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中南大学学报(英文版)

Journal of Central South University

Vol. 23    No. 7    July 2016

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Processing maps and hot working mechanisms of supercritical martensitic stainless steel
WANG Meng-han(王梦寒), WANG Rui(王瑞), MENG Lie(孟烈), WANG Gen-tian(王根田)

College of Material Science and Engineering, Chongqing University, Chongqing 400044, China

Abstract:The hot working mechanism of 2Cr11Mo1VNbN steel was investigated by means of compression tests at temperatures of 900-1150 °C and strain rates of 0.005-5 s-1. At strains of 0.2, 0.3, 0.5 and 0.7, the relationship among strain rate sensitivity, power dissipation efficiency and instability parameter under different conditions were studied. Power dissipation maps and instability maps at different strains were established. The optimal and the instable deformation regimes were established by the processing maps based on the dynamic material model. The processing maps were developed for the typical strains of 0.2, 0.3, 0.5 and 0.7, predicting the instability regions occurring at high strain rate more than 0.05 s-1, which should be avoided during hot deformation. The optimized processing parameters for hot working of 2Cr11Mo1VNbN supercritical stainless steel were temperatures of 1080- 1120 °C and strain rates of 0.005-0.01 s-1.

 

Key words: martensitic stainless steel; processing map; strain-rate sensitivity; hot deformation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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