Solidification Crack Susceptibility in Weld Metals of Duplex Stainless Steels : Effects of Ferrite Content and Microsegregation on Solidification Crack Susceptibility(Materials, Metallurgy & Weldability)
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概要
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Solidification crack susceptibilities in weld metals of JIS SUS 329J_2L where ferrite content was varied in the range of about 0 to 100% were evaluated by the Trans-Varestraint cracking test and another practical hot cracking test, and then metallurgical characteristics in weld metals such as microsegregation of detrimental impurities and solidification behavior etc. were studied in relation to the susceptibility. Main conclusions obtained are as follows: (1) Solidification crack susceptibility showed a minimum at a ferrite level of 5 to 20%, and increased as ferrite content decreased or increased. (2) The cause of this tendency was inferred mainly that both quantitative and qualitative properties of such microsegregation as P, S and O in weld metals were changed according to ferrite content. That is to say, in the case of extremely low ferrite content, FeS type sulphide and partial Cr_3P type phosphide were abundant at cellular dendritic boundary. On the other hand, in the case of extremely high ferrite content, Cr_2O_3-Fe_2O_3 type complex oxide containing a high amount of S was abundant at cellular dendritic boundary. On the contrary, these inclusions were not detected in case of 5 to 80% ferrite content. (3) Moreover, it was shown by hot stage microscope that the liquation temperature of grain-boundary in weld metal as a measure of true solidus corresponded well with the lower temperature limit of the BTR, and thus this confirms that the impurity segregation in the extremely high ferrite content was relatively high. (4) Besides, grain size in welding direction during solidification in cases of extremely low and high ferrite content were greater than that in case of 20 to 70% ferrite content. It was suggested that also this tendency was another reason explaining the crack susceptibility.
- 大阪大学の論文
著者
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MATSUDA Fukuhisa
Osaka University
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NAKAGAWA Hiroji
Osaka University
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MURATA Yoshiaki
Sumikin Welding Industries, Ltd.
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Murata Yoshiaki
Sumikin Welding Industries Ltd.
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KATO Ichiro
Sumikin Welding Industries, Ltd.
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Kato Ichiro
Sumikin Welding Industries Ltd.
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Matsuda Fukuhisa
Osaka Univ.
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