3379BA1汽轮机叶片钢的热处理工艺优化

采用正交试验方法研究了3379BA1汽轮机叶片钢热处理工艺与力学性能之间的关系。结果表明:影响试验钢力学性能的因素先后顺序为回火温度、淬火温度、回火时间、淬火时间,得出了最优热处理工艺参数为1050 ℃淬火(保温60 min,油冷)后在700 ℃回火(保温120 min,空冷)。通过试验验证,经最优热处理工艺处理后试验钢可以满足各项性能要求,较工艺优化前冲击吸收能量平均值提升约10 J,屈强比达87.3%。

Optimization of heat treatment process of 3379 BA1 steam turbine blade steel

Orthogonal test method was used to study the relationship between heat treatment process and mechanical properties of the 3379BA1 steam turbine blade steel. The results show that the order of factors affecting the mechanical properties of the tested steel is tempering temperature, quenching temperature, tempering time, quenching time, and the optimal heat treatment process parameters are obtained as follows: quenching at 1050 ℃(holding for 60 min, oil cooling) and then tempering at 700 ℃(holding for 120 min, air cooling). Through test verification, the 3379BA1 steel treated under the optimal heat treatment can meet the property requirements, the average value of impact absorbed energy is higher by about 10 J than before the process optimization, and the yield ratio reaches 87.3%.