Effect of nickel on thermal fatigue properties of novel hot working die steel

doi:10.13251/j.issn.0254-6051.2023.11.009

Abstract

Abstract: Thermal fatigue test of SDDVA steel and a novel hot work die steel SDYZ1 was carried out by Uddeholm self-constrained thermal fatigue test method. The surface morphology, cross-section crack, microstructure and hardness of the materials after thermal fatigue were compared and analyzed. The effect of nickel element on the cold and thermal fatigue properties of the material was discussed. The results show that compared with the SDDVA steel, the number of cracks in the SDYZ1 steel is obviously less, the depth is shallower, and the degree of high temperature surface softening is smaller. This is mainly due to the fact that Ni element accumulates near grain boundaries and carbides, which has a pinning effect on carbide growth, and the SDYZ1 steel has higher high temperature strength, which can resist crack propagation. The SDYZ1 steel precipitates carbides with smaller size during thermal fatigue, and the accumulation of carbides at grain boundaries can effectively hinder grain growth, thereby improving the fatigue resistance of the material. Through transmission observation and analysis, the main forms of coarse carbide particles after thermal fatigue of the SDYZ1 steel are irregular spherical and slender rods, and the main types are M₂₃C₆ and M₆C, and the size of carbides in the SDYZ1 steel is smaller than that in the SDDVA steel.

Key words: hot work die steel, nickel element, thermal fatigue cracks, microhardness, carbides

CLC Number:

TG142.1

Cheng Xi, Gu Pengcheng, Zeng Yan, Wu Xiaochun. Effect of nickel on thermal fatigue properties of novel hot working die steel[J]. Heat Treatment of Metals, 2023, 48(11): 55-61.

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