On the microstructural origin of premature failure of creep strength enhanced martensitic steels

On the microstructural origin of premature failure of creep strength enhanced martensitic steels
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蠕变强度强化马氏体钢过早失效的微观组织根源

DOI:
10.1016/j.jmst.2021.03.001
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发表时间:
2021-03
影响因子:
10.9
通讯作者:
G. Chen
G. Chen
中科院分区:
材料科学1区
文献类型:
--
作者:
J. Li;C. Xu;G. Zheng;W.J. Dai;C.C. Bu;G. Chen

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蠕变强化马氏体钢是超超临界电站主机组的关键材料。对它们的持久寿命评估的研究表明,在长期蠕变后,持久寿命被高估,这就是所谓的过早失效。然而,过早失效的微观结构起源仍不清楚。在这项研究中,我们仔细研究了组织转变及其对蠕变断裂行为的影响,表明马氏体和M23 C6碳化物以及Laves相的演变是导致过早失效的原因。采用多步TTP-LMP方法,确定了不同应力区域下的三阶段蠕变断裂行为。进一步的定量分析表明,中应力区M23 C6碳化物的粗化和马氏体的回复是导致早期失效的主要原因,而低应力区Laves相的析出和粗化是导致早期失效的主要原因。
The creep strength enhanced martensitic steels are key material for the main power generating units in ultra-supercritical plants. Studies on the evaluation of their creep rupture life show there is an overestimation of rupture life after long-term creep, which is known as premature failure. However, the microstructural origin of the premature failure remains unclear. Here in this study, we have carefully investigated the microstructural transformations and their influences on creep rupture behavior, showing that the evolution of martensite and M23C6carbides as well as Laves phase are responsible for the premature failure. By using multi-step TTP-LMP method, we confirmed a three-stage creep rupture behavior under different stress regions. Further quantitative analysis showed that the coarsening of M23C6carbides and recovery of martensite exert equal and dominant effects on the premature failure in the medium stress region, while precipitation and coarsening of Laves phase are responsible for the premature failure in the low stress region.
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发表时间: 2006-09
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