50mm转子钢超窄间隙激光填丝焊接头组织与性能
发布时间：2018-12-15 07:34
【摘要】：设计了窄间隙的坡口并采用CO2激光填丝多道焊的方法焊接了厚度为50 mm的30Cr2Ni4Mo V转子钢,焊后观察并分析了接头不同区域的组织特征,通过接头的拉伸、弯曲试验及显微硬度评定了接头的性能,结果表明:选取优化的窄间隙激光填丝焊接工艺焊接的50 mm厚30Cr2Ni4Mo V钢对接焊接头成形良好,无侧壁未熔合等缺陷。接头中部填充焊焊缝中心由大量的针状铁素体和少量的粒状贝氏体组成,冲击韧性良好,表层填充焊焊缝由马氏体及少量的粒状贝氏体组成,冲击韧性有所下降。焊接接头拉伸试样均断于母材,接头最大硬度位于接头表层填充焊热影响区(HAZ)粗晶区,焊缝区的硬度较HAZ低很多。
[Abstract]:The narrow gap groove was designed and the 50 mm thickness 30Cr2Ni4Mo V rotor steel was welded by CO2 laser wire filling multi-pass welding. After welding, the microstructure of different regions of the joint was observed and analyzed. The bending test and microhardness were used to evaluate the properties of the joint. The results showed that the 50 mm thick 30Cr2Ni4Mo V steel welded with optimized narrow gap laser filler wire welding process was well formed and had no defects such as the side wall was not fused and so on. The center of the weld is composed of a large number of acicular ferrite and a small amount of granular bainite, and the impact toughness is good. The surface filled weld is composed of martensite and a little granular bainite, and the impact toughness decreases. The tensile specimens of the welded joints are all broken in the base metal. The maximum hardness of the joints is located in the (HAZ) coarse grained zone filled with heat affected zone on the surface of the joints, and the hardness of the weld zone is much lower than that of the HAZ.
【作者单位】： 上海交通大学材料科学与工程学院上海市激光制造与材料改性重点实验室;江苏科技大学材料科学与工程学院先进焊接技术省级重点实验室;
【基金】：上海市重大技术装备研制专项(ZB-ZBYZ-03-11-0485)
【分类号】：TG456.7;TG407
[Abstract]:The narrow gap groove was designed and the 50 mm thickness 30Cr2Ni4Mo V rotor steel was welded by CO2 laser wire filling multi-pass welding. After welding, the microstructure of different regions of the joint was observed and analyzed. The bending test and microhardness were used to evaluate the properties of the joint. The results showed that the 50 mm thick 30Cr2Ni4Mo V steel welded with optimized narrow gap laser filler wire welding process was well formed and had no defects such as the side wall was not fused and so on. The center of the weld is composed of a large number of acicular ferrite and a small amount of granular bainite, and the impact toughness is good. The surface filled weld is composed of martensite and a little granular bainite, and the impact toughness decreases. The tensile specimens of the welded joints are all broken in the base metal. The maximum hardness of the joints is located in the (HAZ) coarse grained zone filled with heat affected zone on the surface of the joints, and the hardness of the weld zone is much lower than that of the HAZ.
【作者单位】： 上海交通大学材料科学与工程学院上海市激光制造与材料改性重点实验室;江苏科技大学材料科学与工程学院先进焊接技术省级重点实验室;
【基金】：上海市重大技术装备研制专项(ZB-ZBYZ-03-11-0485)
【分类号】：TG456.7;TG407
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