熱處理對TG6合金熱模鍛件組織不均勻性的影響
發布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-01-19
采用坯料加熱溫度超過β相變點而模具溫度低于β相變點的熱模鍛造方式，利用光學顯微鏡和圖像分析軟件研究雙重和三重熱處理制度對TG6合金鍛件顯微組織的影響。
熱處理對TG6合金熱模鍛件組織不均勻性的影響Effects of heat treatment on microstructural inhomogeneity of?TG6 alloy hot die forgings采用坯料加熱溫度超過β相變點而模具溫度低于β相變點的熱模鍛造方式，利用光學顯微鏡和圖像分析軟件研究雙重和三重熱處理制度對TG6合金鍛件顯微組織的影響。結果表明：TG6合金熱模鍛件顯微組織的不均勻性是由于變形時發生的β→α相變和微區變形的不均勻造成的。熱處理制度不能徹底消除TG6合金鍛件的顯微組織不均勻性，但隨高溫保溫時間的延長，不均勻程度降低。雙重熱處理時，第一重熱處理后的冷卻速率越慢，次生α相厚度越大。三重熱處理時，第二重較高溫度處理可顯著地減小次生α相的尺寸。
TG6 alloy was forged by the hot die forging process in which the temperature of the billets was above the β transformation temperature and that of the die was below the β transformation temperature. The effects of double and triplex heat treatments on the microstructures of TG6 alloy forgings were studied by optical microscopy and image analysis software. The results show that the microstructure inhomogeneity is caused by the β→α transformation and the inhomogeneity of microdeforming. The microstructural inhomogeneity does not disappear absolutely after heat treatments, but with the increase of heating time, the inhomogeneity decreases. The thickness of secondary α phase becomes large with decrease of cooling rate after the first heat treatment during the double heat treatment. The second high temperature heat treatment decreases the size of secondary α phase during the triplex heat treatments.
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