多道次氬焊對鈦合金顯微結構與腐蝕行為之研究

本研究目的在於探討惰性氣體鎢極電弧銲對鈦合金進行單道次與多道次（二道次和三道次）銲接其顯微結構、微硬度與腐蝕行為之影響。利用光學顯微鏡、掃描式電子顯微鏡、能量散佈光譜儀、電子微探分析儀與X光繞射儀探討銲道的顯微結構。實驗結果顯示，在銲道可以明顯地觀察到費德曼組織，熔融區的微觀結構則呈現針狀的麻田散體α相、層狀的β相和針狀的馬田散體α’相。在微硬度測量方面，多道次銲接的銲道與熱影響區的硬度值皆比單道次銲接的硬度值低。電化學試驗結果顯示，多道次銲接能改善鈦合金的耐腐蝕性。

關鍵字

氣體鎢極電弧銲； Ti-6Al-4V ；電化學腐蝕；模擬體液；海水

並列摘要

The purpose of the present study was to discuss the effect of single pass and multi-pass (double and triple pass) tungsten inert gas welding on microstructure, microhardness and corrosion behavior of Ti–6Al–4V titanium alloy. Microstructures of the weldments were investigated using optical microscopy, scanning electron microscopy, energy dispersive spectroscopy, electron probe x-ray microanalyzer and X-ray diffraction analysis. The results showed the Widmanstatten structure was clearly visible in the weld metal. The microstructure revealed a fusion zone presents an acicular martensitic α phase, interlamellar β phase and martensite needles α’ phase. Microhardness values of weld metal and HAZ made under multi-pass were lower than that made under single pass welding. Electrochemical tests indicated that the corrosion resistance could be improved by multi-pass welding.

並列關鍵字

TIG ； Titanium alloy ； Electrochemical corrosion ； Simulated body fluid ； Seawater

參考文獻

[30] 吳東穎，“鈦合金與雙相不銹鋼硬銲接合之機械性質與結構特性研究”，碩士論文，國立虎尾科技大學材料科學與綠色能源工程研究所，民國103年7月。

[31] 曹文琥、鐘惠玲，“不同劣化環境對結構用鋼腐蝕速率的影響”，碩士論文，中華技術學院土木防災工程研究所，2007，6月。

[3] Lu Shixiong, Cui Qinglong, Huang Yongxian, Zheng Chuanqi, Wang Yang, “Microstructure and Mechanical Properties of Thick Titanium Alloy Joint in Narrow-gap TIG Welding”, Transactions of The China Welding Institution, 33(8), 2012, pp.81-85.

[5] Tapany Udomphol, Titanium and its alloys, 2007.

[9] Krebs Robert E., The History and Use of Our Earth's Chemical Elements: A Reference Guide (2nd edition), Westport, CT: Greenwood Press, 2006.

國際替代計量

多道次氬焊對鈦合金顯微結構與腐蝕行為之研究

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