淬火温度对Ti-4Al-4.5Mo合金马氏体类型的影响

来源期刊：金属学报2010年第9期

论文作者：李长富 李阁平 杨义 杨柯

文章页码：1061 - 1065

关键词：钛合金； 淬火； 马氏体； 显微硬度

Key words：titanium alloy； quenching； martensitic phase； microhardness

摘    要：对Ti-4Al-4.5Mo合金经不同固溶温度淬火处理后的相组成进行了分析.结果表明,当合金在相变点以上温度淬火后,可以获得hcp结构α′马氏体;随固溶温度降低,淬火后斜方α″马氏体出现,并在一定的温度范围内与α′马氏体共存;在800℃淬火,α″马氏体消失,合金由α和β相构成;α″马氏体显著降低β转变组织的硬度.EDS分析表明,Mo含量并不是决定马氏体类型的唯一因素.

Abstract: There are many discrepancies in the literatures concerning the martensite constitution in theα+βdouble phase titanium alloys after quenching,so the Ti-4Al-4.5Mo alloy was selected to analysis further the martensite phase transformation in the alloy.The results show that when the quenching temperature is above the (α+β)/β transformation temperature (925℃),the hexagonal martensite (α’) formed.With the decrease of quenching temperature,another kind of martensite with orthorhombic structure (α") appeared which can coexist with α’ in a certain temperature range.In the sample quenched at 800℃, theα" disappeared,and the alloy only contains α and β phases.The α" martensite reduced the hardness of martensite transformed structure remarkably.EDS analysis indicated that the content of β stabilized element (Mo) is not the only factor determining the martensitic type.