研究了热处理温度和冷却方式对Ti6246合金显微组织、相组成以及室温拉伸性能的影响.结果表明:固溶热处理后合金的相组成主要与冷却方式有关.在β单相区及(α+β)两相区固溶后水冷,β相均转化为α"马氏体和少量亚稳β相.空冷组织中的β相转变为含有少量次生α的β专变组织,随着热处理温度的提高次生α相的含量逐渐增加,尺寸也逐渐增大.时效后组织中的亚稳相发生分解,析出细小的次生α相.固溶后水冷试样的拉伸曲线上出现“双屈服”现象,且随着固溶温度的提高合金第一屈服点逐渐升高.水淬和空冷合金试样在595℃/8 h时效后其室温拉伸强度提高,延伸率及断面收缩率降低,水淬试样室温拉伸性能的变化更大.固溶后空冷且在595℃时效处理的合金,其室温拉伸性能可达到较好的强塑性匹配.
The influence of heat treatment temperature and cooling rate on the microstructure,phase and tensile deformation behavior of Ti-alloy Ti6246 alloy was investigated.The results show that the a" martensite was observed in prior β phase after solution heat treatment followed by water quenching.While a fine transformed β microstructure produced as a result of air cooling.For the air cooling alloy,both the size and volume fraction of the secondary α grain increased with the increasing solution heat temperature in air cooling samples.A "double yield" phenomenon appeared in the engineering stressstrain curves of the water quenching alloy samples.After aging treatment,the strength of water-and aircooled alloys samples increased but the plasticity decreased.An optimal property in strength and ductility was achieved for the alloysamples after soluted solution treated at 900-920℃ and then aged at 595℃.
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