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研究了合金元素对一种多元合金钢可逆回火脆性的影响。结果表明，产生可逆回 火脆性的温度范围是４００～５５０℃．主要原因是Ｐ在晶界上的偏聚．沿晶单位面 积的断裂功与Ｐ的偏聚量有Ａｋ＝０．４４－３．４Ｊ／ｍｍ２关系。式中，为Ｐ在 积的断裂功与Ｐ的偏聚量有Ａｋ＝０．４４－３．４ＹＪ／ｍｍ２关系。式中为Ｐ在 晶界偏聚位置分数。阶梯回火不但加速了Ｐ的偏聚速度，而且提高了平衡偏聚量。 合金中的Ｃ排斥Ｐ，并且Ｃ本身有增强晶界结合力的作用，因此适量的Ｃ对防止 可逆回火脆性是有好处的；Ｃｒ有明显促进Ｐ在晶界偏聚的作用．其原因足Ｃｒ与 Ｃ之间交互作用较强；Ｍｎ，Ｎｉ，Ｃｕ山于都会促进Ｐ在晶界的偏聚，所以不同程 度的促进了可逆回火脆性。
The effect of alloying elements on the reversible temper embrittlement of a multi-alloyed steel was investigated. The results show that the temperature range of reversible temper embrittlement is 400 ~ 550 ℃. The main reason is the segregation of P on the grain boundaries. The intergranular fracture energy and the P segregation have Ak = 0.44-3.4J / mm2. In the formula, for P in the product of the fracture work and the amount of P segregation Ak = 0.44-3.4YJ / mm2 relationship. Where P in the grain boundary segregation position score. Step tempering not only accelerated the rate of P segregation, but also increased the amount of segregation segregation. The C in the alloy repels P, and C itself has the effect of enhancing the grain boundary binding force. Therefore, an appropriate amount of C is advantageous for preventing reversible tempering brittleness; and Cr significantly promotes the segregation of P in the grain boundary. The reasons for the strong interaction between Cr and C; Mn, Ni, Cu mountain will promote P in the grain boundary segregation, so to varying degrees, promote reversible temper brittleness.