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Microstructural characteristics and mechanical heterogeneity of underwater wet friction taper plug welded joints for low-alloy pipeline steel

机译：低合金管线钢水下湿式摩擦锥塞焊接接头的组织结构和力学异质性

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摘要

Underwater wet friction taper plug welding experiments have been performed on X52 pipeline steel with 6500-7500 rpm rotational speeds at 30-45 kN axial forces, and the microstructural characteristics and mechanical heterogeneity of defect-free friction taper plug welded joints are discussed thoroughly. It is found that the microstructure of welded joint is remarkably inhomogeneous and very different from the base metal. The welded joint has dramatically coarse grains and is dominantly characterized by a mixture of quenched martensite, upper bainite and various types of ferrites including Widmanstätten ferrite. Unlike the traditional solid-state friction welding processes, the relative homogeneous microstructure with fine and equiaxed grains cannot be obtained in the friction taper plug welding process. The axial force has a greater impact on microstructure of welded joint as compared to rotational speed. The hardness profiles measured in cross-section of welded joints are severely non-uniform, ranging from 200 to 400 HV1, due to the inhomogeneity of microstructure. The impact absorbed energy of welded joint with V-notch in the bonding zone was considerably lower than that of base material (about only 20% of parent metal) because of the local obviously coarse grain, Widmanstätten ferrite and banding ferrite defect. The microstructural inhomogeneity results in mechanical heterogeneity.
机译：在轴向力为30-45 kN的条件下，对X52管线钢以6500-7500 rpm的转速进行了水下湿摩擦锥塞焊接实验，并对无缺陷的摩擦锥塞焊接接头的显微组织特征和机械异质性进行了详尽的讨论。发现焊接接头的微观结构明显不均匀，并且与母材有很大不同。焊接接头具有明显的粗大晶粒，并且主要特征是淬火马氏体，上贝氏体和各种类型的铁素体（包括维德曼铁素体）的混合物。与传统的固态摩擦焊接工艺不同，在摩擦锥度塞焊工艺中无法获得具有细晶粒和等轴晶粒的相对均匀的微观结构。与旋转速度相比，轴向力对焊接接头的微观结构影响更大。由于微观结构的不均匀性，在焊接接头的横截面中测得的硬度分布严重不均匀，范围从200到400 HV1。由于局部明显的粗大晶粒，Widmanstätten铁素体和带状铁素体缺陷，在结合区带V形切口的焊接接头的冲击吸收能大大低于母材（仅占母体金属的20％）。微观结构不均匀导致机械异质。

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