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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 the high strength steel for water wall of generator as the research object, the performance of the generator was optimized by using the first normalizing, then quenching, and the last tempering heat treatment. The influence of tempering temperature on its carbide precipitation and its mechanical properties was analyzed. The results show that when the tempering temperature is in the range of 400-450 ℃, the carbides in the steel are mainly cementite with the size of M_3C. When the tempering temperature is in the range of 450-600 ℃, the carbides are mainly of small size The distribution of M_6C and M_2C; when the tempering temperature reached 650 ℃, the number of dispersed carbide began to decrease and spheroidization, growth, while the strength of the alloy steel with the tempering temperature gradually decreased, and in the high temperature range and low temperature Interval tempering strength decreased rapidly.