Hot Workability of the as-Cast 21Cr Economical Duplex Stainless Steel Through Processing Map and Microstructural Studies Using Different Instability Criteria

doi:10.1007/s40195-017-0647-7

Abstract

Abstract:

To develop a fundamental understanding of the flow behavior and optimal hot workability parameters of this material, the hot workability and deformation mechanisms of the as-cast 21Cr EDSS were studied using processing map technology combined with microstructure analysis and isothermal hot compression over the temperature range of 1000-1150 °C and strain rate range of 0.01-10 s^-1. The processing maps and constitutive equation of peak stress were developed based on Prasad’s and Murty’s criteria. The results show that the processing maps exhibit a stable domain at 1000-1150 °C and 0.01-1 s^-1. The instability domain is exhibited at high strain rates (≥1 s^-1). This implies that Murty’s criterion can predict the unstable domain with high reliability. The detailed deformation mechanisms are also studied by microstructure observation, showing that the flow localization and microcracking are responsible for the flow instability.

Key words: Duplex stainless steel, Constitutive relationship, Processing map, Hot deformation behavior

Jing Han, Jia-Peng Sun, Ying Han, Huan Liu. Hot Workability of the as-Cast 21Cr Economical Duplex Stainless Steel Through Processing Map and Microstructural Studies Using Different Instability Criteria[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(11): 1080-1088.

Figures/Tables 9

Fig. 1 SEM image of the as-cast 21Cr EDSS before hot deformation

Fig. 2 True stress-true strain curves of the as-cast 21Cr EDSS under different deformation conditions: a 0.01 s-1, b 1150 °C

Fig. 3 Typical work hardening curves of the as-cast 21Cr EDSS under different deformation conditions: a 0.01 s-1, b 1150 °C

Fig. 4 Plots of a ln σ-ln ε?, b σ-ln ε?, and c ln[sinh(ασ)] - ln ε? at different temperatures

Fig. 5 Plots of a ln[sinh(ασ)]-10000/T and b lnZ-ln[sinh(ασ)] at different strain rates of peak stress

Fig. 6 Processing maps of the as-cast 21Cr EDSS at strains of 0.3 and 0.7 based on Prasad’s and Murty’s criteria: aε= 0.3, bε= 0.7

Fig. 7 Distribution of peak power dissipation efficiency with strain

Fig. 8 Optical deformed microstructures under different conditions: a 1050 °C, 0.01 s-1, b 1050 °C, 1 s-1, c 1150 °C, 0.1 s-1, d 1150 °C, 0.01 s-1. The inserts show the magnification of the positions highlighted by the yellow rectangle box

Fig. 9 Microstructure characteristics of the specimens deformed in the unstable domain: a 1050 °C, 10 s-1, b 1150 °C, 10 s-1, c TEM image of 1150 °C, 10 s-1

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