SM41B 厚鋼板・エレクトロスラグ溶接部の破壊靱性におよぼす後熱処理の影響(<特集>鉄鋼材料の破壊靱性)

概要

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The effect of post welding heat treatments on the notch toughness and fracture mechanics behaviour of 110 mm thick JIS SM41B steel electroslag welding joints has been investigated. The results obtained are summarized as follows : 1. Notch toughness of welded joints normalized became excellent in heat-affected zone, but in weld metal it became lower. In case of stress relief annealed condition weld metal showed best notch toughness. This reason is considered to the variation of microstructure. 2. Fracture toughness values (K_<IC>) of welded joints showed an excellent trend in heat-affected zone with both normalized and stress relief annealed conditions. 3. Fatigue crack growth property of welded joints under stress relief annealed condition was more excellent than those of normalized joints and base metal. 4. There was good correlation between K_<IC> and Charpy transition temperature for both base metal and its welded joints. 5. Dynamic fracture toughness values (K_<Id>) estimated by instrumented Charpy tests can be correlated with static fracture toughness values (K_<IC>) by rate parameter theory.
社団法人日本鉄鋼協会の論文
1978-06-01