Cr8合金钢热变形行为及位错密度演变规律

doi:10.13229/j.cnki.jdxbgxb20180969

Abstract

Abstract:

Hot compression tests on Cr8 alloy were carried out on Gleeble-1500D thermal simulation test machine in the deformation temperature range from 900 ℃ to 1200℃ and strain rate range from 0.005 s^-1 to 5 s^-1．X-ray diffraction tests of the samples after hot deformation were carried out, and the hot deformation behavior and dislocation density evolution of Cr8 alloy were investigated．Based on the data of experiment, a two-stage constitutive model containing multiple parameters was established in consideration of dislocation density evolution．The results show that the true stress-true strain curves of Cr8 alloy show the typical characteristics of dynamic recrystallization under low strain rate．The hot deformation activation energy of Cr8 alloy is 423.41 kJ/mol, and the calculated values of the constitutive model agree well with the experimental values．Under the experimental conditions，the total dislocation density of Cr8 alloy reached above 10¹⁴ cm^-2, and the total dislocation density increased with increasing strain rate and decreasing deformation temperature．

Key words: metallic material, Cr8 alloy, hot deformation, constitutive model, dislocation density

CLC Number:

TG142.33

Xue-wen CHEN,Ji-ye WANG,Xi-qing YANG,Tao HUANG,Ke-xing SONG. Hot deformation behavior and dislocation density evolution regularity of Cr8 alloy[J].Journal of Jilin University(Engineering and Technology Edition), 2020, 50(1): 91-99.

Figures/Tables 7

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