鋼板の靭性に及ぼす組立工程における加工の影響(その2) : 線状加熱による熱塑性変形ならびに局所的靭性劣化について

概要

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Line-heating is a thermoplastic working technique widely applied to bending and straightening of hull plates in shipbuilding.In this study, the thermoplastic deformation and the local brittleness due to line-heating for high-strength steel of the 50 kg. per sq. mm class were investigated by the Charpy V-notch impact test, hardness test and observation of microstructure. The results obtained are as follows ;1) The relation between the line-heating condition and the thermoplastic deformation was clarified.2) In the heating at the temperature exceeding the transformation temperature A_c1,the air-cooling causes only little embrittlement.3) In the water-cooling after heating, the embrittlement is comparatively slight if the starting temperature of water-cooling is kept below the transformation temperature A_r1.
社団法人日本船舶海洋工学会の論文