第25卷第1期 2017年2月
材料科学与工艺
MATERIALS SCIENCE & TECHNOLOGY
D0I:10.11951/j.issn.1005-0299.20160224
Vol.25No. 1 Feb.2017
热处理对Ti-6AI-2.5V-1.5Fe-0.150合金组织及
力学性能的影响
王亮1吴晓明2王富鑫1骆良顺1，苏彦庆1，史亚鸣3郭景杰，傅恒志（1.金属精密热加工国家级重点实验室（哈尔滨工业大学），哈尔滨150001；2.西安航天发动机厂，西安710100；
3.云南省钛材应用产品工程技术研究中心，云南楚雄651209）
摘要：以真空非自耗电弧炉制备的低成本Ti-6A1-2.5V-1.5Fe=0.150合金为对象，研究了不同冷却速率下固溶及时效温度对合金组织及性能的影响，发现固溶温度主要影响初生α相的含量.固溶冷却方式影响α的类型.单相区固溶时，初生α相消失，β 晶粒内出现α片层集束，固溶萍火组织主要由残余未转变的β相以及针状的α；随着固溶温度的升高，针状马氏体α'相增多；两相区固溶后，时效组织均有固溶时产生的α相、时效α相以及残留的β相.时效温度较低时，α相形核能较低，元素扩散困难，需借助过饱和β相析出弥散相形核，因而针状α相细小而弥散；时效温度升高，α相形核以及长大驱动力大，时效α相易长大变
粗.经固溶时效处理，合金强度随着温度升高先小幅升高后显著降低，塑性先增大后因晶界粗化以及粗片状α集束而降低关键词：Ti合金；固溶温度；时效温度；合金组织；力学性能
中图分类号：TG146.2
文献标志码：A
文章编号：1005-0299(2017)01-0010-06
Effect of heat treatment on microstructure and mechanical property of
Ti-6Al-2.5V-1.5Fe-0.150 alloy
WANG Liang', WU Xiaoming ,WANG Fuxin', LUO Liangshun', SU Yanqing , SHI Yaming , GUO Jingjie', FU Hengzhi( 1.National Key Laboratory for Precision Hot Processing of Metals( Harbin Institute of Technology) , Harbin 150001, China ;
2.Xi'an Space Engine Factory, Xi'an 710100, China; 3.Engineering Technology Research Center of
Titanium Products and Application of Yunnan Province, Chuxiong 651209, China)
Abstract : The effect of solid solution temperature and aging temperature in different cooling rates on microstructure and mechanical properties of Ti6Al-2.5V1.5Fe-0.150 alloy prepared by vacuum non-consumable arc melting process was studied. It was found that solid solution temperature mainly affects the content of primary cx, and the type of solid solution cooling method has important effect on the type of primary α. Aging temperature will change the morphology of aging c phase. When the single phase zone is in solid solution, primary α phase disappears. The structure of the alloy after solid solution quenching is mainly composed of the residual phase and the needle like c'. With the increase of solid solution temperature, the needle like o' increases. After solid solution in the two phase region, α phase, aging cx phase and residual β phase all exist. At lower aging temperature, nuclear power and element diffusion α phase is lower. By means of saturated β phase precipitated nucleation, acicular oα phase is fine and dispersive. With increase of aging temperature, nucleation energy of o phase is larger. Aging phase is easy to grow up. After solution-aging treatment, the strength of the alloy increases slightly firstly and then decreases with increase of temperature. Plasticity firstly increases and then decreases due to grain boundary coarsening and coarse lamellar α cluster.
Keywords : Ti alloy; solution temperature;aging temperature;microstructure;mechanical property
收稿日期：2016-07-11.
网络出版时间：2017-01-05
基金项目：云南省省院省校科技合作专项项目（2013IB006）；国
家自然科学基金资助（51425402,51331005），
作者简介：王亮（1981一），男，博士，副教授：
苏彦庆（1969一），男，教授，博土生导师，长江学者特聘教授：郭景杰（1956一），男，教授，博士生导师：
傅恒志（1929一），男，教授，博士生导师，中国工程院院土
通信作者：整据ail：luols@hit.edu.cn.
钛合金具有比强度高、耐腐蚀、综合力学性能优异等特点有着广阔的应用前景[1-3].经过国内外多年的研究[4-5]，目前钛合金已有多种成熟的合金体系[6-9]，通过成分控制提高合金的综合性能已越来越困难，较多的研究开始关注其制备工