Multiscale investigation of quasi-brittle fracture characteristics in a9Cr–1Mo ferritic–martensitic steel embrittled by liquid lead–bismuthunder low cycle fatigue

Research output: Contribution to journalArticle

Authors

Institutes & Expert groups

  • KUL - Katholieke Universiteit Leuven
  • UA - Universiteit Antwerpen

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Abstract

Liquid metal embrittlement (LME) induced quasi-brittle fracture characteristics of a 9Cr–1Moferritic–martensitic steel (T91) after fatigue cracking in lead–bismuth eutectic (LBE) have been inves-tigated at various length scales. The results show that the LME fracture morphology is primarilycharacterized by quasi-brittle translath flat regions partially covered by nanodimples, shallow secondarycracks propagating along the martensitic lath boundaries as well as tear ridges covered by micro dimples.These diverse LME fracture features likely indicate a LME mechanism involving multiple physical pro-cesses, such as weakening induced interatomic decohesion at the crack tip and plastic shearing inducednano/micro voiding in the plastic zone.

Details

Original languageEnglish
Pages (from-to)137-152
JournalCorrosion Science
Volume102
DOIs
Publication statusPublished - 14 Oct 2015

Keywords

  • Steel, AFM, SEM, TEM, LME

ID: 1658543