高張力鋼, 低温強靱鋼の熱サイクル試験結果

概要

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This paper presents the results of the investigation made into some factors govering the toughness of heat affected zone (HAZ) in welded steel plates. To examine the toughness of HAZ, a thermal cycle of welding from low heat input to high heat input was applied to 12 kinds of commercial steels comprising high strength steels and steels for low temperature service. The following results were obtained. When heat input is low the HAZ becomes lower bainitic structure or martensitic structure whose toughness is high. But with the increase of heat input, the structure changes to upper bainitic structure, while the toughness becomes lower. It is suggested from the above phenomena that the toughness of HAZ can be improved by adding some elements which serve to increase hardnability. Ni lowers _VT_<rS> of HAZ and a decrease in carbon content improves the toughness of upper bainite.
社団法人日本鉄鋼協会の論文
1972-02-01