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http://dx.doi.org/10.5781/JWJ.2014.32.1.22

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)
Publication Information
Journal of Welding and Joining / v.32, no.1, 2014 , pp. 22-27 More about this Journal
Abstract
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.
Keywords
Cold crack; Weld metal; Grain boundary ferrite; Widm$\ddot{a}$nstatten ferrite; Acicular ferrite; Bainite; Martensite;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
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