新型含铝奥氏体耐热合金Fe-20Cr-30Ni-0.6Nb-2Al-Mo的动态再结晶行为<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.018.027

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Abstract Isothermal compression tests at a temperature of 950—1 100 ℃ and strain rates ranging from 0.01 to 1 s^-1 were performed on alumina-forming austenitic (AFA) alloy Fe-20Cr-30Ni-0.6Nb-2Al-Mo to reveal the hot deformation characteristics. The evolutions of microstructure and nucleation mechanisms of dynamic recrystallization (DRX) were analyzed combined with the technique of OM, EBSD and TEM. The regression method was adopted to determine the thermal deformation activation energy, apparent stress index, and to construct a thermal deformation constitutive model. The results show that the flow stress is strongly dependent on deformation temperature and strain rate, which increases with decreasing temperature and increasing strain rate. The DRX phenomenon occurred more easily at comparably higher deformation temperatures or lower strain rates. Based on the method for solving the inflection point via cubic polynomial fitting of lnθ-ε curves, the critical strain (ε_c) during DRX were precisely predicted. The nucleation mechanisms of DRX during thermal deformation mainly included the strain-induced grain boundary (GB) migration, grain fragmentation, and subgrain coalescence.

Key words： alumina-forming austenitic alloy flow stress constitutive equation dynamic recrystallization behavior nucleation mechanism

Published: 25 September 2017 Online: 2018-05-08

CLC number:

TG146.4

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	Articles by authors
	LUO Rui
	CHENG Xiaonong
	ZHENG Qi
	ZHU Jingjing
	WANG Jiao
	LIU Tian
	CHEN Guang
	YANG Qiao

Cite this article:

LUO Rui,CHENG Xiaonong,ZHENG Qi, et al. Dynamic Recrystallization Behavior of an Alumina-forming Austenitic Alloy Fe-20Cr-30Ni-0.6Nb-2Al-Mo[J]. Materials Reports, 2017, 31(18): 136-140.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.018.027 OR https://www.mater-rep.com/EN/Y2017/V31/I18/136

1 Viswanathan R, Bakker W. Materials for ultrasupercritical coal power plants-boiler materials: Part 1[J]. J Mater Eng Perform, 2001,10(1):81.
2 Yamamoto Y, Brady M P, Lu Z P, et al. Creep-resistant, Al₂O₃-forming austenitic stainless steels[J]. Science, 2007,316:433.
3 Yamamoto Y, Takeyama M, Lu Z P, et al. Alloying effects on creep and oxidation resistance of austenitic stainless steel alloys employing intermetallic precipitates[J]. Intermetallics, 2008,16:453.
4 Nie S H, Chen Y, Ren X, et al. Corrosion of alumina-forming austenitic steel Fe-20Ni-14Cr-3Al-0.6Nb-0.1Ti in supercritical water[J]. J Nucl Mater, 2010,399:231.
5 Bei H, Yamamoto Y, Brady M P, et al. Aging effects on the mechanical properties of alumina-forming austenitic stainless steels[J]. Mater Sci Eng A, 2010,527:2079.
6 Yamamoto Y, Muralidharan G, Brady M P. Development of L1₂-ordered Ni₃(Al,Ti)-strengthened alumina-forming austenitic stainless steel alloys[J]. Scr Mater, 2013,69:816.
7 Zhou Haitao, Liu Zhichao, Wen Shengfa, et al. Dynamic recrystallization behavior of GH625 superalloy during hot deformation[J]. Rare Metal Mater Eng, 2012,41(11):1917(in Chinese).
周海涛,刘志超,温盛发,等. GH625合金的动态再结晶行为研究[J]. 稀有金属材料与工程, 2012,41(11):1917.
8 Wei Hailian, Liu Guoquan, Xiao Xiang, et al. Apparent and physically based constitutive analyses for hot deformation of austenite in 35Mn2 steel[J]. Acta Metall Sin, 2013,49(6):731 (in Chinese).
魏海莲,刘国权,肖翔,等. 表观的和基于物理的35Mn钢奥氏体热变形本构分析[J]. 金属学报, 2013,49(6):731.
9 Ebrahimi G R, Keshmiri H, Momeni A, et al. Dynamic recrystallization behavior of a superaustenitic stainless steel containing 16%Cr and 25%Ni[J]. Mater Sci Eng A, 2011,528: 488.
10Ryan N D, McQueen H J. Flow stress, dynamic restoration, strain hardening and ductility in hot wording of 316 steel[J]. J Mater Processing Technol, 1990,21(2):177.
11Poliak E I, Jonas J J. Initiation of dynamic recrystallization in constant strain rate hot deformation[J]. ISIJ Int, 2003,43(5):684.
12Najafizadeh A, Jonas J J. Predicting the critical stress for initiation of dynamic recrystallization[J]. ISIJ Int, 2006,46(11):1679.
13Sellars C M, Mc Tegart W J. On the mechanism of hot deformation[J]. Acta Metall, 1966,14(9):1136.
14Slooff F A, Zhou J, Duszczyk J, et al. Constitutive analysis of wrought magnesium alloy Mg-Al4-Zn1[J]. Scr Mater, 2007,57:759.
15Lin Y C, Chen Mingsong, Zhong Jue. Constitutive modeling for elevated temperature flow behavior of 42CrMo steel[J]. Comput Mater Sci, 2008,42:470.
16Cao Yu, Di Hongshuang, Zhang Jiecen, et al. Research on dynamic recrystallization behavior of incology 800H[J]. Acta Metall Sin, 2012,48(10):1175(in Chinese).
曹宇,邸洪双,张洁岑,等. 800H合金动态再结晶行为研究[J]. 金属学报, 2012,48(10):1175.
17Cao Yu, Di Hongshuang, Ma Tianjun, et al. Hot deformation behavior of alloy 800H[J]. J Northeastern University: Nat Sci Ed, 2012,33(2):213(in Chinese).
曹宇,邸洪双,马天军,等. 800H合金热变形行为研究[J], 东北大学学报:自然科学版, 2012,33(2):213.