回火温度对发电机水冷壁用SA213-T12钢性能的影响

Influence of Tempering Temperature on Performance of SA213-T12 Steel Used for Generator

以发电机水冷壁用高强度钢为研究对象,采用先正火,再淬火,最后回火的热处理工艺对其进行性能优化,分析回火温度对其碳化物析出及对其力学性能的影响。结果表明,当回火温度在400~450℃时,钢中碳化物主要为尺寸较大的M_3C合金渗碳体;当回火温度在450~600℃时,碳化物主要为尺寸较小的弥散分布的M_6C和M_2C;当回火温度达到650℃时,弥散分布的碳化物数量开始减少并发生球化、长大,同时合金钢强度也随回火温度提高逐渐降低,且在高温区间和低温区间回火时强度下降较快。

Taking a high-strength steel used for water cooling wall of generator as the research object,through normalizing,quenching and the tempering treatment,the effect of tempering temperature on carbide precipitation and material mechanical properties were analyzed.The results show that,at the tempering temperature of 400~450 ℃,the main carbide in steel is M_3C with large size;at the tempering temperature of 450~600 ℃,the main carbide is randomly distributed M_6C and M_2C;when the tempering temperature to 650 ℃,the number of carbides in steel decreases and growth nodulized.Meanwhile,the increase of tempering temperature leads to a decrease of the strength of the alloy steel,especially at the low and high temperature range.