Journal of Jilin University(Engineering and Technology Edition) ›› 2018, Vol. 48 ›› Issue (6): 1799-1805.doi: 10.13229/j.cnki.jdxbgxb20170619

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Hot deformation behavior of 9%Cr steel contained B and Co elements

GUAN Qing-feng1(),ZHANG Fu-tao1,PENG Tao1,LYU Peng1(),LI Yao-jun2,XU Liang2,DING Zuo-jun2   

  1. 1. Materials Science and Engineering,Jiangsu University, Zhenjiang 212013,China
    2. Wuxi Parker New Materials Technology Co., Ltd.,Wuxi 214161,China
  • Received:2017-06-15 Online:2018-11-20 Published:2018-12-11

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Abstract:

Thermomechanical simulation test is an effective method to study the new 9Cr heat-resistant steel. The experiment is carried out under the conditions of temperature 900~1050 ℃ and strain rate of 0.001~10 s -1 to determine the thermal deformation parameters. The constitutive equation of the new 9Cr heat-resistant steel based on the peak stress was established and the hot processing map of materials was drawn from the dynamic material model and Murthy instability criteria. The results show that the temperature and strain rate of deformation have little influence on plasticity of new 9Cr steel, but play a decisive influence on the dynamic recrystallization. The microstructure evolution of new 9Cr steel under different conditions was observed by optical microscope, and then the dynamic recrystallization and the variation were studied.

Key words: metallic material, 9%Cr steel contained B and Co, hot deformation, constitutive equation, processing map

CLC Number: 

  • TG144

Fig.1

Stress-strain relationship at different temperatures"

Fig.2

Relationship between ln σ and ln ε·"

Fig.3

Relationship between σ and ln ε·"

Fig.4

Relationship between ln[sinh(ασ)] and 1/T"

Fig.5

Relationship between ln[sinh(ασ)]and lnε·"

Fig.6

Relationship between lnZ-ln[sinh(ασ)]"

Fig.7

Hot processing map when ε=0.4"

Fig.8

Microstructures under different hot deformation conditions"

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