Cu元素对AMS6308钢抗回火性能的影响

为研究Cu元素对AMS6308钢耐温性的影响,采用SEM、TEM、EBSD、相分析和力学性能测试等手段,研究了不同回火温度下,AMS6308钢(含2％Cu)与不含Cu对比试验钢的组织与力学性能,探讨AMS6308钢中Cu元素对提高抗回火性能的作用.结果 表明,随着回火温度提高,AMS6308钢强度先升后降,450℃出现...

Effect of Cu on temper-resistant of AMS6308 steel

In order to study influence of Cu element on the heat resistance property of AMS6308 steel,microstructure and mechanical properties of AMS6308 steel which contains 2%Cu element and steel without Cu as the contrastive test steel at different tempering temperature was studied by SEM,TEM,EBSD,phase analysis and mechanical properties test. And the effect of Cu on increasing temper-resistant of AMS6308 steel was discussed. The results show that strength rises first and then declines with increasing tempering temperature. Maximum peak of strength appears at 450 ℃ tempering temperature. At the whole tempering temperature range,AMS6308 steel has higher strength than steel without Cu. When tempering temperature below 400 ℃,the element Cu promotes strength and temper-resistant depending on the effect of solution strengthening of Cu,enhancing precipitation strengthening of M₆C phase and refined crystalline strengthening. And enhancing precipitation strengthening of M₆C phase is the main strength method. When tempering temperature exceed 400 ℃,the element Cu promotes strength and temper-resistant depending on the effect of precipitation strengthening of ε-Cu phase. The interaction effect of ε-Cu phase and dislocation produces strong precipitation strengthening and makes the steel maintaining relatively completed lath structure at higher tempering temperature.