回火温度对高氮轴承钢碳化物演变及硬度的影响
发布时间：2019-04-25 16:40
【摘要】：对高氮马氏体不锈轴承钢进行直接淬火并重复2次深冷及不同温度的回火处理,采用光学显微镜、SEM电镜,TEM电镜和洛氏硬度计等,研究了不同回火温度下碳化物的演变规律与硬度变化的相关性,在不同回火温度下根据硬度出现先下降后上升再下降变化的趋势,对各回火温度下碳化物的尺寸区间分布频数、单位面积数量、平均尺寸及碳化物所占单位面积比进行了表征及分析,结果表明:随回火温度由150升高到500℃,碳化物的尺寸随回火温度的升高从0.39长大至0.62μm,碳化物为近球形M23C6型。150~300℃回火时硬度下降与基体脱溶有关;300~450℃回火时碳化物单位面积数量及所占面积分数都增加;回火至500℃时,细小碳化物聚集长大单位面积数量减少,碳化物所占面积分数减少。由此得出回火时硬度变化与析出碳化物的单位数量和其面积分数有关。
[Abstract]:High nitrogen martensitic stainless steel was quenched directly and tempered at different temperatures for two times. Optical microscope, SEM electron microscope, TEM electron microscope and Rockwell hardness tester were used. The relationship between carbide evolution and hardness change at different tempering temperatures is studied. According to the tendency of hardness decreasing first, then rising and then decreasing, the distribution frequency of carbide size range at each tempering temperature is studied. The unit area quantity, the average size and the unit area ratio of carbides are characterized and analyzed. The results show that with the tempering temperature increasing from 150 to 500 鈩，
本文编号：2465289
[Abstract]:High nitrogen martensitic stainless steel was quenched directly and tempered at different temperatures for two times. Optical microscope, SEM electron microscope, TEM electron microscope and Rockwell hardness tester were used. The relationship between carbide evolution and hardness change at different tempering temperatures is studied. According to the tendency of hardness decreasing first, then rising and then decreasing, the distribution frequency of carbide size range at each tempering temperature is studied. The unit area quantity, the average size and the unit area ratio of carbides are characterized and analyzed. The results show that with the tempering temperature increasing from 150 to 500 鈩，
本文编号：2465289
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