Characterization of Microstructures and Precipitated Carbides in HAZ which Affect the Reheat Cracking Susceptibility of High Tensile Steel Welds
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概要
- 論文の詳細を見る
Reheat cracking tests by the ring type reheat cracking test and a stress relief test by the three-point bending method were carried out on three types of High Tensile steels (two types H. T 80 and one H. T 100). Influence of microstructures and alloying elements in the matrix of the Heat-Affected Zone on the stress relaxation behavior during the reheat treatment process was studied. Especially, the relation between the concentration of alloying elements in the matrix of synthetic HAZ and the stress relaxation behavior during the reheat treatment process were investigated. As a result, the critical stress of Lath-martensitic structure specimens (water quenched) was found higher 1.4∿2.0 times than that of Bainitic-ferritic structure specimens (air cooled). The reheat cracking susceptibility could be explained by the stress relaxation behavior of specimens and the concentration change of alloying elements in the matrix during the reheat treatment process. Air-cooled specimens which showed a higher cracking susceptibility had not precipitated many alloying carbides and showed a poor deformability. Water quenched specimens with a lower cracking susceptibility had many precipitates and showed a good deformability. The concentration of alloying elements (Mo+V) in the matrix showed a good correspondence to the stress relaxation behavior. Decreasing of (Mo+V) concentration in the matrix leads to a better deformability of the matrix.
- 社団法人溶接学会の論文
- 1991-10-01
著者
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Kikuchi Yasushi
Welding Research Institute Of Osaka Univ.
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Nakamura Mitsuru
Faculty Of Eng. Iwate University
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Kikuchi Yasushi
Welding Research Institute Of Osaka University
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