Ti-1300钛合金挤压管材组织性能研究  

Microstructures and Mechanical Properties of Ti-1300 Titanium Alloy Extruded Tubes

作　　者：戚运莲[1] 辛社伟[1] 杜宇 曾立英[1] 刘伟[1] 孙花梅 谭伟力 谢翀博[1] 孙宝红 QI Yunlian;XIN Shewei;DU Yu;ZENG Liying;LIU Wei;SUN Huamei;TAN Weili;XIE Chongbo;SUN Baohong(Northwest Institute for Nonferrous Metal Research,Xi'an 710016,China)

机构地区：[1]西北有色金属研究院

出　　处：《有色金属材料与工程》2019年第4期6-12,共7页Nonferrous Metal Materials and Engineering

摘　　要：通过室温拉伸测试和显微组织观察,研究了挤压温度和热处理工艺对Ti-1300钛合金挤压管材显微组织和力学性能的影响,讨论了热加工工艺、显微组织和力学性能之间的关系。结果表明:Ti-1300钛合金在两相区挤压后的横向组织均匀细小,纵向组织沿挤压加工流线破碎均匀;其拉伸强度高达1445MPa。管材在相变点以上的高温固溶组织主要由等轴β相晶粒组成,具有较好的塑性。合金两相区挤压后具有较好的强度和塑性的匹配,两相区挤压的塑性明显优于β单相区挤压,尤其面缩。试样经过固溶时效处理后显微组织明显细化,强度大幅度提高,可达1300MPa以上。The effects of extrusion temperature and heat treatment process on the microstructures and mechanical properties of Ti-1300 titanium alloy tube billet were studied by tensile testing and microstructure observation.The relationships among the thermal processing technique,microstructures and mechanical properties were discussed.The results show that Ti-1300 titanium alloy after extruding at two-phase region exhibits homogeneous and fine transverse structures and uniform crushed extrusion processing streamline observed in longitudinal structures.The tensile strength is up to 1 445 MPa.The structure of the tube obtained by high temperature solid solution above the phase transition point is mainly composed of equiaxed β phase grains with good plasticity.The two-phase extruded alloy shows good match of strength and plasticity.The plasticity of the two-phase extruded alloy is obviously greater than that of the single-phase extruded one,especially in section contraction.The microstructures of the specimen are refined obviously after solution and aging treatment,and the strength is greatly improved and reaches more than 1 300 Mpa.

关 键 词：Ti-1300钛合金 挤压温度 挤压管材 热处理 组织性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]