Experimental study on the effect of strain amplitude on environmental fatigue life of domestic forging austenitic stainless steel

Haitao SUN; Ailin LYU; Qiang FU; Ligong LING; Panpan JIA; Chen WANG; Zaozhan SUN; Xinqiang WU

doi:10.11889/j.0253-3219.2016.hjs.39.120604

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Experimental study on the effect of strain amplitude on environmental fatigue life of domestic forging austenitic stainless steel

NUCLEAR ENERGY SCIENCE AND ENGINEERING | 更新时间：2021-05-24

- Experimental study on the effect of strain amplitude on environmental fatigue life of domestic forging austenitic stainless steel
- NUCLEAR TECHNIQUES Vol. 39, Issue 12, Article number: 120604(2016)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2016.hjs.39.120604
  CLC： TL351.6
- Received：20 January 2016，
  
  Revised：25 October 2016，
  
  Published：2016-12
- 稿件说明：
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Haitao SUN, Ailin LYU, Qiang FU, et al. Experimental study on the effect of strain amplitude on environmental fatigue life of domestic forging austenitic stainless steel[J]. Nuclear techniques, 2016, 39(12): 120604
DOI：

Haitao SUN, Ailin LYU, Qiang FU, et al. Experimental study on the effect of strain amplitude on environmental fatigue life of domestic forging austenitic stainless steel[J]. Nuclear techniques, 2016, 39(12): 120604 DOI： 10.11889/j.0253-3219.2016.hjs.39.120604.

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。

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 recommended for the fatigue design of domestic austenitic stainless steel. The environmental effect should be incorporated into the fatigue design of domestic austenitic stainless steel. The fatigue crack mainly initiated from the surface micro-pits and slip bands for the domestic forged austenitic stainless steel in high-temperature and high-pressure water.

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Keywords

references

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Haitao SUN , Chen WANG , Dongqing XIONG , . Effect of PWR coolant environment on the fatigue life of reactor equipment materials . Nuclear Science and Engineering , 2014 . 34 ( 4 ): 482 - 487 . http://www.cnki.com.cn/Article/CJFDTOTAL-HKXY201404009.htm .

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国家标准化管理委员会.GB/T 15248:金属材料轴向等幅低循环疲劳试验方法[S].北京:中国标准出版社, 2008

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ASME:Rules for construction of nuclear facility components[S].New York:American Society of Mechanical Engineers, 2004

徐松 , 吴欣强 , 韩恩厚 , . 核电站用钢的高温高压水腐蚀疲劳研究进展 . 腐蚀科学与防护技术 , 2007 . 19 ( 5 ): 345 - 349 . http://www.cnki.com.cn/Article/CJFDTOTAL-FSFJ200705011.htm .

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