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首页> 外文期刊>ISIJ international >Microstructural Evolution and the Effect on Mechanical Properties of S30432 Heat-resistant Steel during Aging at 650°C
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Microstructural Evolution and the Effect on Mechanical Properties of S30432 Heat-resistant Steel during Aging at 650°C

机译：650°C时效时效S30432耐热钢的组织演变及其对力学性能的影响

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In this paper, the mechanical properties and microstructural evolution of S30432 heat-resistant steel during aging at 650°C were investigated, and the effect of microstructural evolution on the yield strength, tensile strength, hardness and impact toughness was discussed. The results show that, the change of strength and hardness can be divided into three stages. In the first stage (before 500 h), the precipitation of fine ε-Cu plays a main role in the significant increase of the strength and hardness. In the second stage (500–5000 h), the coarsening of ε-Cu is the key factor to decrease the strength and hardness. After 5000 h of aging, there is no obvious change in the strength and hardness. Similarly, the change of impact toughness during aging of S30432 steel at 650°C can also be divided into three stages. The sharp decrease of impact toughness in the first stage results from the precipitation of M_(23)C_(6) and ε-Cu particles. At stage II, the impact toughness keeps on declining as a result of gradual coarsening of M_(23)C_(6), ε-Cu and Nb(C,N). Finally, M_(23)C_(6), ε-Cu and Nb(C, N) are relatively stable, so that the impact toughness tends to be stable gradually.
机译：研究了S30432耐热钢在650℃时效时的力学性能和组织演变，探讨了组织演变对屈服强度，拉伸强度，硬度和冲击韧性的影响。结果表明，强度和硬度的变化可分为三个阶段。在第一阶段（500小时之前），细小的ε-Cu的沉淀在强度和硬度的显着提高中起主要作用。在第二阶段（500-5000小时），ε-Cu的粗化是降低强度和硬度的关键因素。老化5000小时后，强度和硬度没有明显变化。同样，S30432钢在650°C时效时的冲击韧性变化也可以分为三个阶段。第一阶段冲击韧性的急剧下降是由于M_（23）C_（6）和ε-Cu颗粒的沉淀所致。在第二阶段，由于M_（23）C_（6），ε-Cu和Nb（C，N）逐渐变粗，冲击韧性持续下降。最后，M_（23）C_（6），ε-Cu和Nb（C，N）相对稳定，因此冲击韧性趋于逐渐稳定。

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