High Temperature Plastic Deformation Behavior and Hot Workability of an Alumina-forming Austenitic Heat-resisting Alloy

doi:10.11901/1005.3093.2018.432

Chinese Journal of Materials Research

2019, Vol. 33

Issue (3): 232-240 DOI: 10.11901/1005.3093.2018.432

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High Temperature Plastic Deformation Behavior and Hot Workability of an Alumina-forming Austenitic Heat-resisting Alloy

Yutong YANG,Rui LUO(

),Xiaonong CHENG,Xiang GUI,Leli CHEN,Wei WANG,Qi ZHENG

School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China

Cite this article:

Yutong YANG,Rui LUO,Xiaonong CHENG,Xiang GUI,Leli CHEN,Wei WANG,Qi ZHENG. High Temperature Plastic Deformation Behavior and Hot Workability of an Alumina-forming Austenitic Heat-resisting Alloy. Chinese Journal of Materials Research, 2019, 33(3): 232-240.

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Abstract

The deformation behavior of a new alumina-forming austenitic stainless steel (AFA) was investigated by means of isothermal hot compression test with a strain rate range of 0.01~5 s^-1 at 950~1150℃, as well as OM and EBSD characterization. The hot processing map of the AFA steel was established based on dynamic material model. The influence of deformation parameters on the processability of the steel was also analyzed. Besides, the thermal deformation mechanism diagram was also constructed according to the deformation characteristics of different regions. The results show that the high temperature flow stress of the new AFA steel is significantly affected by the deformation temperature and strain rate. Serious flow instability can be observed at 950~1150℃ with strain rates of 0.18~5 s^-1. Fully dynamic recrystallization occurred under the deformation conditions of 1050~1120℃ and 0.01~0.1 s^-1 or 1120~1150℃ and 10^-0.5~10^-1.5 s^-1. The recrystallized grains are fine and homogeneous with the power dissipation factor η reaching the peak value of 45%. It is proposed that the recrystallization zone should be preferentially selected and the flow instability zone should be avoided in order to establish a reasonable hot processing system.

Key words: metallic materials Austenitic heat-resisting alloy hot deformation dynamic recrystallization deformation mechanism

Received: 03 July 2018

ZTFLH:

TG142.73

Fund: Supported by National High-tech R & D Program (863 Program)(2012AA03A501);Jiangsu Province's Graduate Research Innovation Plan for 2014(KYLY-1027)

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	Yutong YANG
	Rui LUO
	Xiaonong CHENG
	Xiang GUI
	Leli CHEN
	Wei WANG
	Qi ZHENG

URL:

https://www.cjmr.org/EN/10.11901/1005.3093.2018.432 OR https://www.cjmr.org/EN/Y2019/V33/I3/232

Table 1 Chemical Composition of experimental steel (mass fraction, %)

Fig.1 Flow stress curves of AFA alloy obtained at different temperatures with strain rate of 0.1 s^-1 (a) and at 1050℃ with different strain rates (b)

Fig.2 EBSD grain orientation maps of AFA alloy with strain of 0.8 and strain rate of 0.01 s^-1 at: (a) 950℃, (b) 1000℃, (c) 1100℃

Fig.3 EBSD grain orientation maps of AFA alloy at strain of 0.8 with temperature of 1050℃ with strain rates of (a) 0.01 s^-1, (b) 0.1 s^-1 and (c) 10 s^-1

Fig.4 Processing maps obtained on AFA alloy at the strain of 0.3 (a), 0.4 (b), 0.5 (c) and 0.6 (d) (the contours represent efficiency of power dissipation, shadow represent flow instability area)

Fig.5 Variation of η with the strain at deformation temperatures of 1000℃ (a), 1050℃ (b), 1100℃ (c) and 1150℃ (d) with different strain rates

Fig.6 Dynamic recrystallization microstructure of AFA alloy in peak η region: (a)1100℃ and 0.01 s^-1; (b) 1150℃ and 0.1 s^-1

Fig.7 Processing map of AFA alloy with the strain of 0.6

Fig.8 OM image of microstructure under the deformation condition of 950℃ and 5 s^-1

Fig.9 OM image of microstructures hot deformed at (a) 1150℃ and 5 s^-1, (b) 1150℃ and 0.01 s^-1

Fig.10 Instable microstructure of AFA alloy (a) 950℃、1 s^-1; (b) 1000℃、0.5 s^-1; (c) 1050℃、0.5 s^-1; (d) 1100℃、0.5 s^-1

Fig.11 OM image of microstructures hot deformed at (a) 950℃ and 0.01 s^-1, (b) 1000℃ and 0.1 s^-1

Fig.12 Hot deformation machanism diagram of AFA alloy

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