化学成分和热处理工艺对1Cr10Mo1NiWVNbN转子钢力学性能的影响

Influences of Chemical Composition and Heat Treatment Process on Mechanical Properties of 1Cr10Mo1NiWVNbN Rotor Steel

采用力学性能测试和显微组织分析等方法研究了化学成分和淬火温度、回火温度、淬火冷却速率及回火冷却速率等热处理工艺参数对1Cr10Mo1NiWVNbN转子钢力学性能的影响。结果表明:为获得最佳的综合力学性能,钢中碳、氮含量宜控制在中下限,钒、铌含量宜控制在中上限,镍、锰含量宜控制在上限,铬含量宜控制在下限;随淬火温度的提高,试验钢强度不断增加,韧性下降;随二次回火温度的提高,强度下降,塑性略有增加,冲击功增加,但为满足技术条件的要求,二次回火温度需高于690℃;随淬火冷却速率的降低,强度、塑性、韧性均降低;随回火冷却速率的降低,强度略有增加,韧性略有下降。

The Influences of chemical composition and heat treatment parameters including temperature, cooling rate for quenching and teimpering on the mechanical properties of 1Cr10Mo1NiWVNbN rotor steel were investigated by means of tensile and impact tests, as well as optical microstructure analysis. The results show that the contents of carbon and nitrogen should be controlled at the lower intermediate level, the contents of vanadium and niobium upper intermediate level, the contents of nickel and manganese at the upper limit, and the content of chromium at the lower limit in order to obtain the better mechanical properties. The strength of the tested steel increased continuously and the impact toughness decreased with the raising of quenching temperature. With the raising of second tempering temperature, the strength decreased, and both the ductility and impact toughness increasd, and the second tempering temperature should be higher than 690 ℃ in order to satisfy the specification of steel. With the decrease of cooling rate for quenching , the strength and ductility as well as toughness decreased. With the decrease of cooling rate for tempering, the strength increased and the impact toughness decreased.