工程科学学报，第41卷，第6期：772-780,2019年6月 Chinese Journal of Engineering,Vol.41,No.6:772-780,June 2019 D0:10.13374/j.issn2095-9389.2019.06.009;http:/1 journals.ustb.edu.cn 热变形及热处理过程中TC17钛合金组织与取向的关 联性 原菁骏，姬忠硕，张麦仓⑧ 北京科技大学材料科学与工程学院，北京100083 ☒通信作者，E-mail:mczhang(@usth.edu.cn 摘要为了进一步研究热压缩及热处理过程对组织及取向变化的关联性，通过对T℃17进行热压缩变形及后续热处理，利 用光学显微镜和背散射电子衍射等分析方法，结合晶粒尺寸、织构分布图、极图以及反极图，研究变形后及热处理后的T℃17 的组织结构、晶粒尺寸的变化和取向的演变规律以及两者之间的关联性.结果表明：随着变形温度升高，初生α相含量大幅减 小，尺寸减小，大部分α相晶粒分散分布，且位于高温B相晶粒的三叉晶界上：热处理后，α相和B相组织特征清晰，界限明 显，初生α相依旧存在，且趋于等轴化，亚稳定B相发生转变，形成片层状B转变组织：热变形使α相织构极密度值减小，且随 之温度增加，《相织构极密度值也变小；热变形后的α相已不存在明显的强织构，热变形对α相晶粒的取向影响较大，很明显 的改善了其取向的均匀性：热变形同样使B相织构极密度值减小，但效果不明显.B相仍存在取向集中现象，取向均匀性相对 较差. 关键词TC17合金；相含量：晶粒尺寸：取向均匀性 分类号TG146.2 Correlation between structure and orientation of TC17 titanium alloy during thermal deformation and heat treatment YUAN Jing-jun,JI Zhong-shuo,ZHANG Mai-eang School of Materials Science and Engineering.University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:mezhang@ustb.edu.cn ABSTRACT In the previous studies on the microstructure and orientation of titanium alloys,the microstructural and orientational evolution of typical titanium alloys during thermal compression have been studied in depth.However,studies of the correlation between hot compression and heat treatment processes on microstructural and orientational changes have been few.It is of great significance to further study this correlation during hot treatment.For this study,during hot compression deformation and subsequent hot treatment of TC17 titanium alloy on a thermal simulator using cylindrical specimens,the microstructure,grain size change,and orientation evolution of TC17 were studied using optical microscopy and backscattered electron diffraction analysis.Grain size,texture distribution,pole fig- ure,and reverse polarity were analyzed.Law and the relation between structure and orientation results show that the primary a-content decreases dramatically and size decreases in tandem with deformation temperature.Most of the a phase grains are dispersed and located on the trigeminal grain boundaries of the high temperature B phase grains.After heat treatment,the o phase and B phase had a clear structure and distinct boundary.The primary a phase still exists and tends to be equiaxed,and the metastable B phase changes formed a lamellar B-transformed structure.The hot deformation reduces the density of the o phase texture.Additionally,with increasing tem- perature,the density value of the a phase texture also becomes small.The a phase is no longer strongly textured after thermal deforma- tion,and the orientation of the a phase grains is considerably influenced by thermal deformation,which clearly improves the uniformity 收稿日期：2018-1105工程科学学报，第 41 卷，第 6 期: 772--780，2019 年 6 月 Chinese Journal of Engineering，Vol． 41，No． 6: 772--780，June 2019 DOI: 10． 13374 /j． issn2095--9389． 2019． 06． 009; http: / /journals． ustb． edu． cn 热变形及热处理过程中 TC17 钛合金组织与取向的关 联性 原菁骏，姬忠硕，张麦仓 北京科技大学材料科学与工程学院，北京 100083 通信作者，E-mail: mczhang@ ustb． edu． cn 摘 要 为了进一步研究热压缩及热处理过程对组织及取向变化的关联性，通过对 TC17 进行热压缩变形及后续热处理，利 用光学显微镜和背散射电子衍射等分析方法，结合晶粒尺寸、织构分布图、极图以及反极图，研究变形后及热处理后的 TC17 的组织结构、晶粒尺寸的变化和取向的演变规律以及两者之间的关联性． 结果表明: 随着变形温度升高，初生 α 相含量大幅减 小，尺寸减小，大部分 α 相晶粒分散分布，且位于高温 β 相晶粒的三叉晶界上; 热处理后，α 相和 β 相组织特征清晰，界限明 显，初生 α 相依旧存在，且趋于等轴化，亚稳定 β 相发生转变，形成片层状 β 转变组织; 热变形使 α 相织构极密度值减小，且随 之温度增加，α 相织构极密度值也变小; 热变形后的 α 相已不存在明显的强织构，热变形对 α 相晶粒的取向影响较大，很明显 的改善了其取向的均匀性; 热变形同样使 β 相织构极密度值减小，但效果不明显． β 相仍存在取向集中现象，取向均匀性相对 较差． 关键词 TC17 合金; 相含量; 晶粒尺寸; 取向均匀性 分类号 TG146. 2 收稿日期: 2018--11--05 Correlation between structure and orientation of TC17 titanium alloy during thermal deformation and heat treatment YUAN Jing-jun，JI Zhong-shuo，ZHANG Mai-cang School of Materials Science and Engineering，University of Science and Technology Beijing，Beijing 100083，China Corresponding author，E-mail: mczhang@ ustb． edu． cn ABSTＲACT In the previous studies on the microstructure and orientation of titanium alloys，the microstructural and orientational evolution of typical titanium alloys during thermal compression have been studied in depth． However，studies of the correlation between hot compression and heat treatment processes on microstructural and orientational changes have been few． It is of great significance to further study this correlation during hot treatment． For this study，during hot compression deformation and subsequent hot treatment of TC17 titanium alloy on a thermal simulator using cylindrical specimens，the microstructure，grain size change，and orientation evolution of TC17 were studied using optical microscopy and backscattered electron diffraction analysis． Grain size，texture distribution，pole fig￾ure，and reverse polarity were analyzed． Law and the relation between structure and orientation results show that the primary α-content decreases dramatically and size decreases in tandem with deformation temperature． Most of the α phase grains are dispersed and located on the trigeminal grain boundaries of the high temperature β phase grains． After heat treatment，the α phase and β phase had a clear structure and distinct boundary． The primary α phase still exists and tends to be equiaxed，and the metastable β phase changes formed a lamellar β-transformed structure． The hot deformation reduces the density of the α phase texture． Additionally，with increasing tem￾perature，the density value of the α phase texture also becomes small． The α phase is no longer strongly textured after thermal deforma￾tion，and the orientation of the α phase grains is considerably influenced by thermal deformation，which clearly improves the uniformity