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Crack Initiation and Propagation Analyses of Hydrogen-Related Fracture Surfaces of Tempered Martensitic Steel

  • Takahiro ChibaEmail author
  • Takashi Yasukawa
  • Kenichi Takai
Conference paper
  • 48 Downloads
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

Hydrogen-related crack initiation and propagation in tempered martensitic steel were investigated by fracture surface topography analysis (FRASTA) and crystallographic orientation analysis. Hydrogen-related fracture morphologies of tempered martensitic steel were characterized by intergranular and quasi-cleavage transgranular fractures. FRASTA results suggested that hydrogen-related crack initiation sites were inclusions and cracks propagated from quasi-cleavage fracture to intergranular fracture near the crack initiation site. Crystallographic orientation analysis results suggested that intergranular fracture propagated on prior austenite grain boundaries, whereas quasi-cleavage fracture propagated along {011} planes near the crack initiation site. However, quasi-cleavage fracture consisted of not only {011} planes but also various other planes. In a previous study, hydrogen-related fracture morphologies of tempered martensitic steel tended to change from quasi-cleavage to intergranular with an increase in strength or an increase in hydrogen content, and quasi-cleavage fractures propagated along {011} planes. However, the results of the present study indicate that the fracture propagation path changed from quasi-cleavage fracture along {011} planes and other various planes within the prior austenite grains to intergranular fracture on the prior austenite grain boundaries caused by the influence of an inclusion.

Keywords

Hydrogen embrittlement Martensitic steel Intergranular fracture Quasi-cleavage fracture Crack initiation Crack propagation 

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Copyright information

© The Minerals, Metals & Materials Society 2020

Authors and Affiliations

  • Takahiro Chiba
    • 1
    Email author
  • Takashi Yasukawa
    • 1
  • Kenichi Takai
    • 2
  1. 1.Graduate School of Science and TechnologySophia UniversityTokyoJapan
  2. 2.Faculty of Science and Technology, Department of Engineering and Applied ScienceSophia UniversityTokyoJapan

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