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对Ti-6Al-4V合金铸件,先自β相变点以上温度淬火,随后进行970℃(?)750℃循环热处理,能有效地细化铸件的粗大魏氏组织,提高综合机械性能.研究表明,淬火工序可消除晶界α,还可获得全马氏体组织,从而切断了原粗大魏氏组织的遗传性.在随后进行的循环热处理过程中,马氏体分解,β相在α′条的位错及亚结构边界上析出,使原α′条被分割为许多α小晶体,这些小晶体随后聚集长大成位向混乱、互相交织的α针,并随着热循环而发生碎断和球化,成为细碎的网篮组织.
For Ti-6Al-4V alloy castings, quenching from the temperature above β transformation point followed by heat treatment at 750 ℃ for 970 ℃ can effectively refine the coarse Widman’s structure and improve the mechanical properties. , The quenching process can eliminate the grain boundary α, but also obtain the whole martensite, thus cutting off the original coarse Widman’s heredity in the subsequent cycle of heat treatment, the martensite decomposition, β phase in α ’ Dislocation and sub-structure boundary precipitation, so that the original α ’is divided into many α small crystals, these small crystals then gathered to grow to confusion, intertwined α needle, and with the thermal cycle and broken and Ball-shaped, become a crushing basket organization.