Ti 脱酸低炭素鋼溶接熱影響部の靭性に対する熱履歴の効果

概要

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Toughness and related characteristics of microstructures are examined on heat affected zone (HAZ) of weldments of Ti-killed steel given single-or double-heat cycle treatment. Brittle fracture initiation and stable crack propagation behavior are examined from fracture toughness test, observation of tensile deformation microstructures and local strain distributions. It is revealed that resistance for the stable crack propagation of Ti-killed steel is hardly affected by the simulated thermal cycle conditions. However, the ductile-brittle fracture transition temperature increases in double-heat cycled specimens compared with single-heat cycled specimens. It is also revealed that higher strain concentration takes place at the prior austenite grain boundary in a double-heat cycled specimen. It is discussed that strain localization leads to the brittle crack nucleation.
社団法人日本鉄鋼協会の論文
1998-10-01