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本文采用中途淬火的方法,运用化学和物理相分析的手段,研究了15MnMoVNRE钢在热处理过程中钒,铝化合物的溶解,析出规律。结果表明:该钢热轧状态下,70％钒以固溶状态存在,再加热时将发生钒化合物的析出和再溶解,800～850℃之间变化显著。故在两相区淬火或正火,将产生强韧性的波动.预淬火可提高钒的溶解量,增加析出强化的效果,稍许提高预淬火的加热温度是有益的。 钢中铝同样存在析出和再溶解的过程,该铜中铝对提高其奥氏体晶粒粗化温度起主要作用。
In this paper, the method of chemical quenching and physical analysis was used to study the dissolution and precipitation of vanadium and aluminum compounds in 15MnMoVNRE steel during heat treatment. The results show that 70% vanadium exists in solid solution state during the hot rolling of the steel. The precipitation and redissolution of the vanadium compound occur when the steel is reheated, and the change is significant at 800 ~ 850 ℃. So in the two-phase quenching or normalizing, there will be fluctuations in strength and toughness.Pre-quenching can increase the dissolution of vanadium, increasing the precipitation hardening effect, a slight increase in pre-quenching heating temperature is beneficial. Aluminum also exists in the steel precipitation and redissolution process, the aluminum in the copper to improve the austenite grain coarsening temperature plays a major role.