Effect of thermal ageing on tensile and creep properties of JLF-1 and CLAM steels
Effect of thermal ageing on tensile and creep properties of JLF-1 and CLAM steels
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DOI：
10.1016/j.jnucmat.2008.12.149
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发表时间：
2009-04
影响因子：
3.1
通讯作者：
Yanfen Li;T. Nagasaka;T. Muroga;Qing Huang;Yican Wu
中科院分区：
文献类型：
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作者：
Yanfen Li;T. Nagasaka;T. Muroga;Qing Huang;Yican Wu
JLF-1和CLAM钢在823 K下进行了2000 h的热时效处理以模拟服役条件，并在973 K下进行了100 h的热时效处理以提供严重的过时效。在老化和未老化的材料中进行硬度、拉伸和蠕变断裂测试。结果表明，两种钢经823 K/2000 h时效后，室温硬度均有所提高，蠕变性能也有所改善，表明两种钢均具有强化作用。973 K/100 h时效后，蠕变性能发生软化和劣化。CLAM钢较低的正火和回火温度是其硬度和抗拉强度较高、最小蠕变速率较低和持久时间较长的主要原因，同时也是其对较短时效时间的敏感性较高的主要原因。
The thermal ageing treatments of JLF-1 and CLAM steels were performed at 823K up to 2000h to simulate in-service condition and at 973K for 100h to provide heavy overageing. Hardness, tensile and creep rupture tests were conducted in the aged and un-aged materials. The results showed increase in hardness at room temperature and improvement in creep properties after ageing at 823K/2000h for the both steels, implying the strengthening. However, softening and degradation of creep properties occurred after ageing at 973K/100h. Lower normalization and tempering temperature of CLAM steel were suggested to be responsible for higher hardness and tensile strength, lower minimum creep rate and longer rupture time, and also for higher susceptibility to the thermal ageing of relatively short term than those of JLF-1.