热变形参数对TC25合金β锻坯微观组织和拉伸性能的影响  

Influence of hot forming parameters on microstructure and tensile properties of alloy TC25 forging β

作　　者：张晓园[1] 马驰 史小云[1] 王晓亮[1] 杜予晅[1] 李少强[1] 雷锦文[1] 杜建超[1] 

机构地区：[1]西部超导材料科技股份有限公司陕西省航空材料工程实验室,陕西西安710018 [2]中航商用航空发动机有限公司,上海201108

出　　处：《锻压技术》2015年第11期117-121,共5页Forging & Stamping Technology

基　　金：国家国际科技合作专项(2013DFR50090);陕西省科技统筹创新工程计划项目(2013KTLM-01)

摘　　要：研究了β锻造时不同变形参数下、TC25合金的微观组织演变过程及拉伸性能变化规律。结果表明,随变形量的增大,微观组织由取向一致的魏氏组织逐渐转变为杂乱交织的网篮组织;随变形温度的升高锻件组织分别为三态组织、网篮组织,最后为取向一致的α片束状组织,组织不均匀性急剧增大,出现断续晶界α或连续晶界α及大块α组织。其中三态组织、无序杂乱的网篮组织及少量的晶界α和大块α组织有利于提高合金锻件的高温拉伸强度。为了获得具有优良高温强度的合金锻件,变形参数有两个可选范围：一是变形温度在Tβ＋15℃左右、变形量35%-50%;另一是变形温度在Tβ＋35℃左右、变形量45%-60%。The microstructure evolution and tensile properties of alloy TC25 were conducted at different deformation parameters in β region. The experimental results show that Widmanstaten microstructure transforms into a lamellar microstructure with the increase of deformation degree. Furthermore,with the increase of deformation temperature,the microstructure changes from three states microstructure to lamellar microstructure. Finally,it becomes α sheet bundle microstructure of consistent orientation and inhomogeneity of microstructure increases suddenly and appears intermittent or continuous α grain boundary and bulk α. The above microstructures are beneficial to improve the high temperature tensile strength of the alloy forging. In order to obtain a better alloy forging of high temperature tensile strength,there are two optional ranges for the deformation parameters,one is deformation temperature around Tβ＋ 15 ℃ with the deformation degree within 35%-50%,the other is the deformation temperature around Tβ＋ 35 ℃ with the deformation degree within 45%-60%.

关 键 词：TC25合金 Β锻造 变形参数 微观组织 拉伸性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG319[金属学及工艺—金属材料]