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- W2359220228 abstract "Using the methods of automatic submerged-arc welding, the BHW35 thick-wall welded joint was made. Welding wires includ H10Mn2NiMoA and H08Mn2MoA matched with two postweld heat-treatment systems individual shortened method A and method B. The experiment applied mechanical properties of bend, tension and impact on the welded joint and base metal, furthermore, its metallograph and SEM fractograph of impact fracture were analyzed. The results indicate that method A welding seam metallograph consist of granular bainite and ferrolites. The microstructure of HAZ is sorbite, bainite and ferrolites. The method B welding seam metallograph consist of granular bainite, sorbite and ferrolites. The microstructure of HAZ is temper bainite, sorbite, and intergranular troostite. The base metal metallograph consist of tempereted sorbite, bainite and ferrolites. The grain size of methods B is coarsening, at room temperature the interval of grain degree is larger. The welding process and properties of both method are satisfied. The strength of welded joint by method B is better than that by method A, and toughness is lower than that by method A. SEM fractograph indicate that the impact fracture by method B exhibit quasi-cleavage and ductile dimple, that by method A all exhibit ductile dimple. The impact toughness in HAZ is better than that in welding seam. The strength reduced ratio of welded joint in method B is higher than method A at high temperature. Due to higher yield ratio, the ability of crack extended resistance of welded joint by method B are lower than that by method A. This study has significant theoretical and applied value on welding structure of BHW35 steel at the high temperature and pressure environment." @default.
- W2359220228 created "2016-06-24" @default.
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- W2359220228 date "2009-01-01" @default.
- W2359220228 modified "2023-09-23" @default.
- W2359220228 title "Research on Microstructure and Mechnical Properties at High Temperature of BHW35 Steel Welded Joint by SAW" @default.
- W2359220228 hasPublicationYear "2009" @default.
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