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针对380 MPa级车轮钢闪光对焊接头组织性能及其滚弯成型失效机制进行了研究。结果表明,车轮钢焊接接头部位分为焊缝区、熔合区、粗晶区和母材区四部分,组织主要由铁素体+魏氏体+贝氏体组成。其中粗晶区的维氏硬度最大,母材区的维氏硬度最小。焊缝滚弯成型失效的主要原因是焊接接头处存在两种非金属夹杂物,一种是由Fe、Al、Si和O元素组成的外来夹杂物,另一种为富含Mn元素的内生夹杂物。因此,解决车轮钢闪光对焊后焊接接头滚弯成型时失效的主要方法是降低原始车轮钢表面氧化层及控制合金Mn含量。
Aiming at the microstructure and failure mechanism of flash-butt welded joints of 380 MPa-class wheel steel, The results show that the welded joints of the wheel steel are divided into four parts: the weld zone, the fusion zone, the coarse grain zone and the base material zone. The microstructure mainly consists of ferrite + Wesbergite + bainite. Among them, the Vickers hardness of the coarse grain region is the largest, and the Vickers hardness of the base material region is the smallest. The main reason for failure of the weld roll forming failure is that there are two kinds of non-metallic inclusions in the welded joints, one is the foreign inclusions composed of Fe, Al, Si and O elements and the other is the endogenous Mn element rich Inclusion. Therefore, to solve the wheel steel flash butt welding welded joint roll forming the main method failure is to reduce the surface of the original wheel steel oxide layer and the control alloy Mn content.