract Advanced Gleeble thermal simulation technology was used to carry out the hot compression tests of Cr-Mo high temperature ferritic steel 12CrMoG at 950—1 150 ℃ and 0.001—10 s^-1. The deformation characteristics and dynamic recrystallization behaviour of the steel were systematically studied. The experimental results show that the flow curves have an obvious trend of dynamic recrystallization at high temperature and low strain rate; the constitutive model with strain of 0.2 was constructed, and the activation energy of hot deformation is 384.54 kJ·mol^-1, which indicates that 12CrMoG steel has excellent hot working performance; the hot processing maps at different strains were constructed. Combining the microstructure analysis, the flow instability zone of hot deformation was avoided and the optimum hot working windows under different strains were defined. The critical dynamic recrystallization model and volume fraction model were constructed based on the Avrami equation. The linear relationship between critical stress and peak stress was determined, and the dynamic recrystallization behaviour during high temperature deformation was predicted. This study provides scientific guidance for practical hot working process and engineering application of 12CrMoG high temperature ferrite steel.

Key words： 12CrMoG steel constitutive model processing map deformation microstructure dynamic recrystallization

Published: 06 November 2020

CLC number:

TG142.1

Fund:General Program of Natural Science Research in Colleges and Universities of Jiangsu Province (19KJB430001), Key R & D Plan of Jiangsu Province (Industry Prospect and Common key Technology) (BE2017127), China Postdoctoral Science Foundation (2019M661738), National Natural Science Foundation of China (51771082).

About author:: Rui Luograduated from Jiangsu University in December 2016 with a doctorate in engineering. From November 2018 to February 2019, he visited the Institute of Metal Materials of Tohoku University, Japan. He is now a graduate tutor at Jiangsu University and he’s mainly engaged in the research of hot processing pro-perties of high-end metal structural materials.

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	Articles by authors
	LUO Rui
	CHEN Leli
	CAO Yun
	ZHOU Haotian
	CUI Shugang
	HAN Min
	PEI Changlei
	CHENG Xiaonong
	GAO Pei

Cite this article:

LUO Rui,CHEN Leli,CAO Yun, et al. Deformation Characteristics and Dynamic Recrystallization Model of Cr-Mo High Temperature Ferritic Steel[J]. Materials Reports, 2020, 34(20): 20118-20122.

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http://www.mater-rep.com/EN/10.11896/cldb.19060104 OR http://www.mater-rep.com/EN/Y2020/V34/I20/20118

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