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根据TC4合金β相区加热时α→β转变速度较快的特点,提出了一种热处理工艺:β相区短时固溶淬火+时效。本文对经β相区短时固溶处理后,合金的显微组织变化规律及其对性能的影响进行了研究。结果表明:β相区短时固溶淬火可获得板条、针状两种形态的马氏体,板条状马氏体量随固溶时间延长而减少。经时效后,板条状马氏体分解,析出相细小弥散;针状马氏体析出相粗大,且呈方向性分布。两种形态马氏体的析出对合金强度贡献的差异不大,而对延伸率影响的差异比较显著。1050℃固溶时间小于12s时,时效后合金的性能可与常规处理(两相区固溶时效处理)保持同一水平,并略有提高,同时,由于固溶时间较短,可达到节约能源,防止污染的目的。
According to the characteristic of α → β transition speed when the β-phase region of TC4 alloy is heated, a heat treatment process is proposed: a short-time β-phase solution solution quenching + aging. In this paper, the microstructure evolution of the alloy and its effect on the properties of the alloy after solution treatment in a short time in the β-phase region were studied. The results show that martensite with two kinds of laths and acicular forms can be obtained by solution quenching in a short time in the β phase region. The amount of lath martensite decreases with the increase of the solution time. After aging, the slab-like martensite decomposition, precipitated phase fine dispersion; acicular martensite precipitated phase coarse, and the directional distribution. The differences in the contribution of the two forms of martensite to the alloy strength are insignificant, while the differences in the effects on elongation are notable. When the solid solution time is less than 12s at 1050 ℃, the properties of the alloy after aging can be kept at the same level with the conventional treatment (solid solution aging treatment in two-phase zone) and slightly increased. At the same time, energy saving can be achieved due to the short solution time. Prevent pollution.