Impurity effects in stress relief cracking of a Mn–Cr–Mo–Ni steel

J. Sun, R. Zaiss, M. Menyhard, C. J. McMahon

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5 Citations (Scopus)


Isothermal stress relaxation tests at fixed displacement on coarse-grained laboratory heats of A508-2-type steel, normally highly susceptible to stress relief cracking (SRC), have established that trace impurities are essential for this phenomenon. An undoped heat made from iron containing ˜5 ppm sulphur in a high-purity crucible was found to be extremely resistant to SRC. Subsequent chemical analysis showed that this steel contained 2 ppm boron and an inadvertant 66 ppm nitrogen, which presumably scavenged the boron to some extent. Other high-purity heats were doped with boron, sulphur, and phosphorus, singly and in combinations. Boron and sulphur additions were always deleterious; phosphorus sometimes appeared to have beneficial effects. High-resolution scanning Auger spectroscopy confirmed the role of surface-adsorbed sulphur in the cracking mechanism.

Original languageEnglish
Pages (from-to)139-145
Number of pages7
JournalMaterials Science and Technology (United Kingdom)
Issue number2
Publication statusPublished - Feb 1987

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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