论述了高强近β型钛合金电子束焊的焊后热处理对显微组织、力学性能和断裂特性的影响.随着焊后热处理温度的提高,将引起母材和焊接接头β晶粒中α沉淀相的粗化,并促使在β晶界处粗大的、更加连续的α相的长大.与显微组织的变化相一致,高的焊后热处理温度促进了母材及焊缝区硬度和强度的下降和韧性的提高.并在570℃/24 h,AC时效时达到最佳强韧性匹配.之后,随着时效温度继续升高,韧性反而会降低.
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