工程科学学报，第39卷，第12期：1844-1850,2017年12月 Chinese Journal of Engineering,Vol.39,No.12:1844-1850,December 2017 D0l:10.13374/j.issn2095-9389.2017.12.010:http://journals..ustb.edu.cn 循环热处理及形变对TC17钛合金片层组织球化和取 向的影响 陈少华”，张麦仓)四，贾萌柳”，彭桃 1)北京科技大学材料科学与工程学院，北京1000832)有色金属研究总院，北京100088 ☒通信作者，E-mail:mczhang(@usth.cdu.cn 摘要将循环热处理与形变相结合，利用电子背散射衍射等手段探究该工艺对TC17钛合金片层组织球化和取向的影响. 结果表明：TC17钛合金在两相区进行单纯的循环热处理其片层组织球化程度有限，而经过循环热处理+压缩变形后，其魏氏 组织消失，片层α相得到明显球化，但是其取向均匀性仍没发生较大变化.此外，变形中两相的再结晶速度及其强韧性导致 了两相取向的差异性.α相的再结晶速度快于B相，在变形过程中，α相的各向异性首先降低：另一方面，由于相比B相硬 度高，热变形过程中，α相的变形程度小于B相，应变主要集中在与相邻近的较软的B相，从而导致α相的取向均匀性高于 B相. 关键词TC17合金；形变热处理：片层组织：球化：取向 分类号TG146.23 Effect of cyclic heat treatment with hot deformation on the microstructure and structural orientation of TC17 titanium alloy lamellae CHEN Shao-hua,ZHANG Mai-eang,JIA Meng-liu,PENG Tao?) 1)School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China 2)General Research Institute for Nonferrous Metals,Beijing 100088,China Corresponding author,E-mail:mczhang@ustb.edu.cn ABSTRACT The effects of cyclic heat treatment and hot deformation on the spheroidization and orientation of the TC17 titanium al- loy were investigated using a light microscope (LM)and electron backscattered diffraction(EBSD).The experimental results indicate that in the two-phase temperature range of a simple,cycle heat treatment,the spheroidization of the lamellar microstructure of the TC17 titanium alloy is finite.After cyclic heat treatment and compression deformation,the Widmannstatten structure disappears,the spheroidized a lamellae is more obvious,but the uniformity of its orientation is not greatly improved.In addition,the recrystallization velocity,and the strength and toughness of the two phases in deformation lead to a difference in their orientation,and the recrystalliza- tion velocity of the a phase is faster than that of the B phase.In the deformation process,the anisotropy of the a phase is preferentially reduced.On the other hand,during the hot deformation process,the degree of deformation of the a phase is lower than that of the B phase,because the o phase is harder than the B phase.The strain is primarily concentrated on the softer B phase adjacent to a phase, which produces greater uniformity in o phase than in the B phase. KEY WORDS TC17 alloy;thermal mechanical treatment;lamellar structure;spheroidization:orientation TC17合金是一种综合性能优良的富B相的α+B且热稳定性能、抗疲劳性能、热加工性能都较高，可 两相钛合金，具有较高的强度、淬透性和断裂韧性，在α+B相区或B相区进行锻造则.TC17合金主 收稿日期：201704-25工程科学学报，第 39 卷，第 12 期: 1844--1850，2017 年 12 月 Chinese Journal of Engineering，Vol． 39，No． 12: 1844--1850，December 2017 DOI: 10． 13374 /j． issn2095--9389． 2017． 12． 010; http: / /journals． ustb． edu． cn 循环热处理及形变对 TC17 钛合金片层组织球化和取 向的影响 陈少华1) ，张麦仓1) ，贾萌柳1) ，彭 桃2) 1) 北京科技大学材料科学与工程学院，北京 100083 2) 有色金属研究总院，北京 100088 通信作者，E-mail: mczhang@ ustb． edu． cn 摘 要 将循环热处理与形变相结合，利用电子背散射衍射等手段探究该工艺对 TC17 钛合金片层组织球化和取向的影响． 结果表明: TC17 钛合金在两相区进行单纯的循环热处理其片层组织球化程度有限，而经过循环热处理 + 压缩变形后，其魏氏 组织消失，片层 α 相得到明显球化，但是其取向均匀性仍没发生较大变化． 此外，变形中两相的再结晶速度及其强韧性导致 了两相取向的差异性． α 相的再结晶速度快于 β 相，在变形过程中，α 相的各向异性首先降低; 另一方面，由于 α 相比 β 相硬 度高，热变形过程中，α 相的变形程度小于 β 相，应变主要集中在与 α 相邻近的较软的 β 相，从而导致 α 相的取向均匀性高于 β 相． 关键词 TC17 合金; 形变热处理; 片层组织; 球化; 取向 分类号 TG146. 23 Effect of cyclic heat treatment with hot deformation on the microstructure and structural orientation of TC17 titanium alloy lamellae CHEN Shao-hua1) ，ZHANG Mai-cang1)  ，JIA Meng-liu1) ，PENG Tao2) 1) School of Materials Science and Engineering，University of Science and Technology Beijing，Beijing 100083，China 2) General Ｒesearch Institute for Nonferrous Metals，Beijing 100088，China Corresponding author，E-mail: mczhang@ ustb． edu． cn ABSTＲACT The effects of cyclic heat treatment and hot deformation on the spheroidization and orientation of the TC17 titanium al￾loy were investigated using a light microscope ( LM) and electron backscattered diffraction ( EBSD) ． The experimental results indicate that in the two-phase temperature range of a simple，cycle heat treatment，the spheroidization of the lamellar microstructure of the TC17 titanium alloy is finite． After cyclic heat treatment and compression deformation，the Widmannstatten structure disappears，the spheroidized α lamellae is more obvious，but the uniformity of its orientation is not greatly improved． In addition，the recrystallization velocity，and the strength and toughness of the two phases in deformation lead to a difference in their orientation，and the recrystalliza￾tion velocity of the α phase is faster than that of the β phase． In the deformation process，the anisotropy of the α phase is preferentially reduced． On the other hand，during the hot deformation process，the degree of deformation of the α phase is lower than that of the β phase，because the α phase is harder than the β phase． The strain is primarily concentrated on the softer β phase adjacent to α phase， which produces greater uniformity in α phase than in the β phase． KEY WOＲDS TC17 alloy; thermal mechanical treatment; lamellar structure; spheroidization; orientation 收稿日期: 2017--04--25 TC17 合金是一种综合性能优良的富 β 相的 α + β 两相钛合金，具有较高的强度、淬透性和断裂韧性， 且热稳定性能、抗疲劳性能、热加工性能都较高，可 在 α + β 相区或 β 相区进行锻造［1--4］． TC17 合金主