Transformation plasticity of martensite of 5CrNiMoV steel and effect of stress on its kinetics

doi:10.13251/j.issn.0254-6051.2020.11.045

Abstract

Abstract: Axial expansion and contraction martensite transformation in 5CrNiMoV steel under uniaxial stresses lower than the yield strength of austenite were measured by means of DIL-805ADT dynamic dilatometer. Kinetic constants α and Ms in the Koistinen-Marburger equation for martensite transformations were simultaneously determined along with the transformation plasticity coefficient k in Greenwood-Johnson transformation mechanism from the dilation data. Transformation plasticity coefficient and the Greenwood-Johnson model and Leblond model calculation results were compared with the actual test values. The result is that the value of k fluctuates with the change of stress, but approaches a fixed value. The Leblond model is more in line with the test results by contrast. The Ms shows a slight upward trend with the increase of stress, and it shows that the effect of stress lower than or equal to 80 MPa on the Ms is not significant.The α under tensile stress is slightly higher than that under no stress, and α under compressive stress is slightly lower than that under no stress, indicating that tensile stress promotes transformation and compressive stress hinders transformation.

Key words: 5CrNiMoV steel, martensite transformation, transformation plasticity, transformation kinetics

CLC Number:

TG142.33

Peng Xu, Bu Hengyong, Li Mengnie, Zheng Shanju. Transformation plasticity of martensite of 5CrNiMoV steel and effect of stress on its kinetics[J]. Heat Treatment of Metals, 2020, 45(11): 232-238.

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