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Control of hydrogen cracking in the welded steel using microstructural traps

Beidokhti, B ; Sharif University of Technology | 2017

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  1. Type of Document: Article
  2. DOI: 10.1080/02670836.2016.1219499
  3. Publisher: Taylor and Francis Ltd , 2017
  4. Abstract:
  5. Hydrogen diffusion into steel can embrittle the material in H2S environments, but this effect can be offset by suitable hydrogen trapping sites in the microstructure. Fine Ti(C,N) inclusions have been studied as the trapping sites in high strength low alloy (API X-70) welds, with Ti additions ranging from 0.004 to 0.16 wt.%. The trapping sites were investigated by electron microscopy and thermal desorption spectroscopy. Manganese sulphide particles were the main initiation sites for hydrogen induced cracking as expected. The optimum Ti addition was around 0.02% with no evidence of cracking in the weld. The estimated values of trapping activation energy for dislocations, microvoids, MnS and Ti(C, N) were approximately 25.9, 34.6, 65.1 and 87.6 kJ mol−1, respectively. © 2016 Institute of Materials, Minerals and Mining
  6. Keywords:
  7. Hydrogen ; Cracking ; Steel ; Sulphide ; Trapping site ; Activation energy ; Crack initiation ; Cracks ; High strength alloys ; Hydrogen embrittlement ; Thermal desorption spectroscopy ; Welds ; High strength low alloys ; Hydrogen cracking ; Hydrogen diffusion ; Hydrogen induced cracking ; Hydrogen trapping ; Manganese sulphide ; Trapping sites
  8. Source: Materials Science and Technology (United Kingdom) ; Volume 33, Issue 4 , 2017 , Pages 408-414 ; 02670836 (ISSN)
  9. URL: https://www.tandfonline.com/doi/abs/10.1080/02670836.2016.1219499