深冷处理对高碳高合金工具钢SDC99回火过程碳配分的影响

发布时间：2019-03-30 12:27

【摘要】：采用内耗和三维原子探针结合硬度测试研究了深冷处理对高碳高合金工具钢SDC99不同回火温度下组织和碳偏聚情况的影响。结果表明:深冷处理显著提高工具钢SDC99的硬度,深冷处理试样较淬火试样硬度提高2HRC,深冷处理并200℃回火试样比常规热处理试样硬度提高1.5HRC;深冷处理后碳原子与位错的相互作用增强,内耗的Snoek-Kê-K?ster(SKK)峰强度提高,位错密度增加;深冷处理后碳原子的偏聚程度加剧,淬火、深冷、淬火并200℃回火、深冷并200℃回火试样中富碳相的碳浓度峰值分别为2%、8%、8%和15%(原子分数)。
[Abstract]:The effects of cryogenic treatment on microstructure and carbon segregation of high carbon and high alloy tool steel SDC99 at different tempering temperatures were studied by internal friction and three-dimensional atomic probe hardness test. The results show that the hardness of tool steel SDC99 is significantly improved by cryogenic treatment, the hardness of cryogenic treated sample is 2HRC higher than that of quenched sample, and the hardness of cryogenic treated and tempered sample is 1.5HRC higher than that of conventional heat treatment sample. After cryogenic treatment, the interaction between carbon atoms and dislocations is enhanced, the intensity of Snoek-K 锚-K?ster (SKK) peak of internal friction is increased, and the dislocation density is increased. After cryogenic treatment, the degree of segregation of carbon atoms intensifies, quenching, cryogenic, quenching and tempering at 200 鈩，

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