论文部分内容阅读
通过调节扫描轨迹、束流数量、束流能量比、束流间距等参数,进行了316不锈钢电子束焊接同步预热/缓冷复合工艺研究,获得了成形良好的焊接接头。利用光学显微镜、材料试验机、扫描电子显微镜等测试分析了电子束焊接热处理复合接头的显微组织、显微硬度、拉伸性能、拉伸断口。结果表明,与常规电子束焊接相比,电子束焊接热处理复合接头焊缝区的析出相细小均匀,焊缝区及热影响区显的微硬度分布均匀,焊接热处理复合接头抗拉强度提高了6%;接头的微观断口具有韧性断裂特征,断口为典型韧窝断口;电子束焊接热处理复合加工有助于提高焊缝质量和焊缝的力学性能。
By adjusting the scanning trajectory, the number of beams, the beam energy ratio, beam spacing and other parameters, 316 stainless steel electron beam welding synchronous preheating / slow cooling composite technology was studied, and the well-formed welded joints were obtained. The microstructure, microhardness, tensile properties and tensile fracture of electron beam welded heat-treated composite joints were analyzed by optical microscope, material testing machine and scanning electron microscope. The results show that compared with the conventional electron beam welding, the precipitated phase in the weld zone of electron beam welded heat treatment composite joint is fine and uniform, the distribution of microhardness in the weld zone and heat affected zone is uniform, and the tensile strength of welded heat treatment composite joint is increased by 6 %. The microscopic fracture of the joint has the feature of ductile fracture, and the fracture is a typical dimple fracture. The electron beam welding heat treatment compound processing can help to improve the weld quality and the mechanical properties of the weld.