Hot Cracking in Synthetic Weld Heat-Affected Zone on Ni-Cr-Mo type Higher Strength Steel
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概要
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Using a tentative hot cracking test apparatus for synthetic weld thermal cycle, the hot cracking conditions in the weld heat-affected zone on Ni-Cr-Mo type HY-130 class HT 100 high strength steel were investigated. Meanwhile the hot cracking mechanism in the heat-affected zone of the test steel was studied through direct observation under high temperature microscope and through XMA analysis. It has been revealed that hot cracks in the heat-affected zone of the test steel in the hot cracking apparatus are initiated when the peak temperature of weld thermal cycle is over about 1350℃ and contraction is restrained in the cooling range of 1350∿1380℃. In direct observation under high temperature microscope, preferential liquation on the grain boundary of the heat-affected zone took place at about 1355∿1360℃, which is lower than the solidus temperature, when the test steel was rapid-heated. On the grain boundary heated to over this temperature, a white-looking banded structure of 1-2μ width was recognized, showing that the boundary had been liquated. XMA line analysis has revealed that this white grain boundary is due mainly to enrichment of Ni and Cr. From the results of analysis of rolling segregation bands laminarly distributed on the steel plate as well as other experiments on grain boundary migration and enrichment, it is concluded that the hot cracking mechanism in the weld heat-affected zone of the test steel can as well be explained by the segregation model as in the early case of SUS 310 steel. In the present test steel, sulfides are not considered to play a major role in the development of grain boundary liquation in the weld heat-affected zone.
- 社団法人溶接学会の論文
著者
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TAMURA Hiroshi
Tokyo Research Institute, Seikagaku Corporation
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Kato Noboru
Tokyo Institute Of Technology
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WATANABE Takehiko
Tokyo Institute of Technology
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Tamura Hiroshi
Tokyo Institute Of Technology
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Watanabe Takehiko
Tokyo Institute Of Technolngy
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Tamura Hiroshi
Tokyo Institute Of Technolngy
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