Hot deformation behaviors of AM355 stainless steel

doi:10.13251/j.issn.0254-6051.2020.03.011

Abstract

Abstract:

The isothermal hot compression test of as-forged AM355 stainless steel was conducted by Gleeble-3800 thermo-mechanical simulator in the strain rates range between 0.01-10 s^-1 and the temperatures range between 1173-1423 K. And microstructure after hot deformation was observed by means of OM, EBSD and TEM. The constitutive equations based on Arrhenius model as well as a modified equation with higher accuracy were established by the peak stresses obtained from the stress-strain curves under various conditions. The hot processing maps were constructed based on dynamic materials model (DMM). The hot working window at a strain of 0.9 was determined on the basis of processing map and deformed microstructure. The results show that, the optimum domain for hot forming of AM355 steel is determined in the temperature and strain rate ranges between 1250-1300 K, 0.01-0.03 s^-1 and 1300-1400 K, 0.01-10 s^-1 as well as 1400-1423 K, 0.5-10 s^-1 with the efficiency of endless than 0.36. It is found that the dynamic recrystallization (DRX) completed in this domain. Further, the relationship between austenite grain size of complete DRX (d_drx) and Zener-Holloman parameter (Z) is also given out.

Key words: AM355 steel, constitutive equation, processing map, microstructural analysis

CLC Number:

TG142.1

Hu Jiaqi, Wang Changjun, Yang Zhe, Liang Jianxiong, Dong Han. Hot deformation behaviors of AM355 stainless steel[J]. HTM, 2020, 45(3): 50-58.

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