本文選題：TA鈦合金　切入點：-不銹鋼　出處：《焊接學(xué)報》2017年02期

【摘要】：以銅焊絲為填充材料對TA15鈦合金與18-8不銹鋼進行填絲鎢極氬弧焊(TIG).利用金相顯微鏡(OM)、掃描電鏡(SEM)、電子探針(EPMA)及顯微硬度計對TA15/18-8接頭的微觀組織、相組成、元素分布及顯微硬度進行了分析.結(jié)果表明,焊縫組織為銅固溶體枝晶;TA15鈦合金側(cè)熔化未混合區(qū)為α-Ti與磷化物脆性相Ti_3P,Ti(Cu,Fe)的混合組織;18-8不銹鋼側(cè)熔合區(qū)為Fe-P共晶組織;磷在18-8不銹鋼側(cè)熔合區(qū)的聚集促進了共晶組織的形成,未參與共晶反應(yīng)的銅形成團狀聚集區(qū);兩側(cè)熔合區(qū)顯微硬度明顯高于熱影響區(qū)和焊縫,Ti_3P脆性相導(dǎo)致鈦合金側(cè)熔化未混合區(qū)的顯微硬度最高值達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 偽 -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.
【作者單位】： 山東大學(xué)材料液固結(jié)構(gòu)演變與加工教育部重點實驗室;
【基金】：國家自然科學(xué)基金資助項目(51575316) 山東省自然科學(xué)基金資助項目(ZE2015EM040)
【分類號】：TG444.74

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