通过对时效条件下Super304H钢的微观组织分析,研究了Super304H钢组织变化对韧性的影响。结果表明:Super304H钢在600～700℃的时效温度范围内,随温度升高组织中析出相数量不断增加,但不同析出相的数量增加趋势不同,Nb(C,N)的数量呈缓慢增加趋势,而M23C6的数量先快速增加然后增加幅度趋缓。随M23C6析出量增大,冲击功相应降低,因此M23C6沿晶析出应是Super304H钢时效脆化的主要原因。 Through the microstructure analysis of Super304H steel under aging condition, the influence of the microstructure change of Super304H on the toughness was studied. The results show that the amount of Nb (C, N) increases slowly in the super304H steel at the aging temperature range of 600 ~ 700 ℃ with increasing amount of precipitates in the microstructure with the increase of temperature. , While the number of M23C6 increased rapidly and then increased slowly. As the amount of precipitated M23C6 increases, the impact energy decreases correspondingly, so the precipitation of M23C6 should be the main reason for the aging embrittlement of Super304H steel.