张贵华,董洪波,朱深亮,刘诚

• 1:南昌航空大学材料科学与工程学院

摘要(Abstract)：

TC4-DT钛合金经高温恒应变速率变形后,进行三重热处理,具体工艺为:(920~960℃)×1 h水冷(WQ)+(880~920)℃×1h WQ+820℃×1.5 h空冷(AC),观察热处理后的微观组织。结果表明:TC4-DT钛合金950℃变形后,第一重热处理温度越高,初生等轴α相含量越少,在温度为920℃时由等轴α相、针状α'相及β基体组成,960℃时等轴α相完全消失;第二重热处理中,初生α相有减少的趋势,温度越高,减少越快。第二重热处理温度对次生条状α相含量及最终形态也有影响,当二重热温度为920℃时得到的条状α组织更为粗大;经过第三重热处理,条状α相的间距均匀,在条状一次次生α相之间分布有更加细小的二次次生α相。因而采用不同条件的多重热处理制度可以调节材料的微观组织,包括次生α的长度、宽度及次生α片层的数量等,从而可以优化TC4-DT钛合金的微观组织。TC4-DT钛合金950℃高温变形后,经960℃×1 h WQ+880℃×1 h WQ+820℃×1.5 h AC热处理,得到细小均匀的网篮组织;经940℃×1 h WQ+920℃×1 h WQ+820℃×1.5 h AC热处理,得到双态组织。

关键词(KeyWords)： TC4-DT钛合金;高温;拉伸;热处理;微观组织

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51164029)

作者(Author): 张贵华,董洪波,朱深亮,刘诚

DOI: 10.13289/j.issn.1009-6264.2015.08.016

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