TC21鈦合金電子束焊縫精細組織及其對硬度的影響
發布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-01-26
對TC21鈦合金進行電子束焊接試驗，通過光學顯微鏡和透射電子顯微鏡(TEM)對焊縫內不同特征區域的精細顯微組織進行分析，并對各個區域的顯微硬度進行測量。
TC21鈦合金電子束焊縫精細組織及其對硬度的影響Fine microstructure and its effect on hardness of?electron beam welding joint of TC21 Ti alloy對TC21鈦合金進行電子束焊接試驗，通過光學顯微鏡和透射電子顯微鏡(TEM)對焊縫內不同特征區域的精細顯微組織進行分析，并對各個區域的顯微硬度進行測量。結果表明：TC21鈦合金在焊接過程中，焊縫區和熱影響區Ⅰ、Ⅱ區內發生了馬氏體轉變，由針狀馬氏體α′相和殘余β相組成。熱影響Ⅲ區只發生了α相向β相的轉變。馬氏體轉變量與接頭不同區域的降溫速率有關，焊縫區內馬氏體數量最大，尺寸最大，馬氏體強化效果最明顯，顯微硬度最高。而在熱影響Ⅲ區內無馬氏體強化效果，且β相數量增多，硬度低于母材的，發生軟化。
The electron beam welding of TC21 titanium alloy was carried out. The fine microstructure in various feature regions of weld was analyzed by optical microscopy and transmission electron microscopy. As well, the microhardness of each region was measured. The results show that martensitic transformation occurs in weld zone and heat affected zone I and II which are characterized by acicular martensite α′ phase and retained β phase. The transformation of α to β phase is the only phase change process in heat affected zone Ⅲ. The extent of martensitic transformation is relevant to cooling rate in various region of the joint. The microhardness in weld zone is the highest for martensitic strengthening because there is the largest number of martensite with the biggest size in it. But the material in heat affected zone Ⅲ softened during welding with the increase of β phase and lack of martensitic strengthening effect.
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