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针对未加稀土与添加稀土的20MnCrNi2Mo耐磨铸钢,对其粒状贝氏体组织分别进行200℃~600℃各自保温1 h的回火处理,采用QUANTA400环境扫描电镜观察试样经不同温度回火后(M/A)岛的变化,采用D8ADVANCE X射线衍射仪对不同温度回火后试样中残留奥氏体量进行定量测定,分析稀土对回火过程中(M/A)岛分解的影响。结果表明,稀土对20MnCrNi2Mo钢粒状贝氏体回火过程中(M/A)岛的分解具有抑制作用,分析认为主要是固溶于钢中的稀土偏聚于界面处、降低了回火过程中碳原子的扩散速度所致。
For 20MnCrNi2Mo wear-resistant cast steel without addition of rare earth and rare earth, the granular bainite was tempered at 200 ℃ ~ 600 ℃ for 1 h respectively. The samples were annealed at different temperatures by QUANTA400 environmental scanning electron microscope (M / A) island, the amount of retained austenite in the samples after tempering at different temperatures was quantitatively determined by D8ADVANCE X-ray diffractometer. The effect of rare earth on the decomposition of M / A was analyzed . The results show that the rare earth can inhibit the decomposition of (M / A) island during the tempering of granular bainite in 20MnCrNi2Mo steel. It is considered that the rare earth mainly dissolved in steel segregates at the interface and reduces the tempering process Carbon atoms due to the proliferation rate.