Ti40阻燃钛合金电子束焊接头组织与力学性能

发布时间：2018-06-19 17:42

本文选题：Ti阻燃钛合金 + 电子束焊　；参考：《材料导报》2017年16期

【摘要】：采用不同工艺参数对2mm厚Ti40阻燃钛合金进行电子束焊接(EBW),通过金相分析、电子探针(EPMA)、室温拉伸以及显微硬度测试对Ti40阻燃钛合金电子束焊接接头的显微组织和力学性能进行分析。结果表明,焊缝中分布着晶粒内部有片层状组织析出的β柱状晶和少量等轴β晶粒,熔合线到焊缝中心晶粒逐渐细化,无明显热影响区。接头中易产生气孔、裂纹等缺陷,通过添加直线扫描波形能够有效地控制焊缝气孔缺陷,从而提高接头的强度。添加直线扫描波形电子束焊的Ti40阻燃钛合金的抗拉强度仍可达到917 MPa,断口呈现出脆性断裂与韧性断裂的混合特征,焊缝区的硬度高于母材,其最大值为376HV。
[Abstract]:2mm thick Ti40 flame retardant titanium alloy was welded by electron beam welding with different process parameters, and metallographic analysis was carried out. The microstructure and mechanical properties of electron beam welded joints of Ti40 flame retardant titanium alloy were analyzed by EPMA, room temperature tensile and microhardness test. The results show that there are 尾 columnar grains and a small amount of equiaxed 尾 grains in the grains of the weld. The grains from the fusion line to the center of the weld are gradually refined, and there is no obvious heat affected zone. It is easy to produce defects such as porosity and crack in the joint. By adding straight line scanning waveform, the weld hole defects can be effectively controlled and the strength of the joint can be improved. The tensile strength of Ti40 flame-retardant titanium alloy added with linear scanning wave electron beam welding can still reach 917 MPA. The fracture surface shows the mixed characteristics of brittle fracture and ductile fracture. The hardness of weld zone is higher than that of base metal, and its maximum value is 376HV.
【作者单位】：南昌航空大学轻合金加工科学与技术国防重点学科实验室;西北工业大学凝固技术国家重点实验室;
【基金】：轻合金加工科学与技术国防重点学科实验室开放课题研究基金(GF201201004) 西北工业大学凝固技术国家重点实验室开放课题(SKLSP201634)
【分类号】：TG456.3

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