填丝TIG焊TA15钛合金与18-8钢接头的微观组织

发布时间：2018-03-28 13:01

本文选题：TA钛合金　切入点：-不锈钢　出处：《焊接学报》2017年02期

【摘要】：以铜焊丝为填充材料对TA15钛合金与18-8不锈钢进行填丝钨极氩弧焊(TIG).利用金相显微镜(OM)、扫描电镜(SEM)、电子探针(EPMA)及显微硬度计对TA15/18-8接头的微观组织、相组成、元素分布及显微硬度进行了分析.结果表明,焊缝组织为铜固溶体枝晶;TA15钛合金侧熔化未混合区为α-Ti与磷化物脆性相Ti_3P,Ti(Cu,Fe)的混合组织;18-8不锈钢侧熔合区为Fe-P共晶组织;磷在18-8不锈钢侧熔合区的聚集促进了共晶组织的形成,未参与共晶反应的铜形成团状聚集区;两侧熔合区显微硬度明显高于热影响区和焊缝,Ti_3P脆性相导致钛合金侧熔化未混合区的显微硬度最高值达720 HV0.5.
[Abstract]:TA15 titanium alloy and 18-8 stainless steel were used as filler materials for TIG welding of TA15 titanium alloy and 18-8 stainless steel. The microstructure and phase composition of TA15/18-8 joints were studied by means of metallographic microscope, SEM, EPMA and microhardness tester. The elemental distribution and microhardness were analyzed. The results showed that the weld microstructure was Fe-P eutectic structure of the mixed microstructure of copper solid solution dendrite Ta-15 titanium alloy with 伪 -Ti and phosphate brittle phase Ti3PnTiCCuFe). The accumulation of phosphorus in the lateral fusion zone of 18-8 stainless steel promoted the formation of eutectic structure, and copper did not participate in the eutectic reaction. The microhardness of the fusion zone on both sides is obviously higher than that of the heat-affected zone and Ti3P brittle phase of weld metal. The maximum value of microhardness in the unmixed zone of side melting of titanium alloy is 720 HV0.5.
【作者单位】：山东大学材料液固结构演变与加工教育部重点实验室;
【基金】：国家自然科学基金资助项目(51575316) 山东省自然科学基金资助项目(ZE2015EM040)
【分类号】：TG444.74

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