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首页> 外文期刊>Welding in the World: Journal of the International Institute of Welding: Journal of the International Institute of Welding >Effects of welding parameters on microstructure and mechanical properties of underwater wet friction taper plug welded pipeline steel
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Effects of welding parameters on microstructure and mechanical properties of underwater wet friction taper plug welded pipeline steel

机译：焊接参数对水下湿摩擦锥焊管钢微观结构和力学性能的影响

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摘要

Microstructure and mechanical properties of underwater wet friction taper plug-welded API X52 pipeline steel with 6500-7500-rpm rotational speed at 30-45-kN axial force have been investigated, and the defect-free friction taper plug-welded joints were obtained. It was found that the microstructure in welded joint was remarkably inhomogeneous and very different from the X52 base metal. The weld region could be divided into forged zone (FZ), final frictional plane (FFP), shear deformation zone (SDZ), bonding zone (BZ), and beat-affected zone (HAZ). The HAZ has the coarsest grain and mainly consists of martensite and bainite, and the FZ and SDZ are mainly characterized by a mixture of martensite, bainite, and various shapes of ferrites. The BZ is represented by the banding pattern of fine equi-axed grain ferrites because of local decarbonization around frictional interface in wet welding condition. The axial force has a greater impact on microstructure of welded joint as compared with rotational speed. The hardness profiles measured on cross section of welded joints are severely non-uniform, ranging from 200 to 400 HV1, due to the inhomogeneity of microstructures. The impact absorbed energy of bonding interface sites in welds was considerably lower than that of base metal (about 20% of parent metal) because of the local obviously coarse grain, Widmanstatten ferrites, and banding ferrite defects. The principle of "close mode" friction welding is illustrated, and the microstructural characteristics and mechanical properties of welds can be predicted by judging the type of friction welding.
机译：已经研究了水下湿摩擦锥形圆焊接API X52管道钢的微观结构和力学性能，具有6500-7500-RPM的旋转速度，获得了30-45 kn轴向力，得到了无缺陷的摩擦锥形堵塞接头。发现焊接接头中的微观结构非常均匀，与X52贱金属非常不同。焊接区域可分为锻造区（FZ），最终摩擦平面（FFP），剪切变形区（SDZ），粘合区（BZ）和击败受影响的区域（HAZ）。 HAZ具有典雅的谷物，主要由马氏体和贝氏体组成，FZ和SDZ主要是由马氏体，贝氏体和各种形状的铁氧体的混合物的特征。由于在湿焊接条件下的摩擦界面周围的局部脱碳，BZ由细平轴晶粒铁氧体的条形图案表示。与旋转速度相比，轴向力对焊接接头的微观结构的影响更大。由于微观结构的不均匀性，在焊接接头的横截面上测量的硬度分布严重不均匀，范围为200至400HV1。由于局部明显粗糙的晶粒，Widmantatten铁氧体和带状铁氧体缺陷，焊缝中粘接界面位点的粘接界面位点的粘接界面位点的抗冲击能量显着低得多。示出了“关闭模式”摩擦焊接的原理，通过判断摩擦焊接的类型，可以预测焊缝的微观结构特性和机械性能。

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