|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advanced High-strength Steels
||Unravelling Hydrogen Enhanced Failure of Pipe-line Steels Using Advanced Microstructural Characterisation Tools
||Jim Hickey, T Ben Britton, Mary Ryan
|On-Site Speaker (Planned)
Understanding microstructurally sensitive hydrogen-induced cracking mechanisms in high-strength steels is of utmost importance for their successful use in extreme environments. In this work, four-point bend coupons of Q125R and L80 pipeline steel grades (both ferritic-martensitic) were elastically strained to fractions of their yield-stress and charged with hydrogen. Post-mortem analysis, using light microscopy, EDS & EBSD, reveals that there are two cracking modes: hydrogen-induced cracks parallel to the main tensile fibre and along segmentation bands; and cracks parallel to the main shear component of the four-point bend geometry, often along martensite lath boundaries. In this talk, we will explore the microstructural contributions to each failure mode with a view to designing steels that decrease the steel’s susceptibility to hydrogen embrittlement.
||Planned: Supplemental Proceedings volume