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Micromechanisms of Hydrogen-Assisted Cracking in Super Duplex Stainless Steel Investigated by Scanning Probe Microscopy

[+] Author Affiliations
Bai An, Takashi Iijima

National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, Japan

Chris San Marchi, Brian Somerday

Sandia National Laboratories, Livermore, CA

Paper No. PVP2014-28181, pp. V06BT06A009; 6 pages
  • ASME 2014 Pressure Vessels and Piping Conference
  • Volume 6B: Materials and Fabrication
  • Anaheim, California, USA, July 20–24, 2014
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4604-9
  • Copyright © 2014 by ASME


Understanding the micromechanisms of hydrogen-assisted fracture in multiphase metals is of great scientific and engineering importance. By using a combination of scanning electron microscopy (SEM), scanning tunneling microscopy (STM), atomic force microscopy (AFM) and magnetic force microscopy (MFM), the micromorphology of fracture surface and microcrack formation in hydrogen-precharged super duplex stainless steel 2507 are characterized from microscale to nanoscale. The results reveal that the fracture surfaces consist of quasi-brittle facets with riverlike patterns at the microscale, which exhibit rough irregular patterns or remarkable quasi-periodic corrugation patterns at the nanoscale that can be correlated with highly localized plastic deformation. The microcracks preferentially initiate and propagate in ferrite phase and are stopped or deflected by the boundaries of the austenite phase. The hydrogen-assisted cracking mechanisms in super duplex stainless steel are discussed according to the experimental results and hydrogen-enhanced localized plasticity theory.

Copyright © 2014 by ASME



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