Hot Deformation Behavior and Microstructue Evolution of Super Austenitic Stainless Steel 24Cr-22Ni-7Mo-0.4N

doi:10.11901/1005.3093.2022.311

Chinese Journal of Materials Research

2023, Vol. 37

Issue (9): 655-667 DOI: 10.11901/1005.3093.2022.311

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Hot Deformation Behavior and Microstructue Evolution of Super Austenitic Stainless Steel 24Cr-22Ni-7Mo-0.4N

ZHAO Zhengxiang¹, LIAO Luhai¹, XU Fanghong², ZHANG Wei², LI Jingyuan¹(

)

^1.Beijing Advanced Innovation Center for Materials Genome Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
^2.State Key Laboratory of Advanced Stainless Steel Materials, Taiyuan Iron and Steel (Group) Co., Ltd., Taiyuan 030003, China

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ZHAO Zhengxiang, LIAO Luhai, XU Fanghong, ZHANG Wei, LI Jingyuan. Hot Deformation Behavior and Microstructue Evolution of Super Austenitic Stainless Steel 24Cr-22Ni-7Mo-0.4N. Chinese Journal of Materials Research, 2023, 37(9): 655-667.

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Abstract

Hot deformation behavior and microstructure evolution of super austenitic stainless steel 24Cr-22Ni-7Mo-0.4N were studied by uniaxial compression tests at temperatures from 1123 K to 1473 K under strain rates of 0.001~10 s^-1 up to the true strain of 0.8. The deformation parameters were modeled by Arrhenius equation and Zener-Hollomon parameter (Z). The peak stress and critical stress for dynamic recrystallization was found to exhibit a linear relationship with ln(Z/A), the thermal deformation activation energy of the steel was 497.11 kJ/mol. Based on the dynamic material model, the processing maps under different plastic strains were established. Electron backscatter diffraction (EBSD) was used to characterize the microstructure of the steel under different deformation conditions. The softening mechanism of the steel under most deformation conditions is discontinuous dynamic recrystallization (DDRX). Based on the analysis of microstructure and processing map, the optimum processing domain for hot deformation is identified as the deformation temperature of 1150~1200℃ and strain rate of 0.1~1 s^-1.

Key words: metallic materials super austenitic stainless steel hot deformation microstructure processing map dynamic recrystallization

Received: 02 June 2022

ZTFLH:

TG142.1

Fund: National Natural Science Foundation of China(U1806220);Science and Technology Major Project of Shanxi Province(20191102006)

Corresponding Authors: LI Jingyuan, Tel: (010)82376939, E-mail: lijy@ustb.edu.cn

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	ZHAO Zhengxiang
	LIAO Luhai
	XU Fanghong
	ZHANG Wei
	LI Jingyuan

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https://www.cjmr.org/EN/10.11901/1005.3093.2022.311 OR https://www.cjmr.org/EN/Y2023/V37/I9/655

Table 1 Chemical composition of super austenitic stainless steel 24Cr-22Ni-7Mo-0.4N (%,mass fraction)

Fig.1 Original structure in super austenitic stainless steel 24Cr-22Ni-7Mo-0.4N

Fig.2 Flow curves of super austenitic stainless steel 24Cr-22Ni-7Mo-0.4N deformed at different temperatures and strain rates (a) 0.001 s^-1; (b) 0.01 s^-1; (c) 0.1 s^-1; (d) 1 s^-1; (e) 10 s^-1

Fig.3 Variation of the work hardening rate ( $θ = ∂ σ ∂ ε T, ε ˙$ ) with stress at strain rate of (a) 10 s^-1 and (b) 10 s^-1 in super austenitic stainless steel 24Cr-22Ni-7Mo-0.4N

Fig.4 Variation of (-∂θ/∂σ) with respect to stress (MPa) at different temperatures and strain rate (a) 1 s^-1 and (b) 10 s^-1

Fig.5 Variation of lnsinh(ασp) withthe strain rate at different temperature (a), the temperature at different strain rate (b) (c) logarithm of the Z-parameter and

Fig.6 Variation of peak stress (σ_p) (a), critical stress (σ_c) (b), peak strain (ε_p) (c) and critical strain (ε_c) with ln(Z/A) (d)

Fig.7 Processing map of super austenitic stainless steel corresponding to plastic strains of 0.3 (a), 0.4(b), 0.5 (c) and 0.6(d) and the processing map is divided into 6 different domains for microstructural analysis (d)

Fig.8 IPF map corresponding to different conditions (a) 950℃, 0.001 s^-1; (b) 950℃, 10 s^-1; (c) 1050℃, 0.1 s^-1; (d) 1050℃, 0.001 s^-1; (e) 1200℃, 10 s^-1; (f) 1200℃, 0.001 s^-1; (g) 1200℃, 1 s^-1; (h) 1200℃, 0.1 s^-1

Fig.9 Microstructures of super austenitic stainless steel corresponding to different conditions (a) 950℃, 0.001 s^-1; (b) 1000℃, 0.01 s^-1; (c) 950℃, 0.1s^-1; (d) 1050℃, 0.001 s^-1

Fig.10 GOS distributions of DRX grains and grain boundary misorientation distribution plot in the samples deformed at 950℃ (a, c), 0.001 s^-1 and 950℃, 10 s^-1 (b, d)

Fig.11 IPF map and twinning boundaries distribution maps of samples deformed at 950℃, 0.001 s^-1 (a, c) and 950℃, 10 s^-1 (b, d)

Fig.12 Misorientation development corresponding to the designated white lines in Fig.11

Fig.13 Adiabatic temperature rise at different deformation conditions

Fig.14 Cracking of σ phase in super austenitic stainless steel samples deformed at 1200℃, 10 s^-1

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