温度对Zr-Sn-Nb合金致应力碘腐蚀开裂的影响

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基金项目:

四川省青年科技基金项目(04ZQ026-053)

核燃料及材料国家重点实验室基金项目(JS0085.1.1.ZS8501)

Effect of Temperature on Iodine-Induced Stress Corrosion Cracking of Zr-Sn-Nb Alloy

1. National Key Laboratory for Nuclear and Materials, Nuclear Pover Institute of China, Chengdu, 61004l, China;
2. School of Materials Science and Engineering, Sichuan University, Chengdu, 6l0065, China

摘要: 研究了N18和N36锆合金在不同温度下的碘致应力腐蚀开裂（SCC）行为,用扫描电镜进行了断口分析。结果表明,对于再结晶状态的锆合金,随着试验温度升高,K_ISCC（临界应力强度因子）降低,裂纹萌生所需的应力降低,裂纹萌生所需的时间也变短；对于去应力状态的N18合金,试验温度从300℃增加到350℃,K_ISCC基本不变,裂纹萌生所需的应力降低,裂纹萌生所需的时间也变短；随着试验温度升高,断口上的腐蚀产物增多。
- Zr-Sn-Nb合金 /
- 碘致应力腐蚀 /
- 开裂 /
- 温度
Abstract: The behaviors of iodine-induced stress corrosion cracking of N 18 and N36 alloys at different temperatures have been investigated.The characterizations of the SCC fractures have been examined by SEM.The results show that,for recrystallized zirconium alloys,the critical stress intensity factor K_ISCCand stress decrease,as well as critical time shortens with test temperature increasing;for stress relieved zirconium alloys,the critical stress intensity factor K_ISCC almost keeps unchanged,but the critical stress decreases and critical time shortens when temperature changes from 300℃to 350℃.The higher temperature is,the more the corrosion product is.
- Zr-Sn-Nb alloy /
- Iodine-induced stress corrosion /
- Cracking /
- Temperature