Creep deformation and rupture behavior of CLAM steel at 823 K and 873 K
Creep deformation and rupture behavior of CLAM steel at 823 K and 873 K
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DOI：
10.1016/j.jnucmat.2014.08.041
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发表时间：
2014-12
影响因子：
3.1
通讯作者：
Boyu Zhong;B. Huang;Chunjing Li;Shaojun Liu;Gang Xu;Yanyun Zhao;Qunying Huang
中科院分区：
文献类型：
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作者：
Boyu Zhong;B. Huang;Chunjing Li;Shaojun Liu;Gang Xu;Yanyun Zhao;Qunying Huang
摘要中国低活化马氏体钢（CLAM）被选为聚变设计研究（FDS）系列聚变堆概念设计的候选结构材料。本文研究了CLAM钢的蠕变性能。蠕变试验已在823 K和873 K在150-230 MPa的应力范围内进行。蠕变曲线表现出三种蠕变状态，即初级蠕变、稳态蠕变和三级蠕变。最小蠕变速率（ε_（min））与外加应力（σ）的关系符合Norton幂律，应力指数n随蠕变温度的升高而减小。利用扫描电镜（SEM）观察了断裂试样的断口形貌，分析了蠕变机理。用透射电子显微镜（TEM）观察到的析出相粗化表明蠕变试验后的显微组织退化。
Abstract China Low Activation Martensitic (CLAM) steel is selected as the candidate structural material in Fusion Design Study (FDS) series fusion reactor conceptual designs. The creep property of CLAM steel has been studied in this paper. Creep tests have been carried out at 823 K and 873 K over a stress range of 150–230 MPa. The creep curves showed three creep regimes, primary creep, steady-state creep and tertiary creep. The relationship between minimum creep rate (ε ̇ min) and the applied stress (σ) could be described by Norton power law, and the stress exponent n was decreased with the increase of the creep temperature. The creep mechanism was analyzed with the fractographes of the rupture specimens which were examined by scanning electron microscopy (SEM). The coarsening of precipitates observed with transmission electron microscope (TEM) indicated the microstructural degradation after creep test.