Dynamic Recrystallization Behavior and Kinetics Model of a New Developed Austenitic Heat Resistant Steel CHDG-A

doi:10.11901/1005.3093.2019.567

Chinese Journal of Materials Research

2020, Vol. 34

Issue (8): 611-620 DOI: 10.11901/1005.3093.2019.567

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Dynamic Recrystallization Behavior and Kinetics Model of a New Developed Austenitic Heat Resistant Steel CHDG-A

CHENG Xiaonong¹, GUI Xiang¹, LUO Rui¹(

), XU Guifang¹, YUAN Zhizhong¹, ZHOU Yuseng¹, GAO Pei¹^,²

1 School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China
2 Jiangsu Yinhuan Precision Steel Tube Co. , Ltd. , Yixing 214203, China

Cite this article:

CHENG Xiaonong, GUI Xiang, LUO Rui, XU Guifang, YUAN Zhizhong, ZHOU Yuseng, GAO Pei. Dynamic Recrystallization Behavior and Kinetics Model of a New Developed Austenitic Heat Resistant Steel CHDG-A. Chinese Journal of Materials Research, 2020, 34(8): 611-620.

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Abstract

The deformation behavior and microstructural evolution of a new developed austenitic heat resistant steel CHDG-A were investigated by hot compression tests with strain rate in the range of 0.01-10 s^-1 at 900~1100℃. The results show that either increasing the deformation temperature or decreasing the strain rate, the flow stress level reduces remarkably. Accurate constitutive equations were established between peak stress and deformation parameters, i.e., temperature and strain rate by the regression analysis of sine hyperbolic function. The hot deformation activation energy of CHDG-A was calculated to be 515.618 kJ/mol. From the deformed microstructures it is found that dynamic recrystallization (DRX) is the principal softening mechanism during hot working. The DRX process may initiate from nucleus formed at bulging out of grain-boundaries, which can be promoted by the increase of temperature and the decrease of strain rate. The values of peak stress, critical stress, peak strain and critical strain for DRX were determined from the true strain-true stress curves and their equations related to the Zener-Hollomon parameter were obtained. The critical strain and corresponding stress for DRX can be expressed through the parameter Z. The critical ratios of ε_c/ε_p and σ_c/σ_p are also identified, which are 0.52 and 0.98, respectively. Moreover, the DRX kinetics for CHDG-A can be represented in the form of Avrami equation, and the predicted volume fraction of new grains based on the developed model agrees well with the experimental results.

Key words: metallic materials austenitic heat resistant steel hot compression Zener-Hollomon parameter dynamic recrystallization

Received: 05 December 2019

ZTFLH:

TG142.71

Fund: Natural Science Foundation of the Higher Education Institutions of Jiangsu Province, China(19KJB430001);Key R & D Program of Jiangsu Province (industry prospect and common key technology)(BE2017127)

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	Xiaonong CHENG
	Xiang GUI
	Rui LUO
	Guifang XU
	Zhizhong YUAN
	Yuseng ZHOU
	Pei GAO

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.567 OR https://www.cjmr.org/EN/Y2020/V34/I8/611

Table1 Chemical compositions of CHDG-A(5) (%, mass fraction)

Fig.1 True stress-strain curves of CHDG-A under different strain rates and temperatures: (a) 0.01 s^-1, (b) 0.1 s^-1, (c) 1 s^-1, (d) 10 s^-1

Fig.2 Comparisons between experimental and calculated σ_p

Fig.3 Work hardening rate versus strain of CHDG-A (T=950℃, $ε ˙$ =0.1 s^-1)

Fig.4 Three order polynomials equation of work hardening rate versus flow stress of CHDG-A: (a) T=1000℃, (b) $ε ˙$ =0.1 s^-1

Fig.5 Relationships between the parameter, Z and ε_c (a) and Relationships between σ_c, ε_p and σ_p (b)

Fig.6 Linear relationship between ln[-ln(1-X_DRX)] and ln[(ε-ε_c)/ε_p] under different deformation conditions

Fig.7 Calculated consequence of dynamic recrystallization volume of isothermal compressed CHDG-A: (a) T=1100℃; (b) $ε ˙$ = 0.01 s^-1

Fig.8 Comparison of calculated X_DRXwith experimental X_DRX during isothermal compression of CHDG-A: (a) $T$ =1000℃, $ε ˙$ = 0.01 s^-1(b) $T$ =1100℃, $ε ˙$ =0.1 s^-1

Fig.9 Microstructures of CHDG-A deformed at 1050℃, 0.1 s^-1 with different strain: (a) ε=0.1, (b) ε=0.4, (c) ε=0.8

Fig.10 Microstructures of CHDG-A deformed at 0.1 s^-1 under different deformation temperature: (a) T=950℃, (b) T=1050℃, (c) T=1100℃

Fig.11 Microstructures of CHDG-A deformed at 1050℃ with different strain rate: (a) $ε ˙ =$ 1 s^-1, (b) $ε ˙ =$ 0.5 s^-1, (c) $? ε ˙ =$ 0.1 s^-1, (d) $ε ˙ =$ 0.01 s^-1

Fig.12 Microstructural of CHDG-A at T=900℃, $? ε ˙ =$ 1 s^-1 (a) Kikuchi pattern quality maps (BC) of CHDG-A, (b) inverse pole figure (IPF) of CHDG-A (the white, yellow, black and red lines represent grain boundaries with misorientation angles (θ): <10°, 10~15° (subboundaries), >15° and twin boundaries, respectively)

Fig.13 Microstructural of CHDG-A at T=1050℃, $ε ˙ =$ 0.01 s^-1 (a) BC of CHDG-A, (b) IPF of CHDG-A (the white, yellow, black and red lines represent grain boundaries with θ<10°, 10°≤θ≤15°, θ>15° and twin boundaries, respectively; arrows in Fig.13a indicate the nucleation sites)

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