Effect of carbon content on thermal fatigue properties of 4Cr5Mo2V hot work die steel

doi:10.13251/j.issn.0254-6051.2020.11.001

Abstract

Abstract: With self-constrained thermal fatigue test method, the effect of carbon content(0.35% and 0.71%) on the thermal fatigue properties of 4Cr5Mo2V hot work die steel was studied by SEM, EDS and Jmat-pro thermodynamic calculation software. The results show that with the increase of carbon content, a large amount of finely dispersed MC-type carbides are precipitated in the steel, so that the temper softening resistance and thermal stability of the 0.71%C steel are better than those of the 0.35%C steel. After 1000 cycles of thermal fatigue, increasing the carbon content delays the initiation of thermal fatigue cracks. When the number of cycles increases to 2000, although the softening of the surface and matrix of 0.71%C steel is weaker than that of 0.35%C steel, but there are many undissolved carbides with large size and obvious aggregation distribution in the 0.71%C steel. These carbides are detached from the matrix under the effect of stress, and the detached places become channels for crack propagation, thereby promoting the initiation and propagation of fatigue cracks.

Key words: carbon content, 4Cr5Mo2V hot work die steel, temper softening resistance, thermal stability, thermal fatigue properties

CLC Number:

Yin Junwei, Zhou Jian, Jiang Yehua, Chi Hongxiao, Lin Peng. Effect of carbon content on thermal fatigue properties of 4Cr5Mo2V hot work die steel[J]. Heat Treatment of Metals, 2020, 45(11): 1-6.

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