本文選題：鋁合金　切入點：微觀組織　出處：《航空材料學報》2015年03期 　論文類型：期刊論文

【摘要】：研究了不同溫度焊后時效處理對2219鋁合金變極性鎢極氬弧焊(VPTIG)接頭各微區(qū)顯微組織的影響,采用顯微硬度測試和透射電鏡觀察分析焊接接頭各微區(qū)析出相的形貌和分布。結果表明,焊后時效處理溫度不同,焊接接頭各微區(qū)顯微組織和硬度發(fā)生的變化不同。熱影響區(qū)中的完全回復區(qū)對焊后時效最為敏感,低溫處理時顯微硬度就有明顯增長,并在160℃處理時達到最大漲幅;焊縫區(qū)變化相對較小,其顯微硬度的最高漲幅出現在210℃,且小于前者;熱影響區(qū)中的過時效區(qū)最為穩(wěn)定,顯微硬度的最大增長同樣出現在160℃,但漲幅很小。透射電鏡觀察表明,焊接接頭各微區(qū)的顯微硬度變化主要與時效強化相的析出行為有關。
[Abstract]:The effect of aging treatment after welding at different temperatures on the microstructures of the VPTIGW joints of 2219 aluminum alloy with variable polarity tungsten inert gas arc welding (TIG) was studied. The morphology and distribution of precipitated phases in various microregions of welded joints were analyzed by microhardness test and transmission electron microscope. The results showed that the aging treatment temperature was different after welding. The changes of microstructure and hardness of the welded joints are different. The fully recovered zone in the HAZ is the most sensitive to the aging after welding, and the microhardness increases obviously at low temperature, and reaches the maximum increase at 160 鈩，

本文編號：1608155