TC4-DT钛合金的相变过程原位观察

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英文篇名：In-situ Observation of the Phase Transformation Process of TC4-DT Titanium Alloy 作者：王文盛 ; 刘向宏 ; 赵小花 ; 郝芳 ; 张小航 ; 张海 英文作者：Wang Wensheng;Liu Xianghong;Zhao Xiaohua;Hao Fang;Zhang Xiaohang;Zhang Hai;NLEL for Special Titanium Alloy Material Manufacturing,Western Superconducting Technologies Co.,Ltd.;AVIC Chengdu Aircraft Design & Research Institute; 关键词：TC4-DT钛合金 ; 原位观察 ; 高温金相 ; 强织构 英文关键词：TC4-DT titanium alloy;;in-situ observation;;high temperature metallography;;strongly texture 中文刊名：TGYJ 英文刊名：Titanium Industry Progress 机构：西部超导材料科技股份有限公司特种钛合金材料制备技术国家地方联合工程实验室;航空工业成都飞机设计研究所; 出版日期：2018-08-25 出版单位：钛工业进展 年：2018 期：v.35 基金：国家重点研发计划项目(2018YFB1106000);; 陕西省重点研发计划项目(S2018-YF-ZDGY-0413) 语种：中文; 页：TGYJ201804002 页数：6 CN：04 ISSN：61-1292/TG 分类号：11-16

摘要

利用共聚焦显微镜原位观察了存在强织构和正常两种组织的TC4-DT钛合金从室温升温至1 200℃过程中的组织演变,并且与在室温下采用光学显微镜获得的照片进行了对比研究。结果表明,试样加热温度大于500℃时,无需化学浸蚀即可以进行原位观察。试样加热至950℃(Tβ-35℃)时,可观察到球状α相逐渐消失,加热至1 000℃(Tβ+15℃)后观察不到球状α相,判断α→β相转变的温度区间应在950~1 000℃。此外,正常组织试样加热至1 000℃时已经能观察到β晶界和晶界滑移现象,而存在强织构的组织加热至1 170℃左右时才观察到明显的β晶界和晶界滑移现象。强织构会阻碍晶粒再结晶长大,只有加热至Tβ以上一定温度时,晶粒才能再结晶长大。
        The microstructure evolution of TC4-DT titanium alloy with strong texture and normal two tissues was observed from room temperature to 1170℃ by confocal microscopy,and compared with the photo obtained by optical microscope at room temperature. The results show that the sample can be observed in situ without chemical etching when the heating temperature is greater than 500 ℃. When the sample is heated to 950 ℃( Tβ-35 ℃),the globular alpha phase can be observed to disappear gradually,and the spherical alpha phase can not be observed after heating to1 000 ℃( Tβ+ 15 ℃). The temperature range of the phase transition of alpha to beta should be determined at 950 ~1 000 ℃. In addition,the phenomena of crystal boundary and grain boundary slip can be observed when the normal tissue samples are heated to 1 000 ℃. However,the samples with strong texture need to be heated to 1 170 ℃. Strong textures will prevent grain recrystallization from growing. Only when heating to a certain temperature above the phase transition can recrystallization grow.

引文

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