机械工程学报 >

2018 , Vol. 54 >Issue 14: 43 - 49

DOI: https://doi.org/10.3901/JME.2018.14.043

材料科学与工程

FV520B钢在湿H2S+Cl-环境中的腐蚀疲劳性能

  • 魏仁超 ,
  • 陈学东 ,
  • 范志超 ,
  • 聂德福 ,
  • 吴乔国 ,
  • 金有海
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  • 1. 中国石油大学(华东)化学工程学院 青岛 266580;
    2. 合肥通用机械研究院有限公司国家压力容器与管道安全工程技术研究中心 合肥 230031
魏仁超,女,1990年出生,博士研究生。主要研究方向为强度与断裂。E-mail:lajiao6687@126.com

收稿日期: 2017-08-21

  修回日期: 2018-03-26

  网络出版日期: 2018-07-20

基金资助

国家重点基础研究发展计划资助项目（973计划，2012CB026003）。

收起

Corrosion Fatigue Behavior of FV520B Steel in Aqueous H2S+Cl- Environment

  • WEI Renchao ,
  • CHEN Xuedong ,
  • FAN Zhichao ,
  • NIE Defu ,
  • WU Qiaoguo ,
  • JIN Youhai
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  • 1. College of Chemical Engineering, China University of Petroleum(Huadong), Qingdao 266580;
    2. National Technology Research Center Vessel and Pipeline Safety Engineering, Hefei General Machinery Research Institute Co. Ltd., Hefei 230031

Received date: 2017-08-21

  Revised date: 2018-03-26

  Online published: 2018-07-20

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摘要

针对离心压缩机叶轮叶片疲劳寿命研究的需要，考虑到服役环境对疲劳寿命的影响，开展叶轮典型材料FV520B钢在湿H2S+Cl-环境中的腐蚀疲劳试验研究，结合断口形貌观察分析其疲劳失效机理，建立疲劳寿命预测模型。结果表明，FV520B钢在湿H2S+Cl-环境中的疲劳性能相较于大气环境大幅下降，并随着环境中H2S浓度升高而下降；随着应力幅值降低，介质中的H2S对疲劳性能的影响逐渐显现并随应力幅值降低而增大。疲劳断口形貌观察表明，试样表面存在点蚀坑，疲劳裂纹在点蚀坑处萌生并扩展。最后，在点蚀演化寿命预测模型的基础上，结合氢对疲劳演化过程的影响，建立考虑应力及腐蚀介质共同作用的疲劳寿命预测模型，预测结果与试验数据吻合较好。该模型可为湿H2S+Cl-环境下材料的疲劳寿命预测提供基础支持。

关键词： FV520B钢; 湿H2S+Cl-; 腐蚀疲劳; 点蚀

本文引用格式

魏仁超 , 陈学东 , 范志超 , 聂德福 , 吴乔国 , 金有海 . FV520B钢在湿H2S+Cl-环境中的腐蚀疲劳性能[J]. 机械工程学报, 2018 , 54(14) : 43 -49 . DOI: 10.3901/JME.2018.14.043

Abstract

In order to investigate the fatigue life of centrifugal compressor impeller, corrosion fatigue tests of FV520B stainless steel in air and aqueous H2S+Cl- environment are carried out. The corrosion fatigue failure mechanism of FV520B steel is analyzed combining with the fracture morphology observation and a modified fatigue life prediction model is built. The results demonstrate that corrosion fatigue lives of FV520B steel aqueous H2S+Cl- environment are dramatically decreased compare with those in air and decreased further with the increasing of H2S. Corrosion fatigue damages caused by hydrogen emerge gradually when the applied stress amplitude is relatively low and increased with the decreasing of applied stress amplitude. Microstructure observation revealed that corrosion pits are found on the surface of the specimens and the fatigue cracks are initiated on the surface of the specimens in all corrosion mediums and then propagated. Considering the effect of hydrogen on fatigue behavior of FV520B steel, a modified fatigue life prediction model is proposed on the basis of pitting corrosion mechanism. The model predictions are in good agreement with the test results, which can provide some insight into fatigue life prediction of materials exposed to aqueous H2S+Cl- environment.

Key words： FV520B stainless steel; aqueous H2S+Cl-; corrosion fatigue; pitting corrosion

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