Hydrogen Traps and Hydrogen Induced Cracking in 20CrMo Steel

DOI Web Site 参考文献40件
  • Li Wei
    Institute of Advanced Steels and Materials, School of Materials Science and Engineering, Shanghai Jiao Tong University Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University
  • Zhu Xu
    Institute of Advanced Steels and Materials, School of Materials Science and Engineering, Shanghai Jiao Tong University
  • Yao Jianjun
    Asylum Research, an Oxford Instruments company
  • Jin Xuejun
    Institute of Advanced Steels and Materials, School of Materials Science and Engineering, Shanghai Jiao Tong University Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University
  • Ding Xifan
    School of Media and Design, Shanghai Jiao Tong University

抄録

<p>The hydrogen trapping sites of commercial 20CrMo steel samples with electrochemically charged hydrogen were characterized by thermoelectric power (TEP) and scanning Kelvin probe force microscope (SKPFM). A surface potential drop of about 190 mV was found for the globular MnS inclusion and 150 mV for the elongated one due to the hydrogen absorption of MnS inclusions. Similar to thermal desorption measurement, TEP is a potential method in analyzing hydrogen traps of solid solution, dislocations and irreversible traps. The fracture morphology and hydrogen induced cracking can be explained by combined hydrogen embrittlement mechanisms. Although hydrogen induced cracks are found to initiate at the elongated inclusions, only longitudinal cracks were observed in this study which is not detrimental to the embrittlement.</p>

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