Strengthening of Ti-6Al-4V alloy by short-time duplex heat treatment
Strengthening of Ti-6Al-4V alloy by short-time duplex heat treatment
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DOI：
10.2320/matertrans.46.1681
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发表时间：
2005-07-01
影响因子：
1.2
通讯作者：
Kawasaki, K
中科院分区：
文献类型：
--
作者：
Morita, T;Hatsuoka, K;Kawasaki, K
研究了短时双重热处理对Ti-6Al-4V合金显微组织和力学性能的影响。该热处理包括在1203 K下固溶处理60 s和随后的水淬加在753、853和953 K下时效40 s。经上述热处理后，合金的屈服强度和抗拉强度均得到显著提高，最大提高率可达25%左右。认为这种强化是由于短时固溶处理后淬火形成α '马氏体相和短时时效时在残留的β相中析出细小的α相所致。尽管在强度上的显着改善，热处理的材料的延展性保持在未处理的材料的水平之上，最有可能的是因为应变诱导马氏体转变发生在β相中，其即使在短时间时效之后也被保留。
The effect of short-time duplex heat treatment on the microstructure and mechanical properties of Ti-6Al-4V alloy was investigated. This heat treatment consisted of solution treatment at 1203 K for 60 s and subsequent water-quenching plus aging at 753, 853 and 953 K for 40 s. The yield strength and tensile strength of the alloy were significantly increased by the above heat treatment and their maximum improvement rates reached about 25%. It was thought that this strengthening was caused by the formation of alpha' martensite phase with quenching after the short-time solution treatment and the precipitation of fine a phase in the retained beta phase during the short-time aging. In spite of the remarkable improvement in the strength, the ductility of the heat-treated materials remained above the level of the non-treated material, most likely because strain-induced martensite transformation occurred in beta phase which was retained even after the short-time aging.