Journal of Welding and Joining

  • 제32권1호
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  • Pages.22-27
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  • 2014
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  • 2466-2232(pISSN)
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  • 2466-2100(eISSN)
대한용접접합학회 (The Korean Welding and Joining Society)
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고강도 용착금속의 미세조직이 저온균열에 미치는 영향

The Effects of Microstructure on Cold Crack in High-Strength Weld Metals

  • Lee, Myung-Jin (Department of Materials Science and Engineering, Pusan National University) ;
  • Kang, Nam-Hyun (Department of Materials Science and Engineering, Pusan National University)
  • 투고 : 2014.02.03
  • 심사 : 2014.02.19
  • 발행 : 2014.02.28
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초록

In the past, cold crack was commonly observed in the HAZ(heat affected zone) of high-strength steels. Applying to TMCP(thermo-mechanical controlled process) and HSLA(high strength low alloy) steels, cold crack tends to increase the occurrence in the weld metal. It is generally understood that cold crack occurs when the following factors are present simultaneously : diffusible hydrogen in the weld metal, a susceptible microstructure and residual stress. In particular, many studies investigated the microstructural effect on the cold crack in HAZ and the cold crack in weld metals starts to receive the special attendance in modern times. The purpose of the study is to review the effect of weld microstructures (grain boundary ferrite, Widm$\ddot{a}$nstatten ferrite, acicular ferrite, bainite and martensite) on cold crack in the weld metals. Among various microstructures of weld metals, acicular ferrite produced the greatest resistance to the cold crack due to the fine interlocking nature and high-angle grain boundary of the microstructure.

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참고문헌

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