镍对Cr-Mo-V热作模具钢碳化物析出行为的影响
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第一作者：龚伟
通讯作者：田家龙,姜周华
合写作者：岳建博,廖军,于洋
发表刊物：材料研究与技术杂志
卷号：27
DOI码：10.1016/j.jmrt.2023.10.229
刊物所在地：巴西
摘要：The addition of small amount of nickel to hot-working die steel has been found to be beneficial for hardenability and toughness. In this paper, the addition of nickel to Cr–Mo–V hot-working die steel was studied to improve hardenability, and the inherent mechanism of enhancing toughness was further explored. The research results indicate that nickel as a non-carbide-forming element does not alter the type and total amount of carbide precipitation at equilibrium, but it can dissolve into the matrix and form substitutional lattice distortions with Fe atoms, promoting the dispersion of secondary carbides during the tempering process. This mechanism can reduce intergranular precipitation and inhibit grain boundary embrittlement, thereby improving toughness. However, it can also accelerate the precipitation, aggregation, and growth of secondary carbides during prolonged tempering, which deteriorates the high-temperature anti-softening properties of die steels. The role of Ni has been revealed through thermodynamic and kinetic calculations. The results show that Ni significantly enhances the diffusion coefficient of Cr atoms in the face centered cubic (fcc) Fe matrix during tempering and also improves the phase transition driving force of various precipitates. This work provides new insights into the mechanism of Ni in hot-working die steels, and can provide guidance for designing novel hot-working die steel.
项目来源：企业横向课题
关键字：Hot-working die steel, Ni element, Anti-softening property, Impact toughness, Thermodynamic and kinetic calculations
论文类型：SCI JCR Q1
学科门类：工学
文献类型：JCR 一区
一级学科：冶金工程
页面范围：4452–4460
ISSN号：2238-7854
是否译文：否