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研究了S30432耐热钢在650℃时效时的微观组织和力学性能,特别探讨了S30432钢时效过程中析出相的变化对力学性能的影响。结果表明,实验合金时效初期ε-Cu和M23C6大量析出,随后逐渐长大,其中M23C6尺寸较大且粗化较快,但ε-Cu长期时效后尺寸依然细小。时效初期硬度升高的主要原因是ε-Cu的析出,长期时效过程中ε-Cu尺寸保持细小是硬度稳定在较高水平的主要原因。此外,时效初期由于M23C6大量析出冲击韧性急剧下降,随后M23C6的粗化是冲击韧性继续下降的主要原因。
The microstructure and mechanical properties of S30432 heat-resistant steel were studied when aging at 650 ℃. In addition, the influence of precipitation phase on the mechanical properties of S30432 steel during aging was discussed. The results show that a large amount of ε-Cu and M23C6 are precipitated during the early aging of the experimental alloy, and then grow up gradually. The size of M23C6 is larger and the coarsening is faster, but the size of ε-Cu is still small after long-term aging. The main reason for the increase of hardness at the early aging stage is the precipitation of ε-Cu. The main reason for the stable hardness is that the ε-Cu size remains small during long-term aging. In addition, early aging due to a large number of precipitated M23C6 sharp decline in impact toughness, followed by the coarsening of M23C6 impact toughness continued to decline the main reason.