低焊接裂纹敏感性钢焊接接头组织及微观力学性能

采用埋弧自动焊接方法焊接高强度低焊接裂纹敏感性钢板,并对其焊接接头进行显微组织观察、维氏显微硬度和纳米压痕检测.结果表明:粗晶热影响区的显微组织以粗大粒状贝氏体为主,由于该区的精细结构中含有大量纳米级析出相,且位错密度较高,使得该区具有较高的维氏显微硬度和纳米硬度值;焊缝区和细晶热影响区的主要显微组织分别为针状铁素体+...

Structure and Micromechanical Properties of a Weld Joint Using Steel with Low Sensitivity to Weld Cracking

Submerged arc welding technology was used to weld a steel plate with low susceptibility to weld cracking,and microstructure observation,conventional Vickers microhardness and nanoindentation examination were conducted in the heat affected zone(HAZ).The results show that a coarse grained HAZ mainly consisted of coarse granular bainite.Owing to a large number of nanoprecipitates and higher dislocation density,the higher microhardness and nanohardness were obtained in the coarse grained HAZ.The weld zone and f...