应变幅对国产锻造奥氏体不锈钢环境疲劳寿命影响的试验研究 |
| |
引用本文: | 孙海涛,吕爱林,付强,凌礼恭,贾盼盼,王臣,孙造占,吴欣强. 应变幅对国产锻造奥氏体不锈钢环境疲劳寿命影响的试验研究[J]. 核技术, 2016, 0(12). DOI: 10.11889/j.0253-3219.2016.hjs.39.120604 |
| |
作者姓名: | 孙海涛 吕爱林 付强 凌礼恭 贾盼盼 王臣 孙造占 吴欣强 |
| |
作者单位: | 1. 环境保护部核与辐射安全中心北京 100082;2. 中华人民共和国环境保护部北京 100035;3. 中国科学院核用材料与安全评价重点实验室中国科学院金属研究所沈阳 110016 |
| |
摘 要: | 为验证模拟压水堆核电站冷却剂服役环境对国产锻造主管道用奥氏体不锈钢疲劳寿命的影响,采用高温高压循环水疲劳测试系统对从产品锻件取样加工后的标准试样进行了低周疲劳试验,分析了试验数据与美国机械工程师学会(American Society of Mechanical Engineers,ASME)规范平均/设计疲劳曲线的关系,获得了应变幅对奥氏体不锈钢环境疲劳寿命的影响规律,并初步评价了ASME规范设计疲劳曲线和环境疲劳修正系数的适合性。
|
关 键 词: | 环境影响疲劳 应变幅 奥氏体不锈钢 疲劳裂纹 设计疲劳曲线 |
Experimental study on the effect of strain amplitude on environmental fatigue life of domestic forging austenitic stainless steel |
| |
Abstract: | Background:Environmental assisted fatigue (EAF) is the important issue in the field of fatigue analysis, assessment and safety regulation of pressurized water reactor nuclear components. Some factors affect fatigue life of materials and related mechanisms.Purpose:The aim is to verify the influence of simulated pressurized water reactor coolant environment on the fatigue life of domestic forging main coolant pipe made of austenitic stainless steel. Methods: Fatigue tests were conducted using high-temperature and high-pressure water fatigue testing system, and standard round-bar fatigue specimen made from product forging. Results:The relationship between test data and American Society of Mechanical Engineers (ASME) code fatigue mean/design curve was analyzed. The effect of strain amplitude on fatigue life of austenitic stainless steel was investigated and the suitability of ASME code fatigue design curve and fatigue life environmental correction factor were preliminarily evaluated.Conclusion: The fatigue life of forged 316LN stainless steel in high-temperature and high-pressure water are lower than those at room temperature in air. The environmental degradation is more obvious under low strain amplitudes than that under high strain amplitudes. The best-fit curve based on the updated Argonne National Laboratory (ANL) model is reco mmended for the fatigue de sign of dome stic austenitic stainless steel . The environm ental effects hould be inco rporated into th e fatigue design of domestic austenitic stain less steel. The fatigue crackm ainly initiated from the surf ace micro-pits and slip bands for the do mestic forged austeniticsta inless steel in high-temperature and high-pressure water. |
| |
Keywords: | Environment assisted fatigue Strain amplitude Austenitic stainless steel Fatigue crack Design fatigue curve |
本文献已被 CNKI 万方数据 等数据库收录! |