Effect of low-temperature tempering on confined precipitation and mechanical properties of carburised steels

回火 材料科学 马氏体 冶金 降水 延展性(地球科学) 表层 相(物质) 微观结构 脆性 极限抗拉强度 猝灭(荧光) 碳纤维 图层(电子) 复合材料 蠕动 气象学 有机化学 化学 物理 复合数 荧光 量子力学
作者
Tao Qing,Jian Wang,E.I. Galindo-Nava
出处
期刊:Materials Science and Engineering A-structural Materials Properties Microstructure and Processing [Elsevier BV]
卷期号:822: 141688-141688 被引量:16
标识
DOI:10.1016/j.msea.2021.141688
摘要

Surface-carburised steels are widely used in gears and bearings. The mechanical properties of the surface layers are crucial to improve contact fatigue and anti-wear performance. In this study, the effect of low-temperature tempering on confined precipitation and mechanical properties across surface layers in a high-alloy carburising steel (18Cr2Ni4W) were investigated. The steel was tempered at 240 °C with different tempering durations. Microstructure changes, including confined precipitation, and local mechanical properties were analysed layer-by-layer. During tempering, the morphology and size of martensite remained unchanged while confined precipitation occurred in martensitic matrix; coherent ε phase precipitates formed after 1.5 h, they then transformed to less coherent η phase within 3 h and subsequently evolved to non-coherent θ phase after 3 h of tempering. After tempering for 1.5 h, the strength and ductility of the surface layers reach a maximum value, and elongation of the surface layers with high carbon content is comparable to that of the core with low carbon content. It is revealed that the coherent ε precipitates are mainly responsible for the increase in strength; whilst ductility of the martensitic matrix increases due to a reduced carbon concentration, avoiding tempering brittleness. The results are valuable to the optimisation of surface properties of carburised steels using lower temperature tempering.
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