Evolution of microstructure and changes of mechanical properties of CLAM steel after long-term aging
Evolution of microstructure and changes of mechanical properties of CLAM steel after long-term aging
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DOI：
10.1016/j.msea.2013.08.025
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发表时间：
2013-12
期刊：
影响因子：
6.4
通讯作者：
Xue-Ning Hu;Lixing Huang;Wei Yan;Wei Wang;W. Sha;Y. Shan;Ke Yang
中科院分区：
文献类型：
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作者：
Xue-Ning Hu;Lixing Huang;Wei Yan;Wei Wang;W. Sha;Y. Shan;Ke Yang
中国低活化马氏体（CLAM）钢已被开发为未来聚变堆的候选结构材料。研究CLAM钢在热暴露过程中的组织演变和力学性能变化是十分必要的。在本研究中，CLAM钢在600 °C和650 °C的空气中进行了1100 h、3000 h和5000 h的长期热时效。研究了时效过程中显微组织的演变规律，包括M23C6碳化物的生长特征、Laves相的形成以及亚晶的演化。组织演变导致CLAM钢力学性能的变化。热时效过程中，钢的韧脆转变温度（DBTT）明显升高，这与钢基体中Laves相的形成有关。基于M23C6碳化物与亚晶界的相互作用，分析了热暴露过程中稳定组织的可能机制。
The China Low Activation Martensitic (CLAM) steel has been developed as a candidate structural material for future fusion reactors. It is essential to investigate the evolution of microstructure and changes of mechanical properties of CLAM steel during thermal exposure. In this study, the long-term thermal aging of the CLAM steel has been carried out in air at 600 °C and 650 °C for 1100 h, 3000 h and 5000 h. The microstructural evolution with aging time was studied, including characteristics of the growth of M23C6carbides and the formation of Laves-phase precipitates as well as the evolved subgrains. The microstructural evolution leads to the changes of mechanical properties of the CLAM steel. The Ductile–Brittle Transition Temperature (DBTT) increases significantly during the thermal aging, which is related to the formation of Laves-phase in the steel matrix. The possible mechanism of stabilizing microstructure during the thermal exposure has been analyzed based on the interaction between M23C6carbides and subgrain boundaries.