Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Study of Hot Salt Stress Corrosion Crack Initiation of Alloy IMI 834 by using DC Potential Drop Method

  • Pustode, Mangesh D. (Kalyani Centre for Technology and Innovation, Bharat Forge Ltd.) ;
  • Dewangan, Bhupendra (Research and Development) ;
  • Raja, V.S. (Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay) ;
  • Paulose, Neeta (Gas Turbine Research Establishment (GTRE)) ;
  • Babu, Narendra (Gas Turbine Research Establishment (GTRE))
  • Received : 2016.06.07
  • Accepted : 2016.10.20
  • Published : 2016.10.31
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Abstract

DC potential drop technique was employed during the slow strain rate tests to study the hot salt stress corrosion crack (HSSCC) initiation at 300 and $400^{\circ}C$. Threshold stresses for HSSCC initiation were found to about 88 % of the yield strength at both temperatures, but the time from crack initiation to final failure (${\Delta}t_{scc}$) decreased significantly with temperature, which reflects larger tendency for brittle fracture and secondary cracking. The brittle fracture features consisted of transgranular cracking through the primary ${\alpha}$ grain and discontinuous faceted cracking through the transformed ${\beta}$ grains.

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