高温形变热处理对Ti5321合金组织和拉伸性能的影响  

Influence of high temperature thermo-mechanical treatment on structure and tensile properties of Ti5321 alloy

作　　者：赵英杰 辛社伟[2] 周伟[2] 李倩[2] 赵永庆[2] 毛小南[2] 周廉[1,2] ZHAO Ying-jie;XIN She-wei;ZHOU Wei;LI Qian;ZHAO Yong-qing;MAO Xiao-nan;ZHOU Lian(School of Materials Science and Engineering, Northwestern Polytechnical University, Xi＇ an 710072, China;Northwest Institute for Nonferrous Metal Research, Xi＇ an 710016, China)

机构地区：[1]西北工业大学材料学院,陕西西安710072 [2]西北有色金属研究院,陕西西安710016

出　　处：《材料热处理学报》2018年第4期37-43,共7页Transactions of Materials and Heat Treatment

基　　金：国家国际科技合作(2015DFA51430)

摘　　要：对新型高强高韧钛合金Ti-5321在两相区锻造后分别进行空冷和水淬,随后分别进行固溶时效、直接时效和二级时效处理,测试其室温拉伸性能,并采用X射线衍射、扫描电镜及透射电镜分析其相组成及显微组织。结果表明：经过固溶时效处理后,合金消除了锻后空冷及水淬组织的差异;水淬态直接时效的拉伸性能与水淬固溶时效态处于同一水平,其抗拉强度达到1239MPa,伸长率达到13%;水淬态预时效后试样塑性急剧降低,发生脆断,二级时效后,塑性显著提升;空冷态试样不论在直接时效还是二级时效后性能都没有明显提高。Mechanical property,phase composition and microstructure of high-strength high-toughness Ti-5321 titanium alloy treated by different cooling treatments（ air cooling and water quenching） and aging treatments（ solution and aging,direct aging and two-step aging）after α ＋ β forging were studied by means of tensile test,X-ray diffraction（ XRD）,scanning electron microscopy（ SEM） and transmission electron microscopy（ TEM）. The results show that after solid solution and aging treatment,the microstructure of the alloy after air cooling and water quenching has no difference. The tensile strength and elongation of the alloy after water quenching and direct aging reach to1239 MPa and 13%,respectively,which are comparable to those of solution and aging treated alloy. The plasticity of the alloy sharply decreases after water quenching and pre-aging,and significantly increases after two-step aging. The tensile properties of the alloy after air cooling are not obviously improved after direct aging or two-step aging.

关 键 词：高强高韧钛合金 高温形变热处理 拉伸性能 显微组织 

分 类 号：TG146.23[一般工业技术—材料科学与工程]