采用力学性能测试、金相分析以及TEM微观结构分析,研究了淬火和回火冷却速度对X12CrMoWVNbN10-1-1耐热钢力学性能的影响,并探讨了脆化机制,结果表明:在相同的回火工艺下,随淬火冷却速度的降低,强度降低,塑性变化不大,但冲击值增加,其主要原因是缓冷降低了马氏体基体的再结晶温度,导致基体的回复与再结晶程度增加;随回火冷却速度的降低,屈服强度略增加,抗拉强度、塑性变化不大,而冲击值下降,具有高温回火脆性的特征。 The effect of quenching and tempering cooling rate on the mechanical properties of X12CrMoWVNbN10-1-1 heat-resistant steel was studied by means of mechanical property test, metallographic analysis and TEM microstructure analysis. The mechanism of embrittlement was also discussed. The results showed that in the same time In the fire process, the strength decreases with the decrease of the quench cooling rate and the plasticity does not change much, but the impact value increases. The main reason is that the slow cooling reduces the recrystallization temperature of the martensite matrix, resulting in the increase of the matrix recovery and recrystallization ; With the tempering cooling rate decreases, the yield strength slightly increased tensile strength, plastic little change, while the impact value decreased, with high temperature temper brittleness characteristics.