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通过对新型Ti C增强耐磨钢进行在线回火热模拟试验,采用扫描电子显微镜(SEM)结合能谱INCA Feature功能分析了回火温度对Ti C粒子体积分数和尺寸分布的影响。结果表明:与未经热处理的试验钢相比,回火后钢中Ti C析出相的体积分数有所增加。但温度较低时(500℃),析出相增加不明显且小尺寸粒子(1~3μm)所占比例偏低,大于5μm的析出相所占比例高。随回火温度的增加,高于550℃后,析出相总量显著提高,同时尺寸分布在1~3μm范围内的粒子所占比例明显增加,650℃回火时,达到72%左右。且粒子的最大尺寸及其比例均下降。因此,500℃回火主要有利于Ti C粒子的粗化长大,而温度超过550℃后则Ti C粒子的形核、析出过程更加显著,粒子尺寸较小。
The effect of tempering temperature on the volume fraction and size distribution of Ti C particles was analyzed by scanning electron microscopy (SEM) and energy spectrum INCA Feature function. The results show that the volume fraction of TiC precipitated phase in steel increases after tempering compared with the test steel without heat treatment. However, when the temperature is low (500 ℃), the increase of precipitate phase is not obvious and the proportion of small size particles (1 ~ 3μm) is low. The proportion of precipitates larger than 5μm is high. With the increase of tempering temperature above 550 ℃, the total amount of precipitated phase increased significantly, while the proportion of particles with size distribution in the range of 1 ~ 3μm increased obviously, reaching 72% at 650 ℃. And the maximum size of particles and their proportion decreased. Therefore, tempering at 500 ℃ is mainly beneficial to the coarsening and growth of TiC particles. However, the nucleation and precipitation of TiC particles at 550 ℃ are more remarkable and the particle size is smaller.