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熱處理對Ti-22Al-25Nb合金顯微組織演變及顯微硬度的影響
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更新時間：2015-09-09
對Ti-22Al-25Nb鍛造棒材進行熱處理，觀察不同固溶和時效溫度下合金的顯微組織，研究其演化規(guī)律，并根據(jù)顯微硬度評價該合金的基本性能。
熱處理對Ti-22Al-25Nb合金顯微組織演變及顯微硬度的影響Effect of heat treatment on microstructural evolution and micro-hardness of Ti-22Al-25Nb orthorhombic alloy
對Ti-22Al-25Nb鍛造棒材進行熱處理，觀察不同固溶和時效溫度下合金的顯微組織，研究其演化規(guī)律，并根據(jù)顯微硬度評價該合金的基本性能。結(jié)果表明：合金的顯微組織主要取決于熱處理工藝。在980 °C以下進行固溶處理，合金的顯微組織包括等軸α2相、圍繞α2鑲嵌的O相、板條O相以及B2基體；在980 °C以上進行固溶處理，顯微組織主要包括等軸O相以及B2基體。在不同溫度下時效，板條O相的尺寸及形態(tài)發(fā)生明顯變化：在840 °C時效析出O相的板條粗最大，在760 °C效析出O相的板條最細小。不同溫度下時效的顯微硬度與熱處理溫度滿足線性變化關(guān)系。
The forged Ti-22Al-25Nb alloy was heat treated, and the microstructures under different solution treatments and aging times were observed and the evolution was studied. The basic properties of the alloy were evaluated based on the hardness. The results show that the microstructure of the alloy is mainly depended on heat treatment schedule. Equiaxed α2?grains, rim O around α2, and equiaxed O and B2 matrix could be obtained after the samples were solution treated below 980 °C, while equiaxed α2?grains and B2 matrix existed when the samples were solution treated above 980 °C. The aging temperature is very important for the size and morphology of acicular O phase. The largest precipitate size occurred at 840 °C and the finest size was displayed at 760 °C. Experimental and statistical analysis show linear relationship between micro-hardness and the temperature of heat treatment.
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