Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Effect of Microstructure on Hydrogen Induced Cracking Resistance of High Strength Low Alloy Steels

  • Koh, Seong Ung (Dept. of Mat. Sci. and Tech., Pohang Univ. of Sci. and Tech.) ;
  • Jung, Hwan Gyo (Technical Research Center, Pohang Iron & Steel Co., Ltd.) ;
  • Kim, Kyoo Young (Dept. of Mat. Sci. and Tech., Pohang Univ. of Sci. and Tech.)
  • Published : 2007.08.01
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Abstract

Hydrogen induced cracking (HIC) was studied phenomenologically and the effect of microstructure on HIC was discussed for the steels having two different levels of nonmetallic inclusions. Steels having different microstructures were produced by thermomechanically controlled processes (TMCP) from two different heats which had the different level of nonmetallic inclusions. Ferrite/pearlite (F/P), ferrite/acicular ferrite (F/AF), ferrite/bainite (F/B) were three representative microstructures for all tested steels. For the steels with higher level of inclusions, permissible inclusion level for HIC not to develop was different according to steelmicrostructure. On the contrary, HIC occurred also at the martensite/austenite (M/A) constituents regardless of steel microstructure when they accumulated to a certain degree. It was proved that M/A constituents were easily embrittled by hydrogen atoms. Steels having F/AF is resistant to HIC at a given actual service condition since they covers a wide range of diffusible hydrogen content without developing HIC.

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