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利用俄歇电子能诺技术、断口的电子显微分析、冲击试验等实验方法研究了不同磷含量对40Cr钢可逆回火脆性的影响。结果指出:磷在晶界的平衡偏聚导致40Ct钢在一定热处理条件下的可逆回火脆性,促使沿晶断裂破坏。磷的晶界偏聚量随着该钢磷含量的增加而增加,磷的晶界偏聚量越高脆化越严重。磷含量较高的40Cr钢即使在非脆化条件下,仍然会在与磷结合能较强的一些晶界处产生一定的晶界磷偏聚,因而断口呈现部分沿晶断裂。
The influence of phosphorus content on the reversible temper brittleness of 40Cr steel was studied by Auger electron energy technology, electron microscopic fracture analysis and impact test. The results indicate that the equilibrium segregation of phosphorus in the grain boundaries leads to the reversible temper brittleness of 40Ct steel under certain heat treatment conditions, which causes the intergranular fracture. The amount of segregation of phosphorus in the grain boundaries increases with the increase of phosphorus content in the steel. The higher the segregation amount of phosphorus in the grain boundaries, the more severe the embrittlement. Even if the 40Cr steel with higher phosphorus content produces some segregation of the phosphorus in the grain boundaries at some grain boundaries with strong binding ability with phosphorus even in the non-embrittling conditions, the fracture is partially intergranular fracture.