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对高碳钢在680、700和720℃的等温温度下进行等温球化退火,然后完成相同的淬回火处理。利用图像软件统计分析热处理后组织中碳化物的数量、尺寸和形貌,研究了等温温度对球化组织、淬回火组织的影响。结果表明:700℃等温的球化退火组织中,碳化物的数量最多,平均尺寸最小,圆度最好;680℃时存在较多大尺寸碳化物,碳化物数量最少;720℃时出现片层状碳化物,圆度最差。经不同等温温度退火处理后,淬回火组织中碳化物的变化趋势表现出组织遗传倾向。当等温温度在700℃时,淬回火后可得到细小且弥散分布的未溶碳化物。
The isothermal spheroidizing annealing of high carbon steels at isothermal temperatures of 680, 700 and 720 ° C followed by the same quench and temper. The number, size and morphology of carbides in the treated samples were statistically analyzed by image software. The effects of isothermal temperature on the microstructure and quenched and tempered microstructure were studied. The results show that the number of carbides is the most, the average size is the smallest and the roundness is the best at 700 ℃. In 680 ℃, there are more large size carbides and the least amount of carbides. At 720 ℃, lamellar Carbide, the worst roundness. After annealing at different isothermal temperatures, the tendency of carbides in the quenched and tempered tissues shows the genetic tendency. When the isothermal temperature is 700 ℃, quenching and tempering can be obtained after the fine and dispersed distribution of undissolved carbides.