GCr15高温金相分析

High Teniperature Metallographic Analysis of Chromium Steel-Cr15

用高温显微镜观察ＧＣｒ１５铸态碳化物偏析的微观结构变化，并观察轧制态的ＧＣｒ１５纵向断口和不同热处理工艺条件下的晶粒度，实验结果表明：在锻轧前加热ＧＧｒ１５钢锭时，先高温下保温较长时间，再加热至始锻（轧）温度，能使碳化物充分溶解与扩散，确定始锻（轧）温度时，晶界偏析的影响不可忽视，同时晶粒粗化倾向需予以控制。

The high temperature microscope is employed to observe the process of mi-crostrutural change of carbide segration in cast alloy steel Cr15 as well as the grain size nearlongitudinal fracture and under different heat-treatment conditions for rolled alloy steelCr15.The results show that the Cr15 ingot being heated should be kept at high temperaturefor a longer time.before forging or rolling and then heated to start-forging (or roiling) tem-perature. In this way, the carbide will sufficiently dissolve and diffuse. The effect of segra-tion near grain boundary should not be ignored when start-forging (or rolling) temperatureis to be determined. Meanwhile,the tendency of grain coarsing is to be controlled.