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观察了锻造后５Ｃｒ２１Ｍｎ９Ｎｉ４Ｎｂ２ＷＮ钢在８５００～１２８０℃加热１ｈ水冷固溶处理后，晶界碳化物的类型、大小、形貌及其随温度的变化情况。试验证明，１１３００Ｃ以下温度加热时，ＮｂＣ块可作为碳源退化成Ｍ２３Ｃ６颗粒。细粒状和细片状晶界碳化物对提高钢的高温延伸性能和断面收缩性能较为有利，而大尺寸块状和大尺寸薄片状碳化物却弱化了晶界，并对高温塑性产生不利影响。推荐这种钢的热加工加热温度为１１８０～１２０００Ｃ。
The shape, size, morphology and the variation with temperature of the grain boundary carbide after 5Cr21Mn9Ni4Nb2WN steel was forged by 85 ℃ ~ 1280 ℃ for 1h were observed. Experiments show that, when the temperature is below 11300C, the NbC block can degenerate into M23C6 particles as a carbon source. The fine grain and fine grain boundary carbides are more favorable to improve the high temperature tensile properties and the cross section shrinkage properties of the steel. However, large size massive and large size flaky carbides weaken the grain boundaries and adversely affect the high temperature plasticity. Recommended heat treatment of steel heating temperature of 1180 ~ 12000C.