低成本TC4钛合金板材的组织和性能  

Microstructure and properties of low cost TC4 titanium alloy sheet

作　　者：冯秋元[1,2] 张磊[2] 庞洪[2] 张平辉[1,2] 佟学文[1,2] 王鼎春[1,2] 高颀[1,2] 

机构地区：[1]宝钛集团有限公司宝钛研究院,陕西宝鸡721014 [2]宝鸡钛业股份有限公司板带厂,陕西宝鸡721014

出　　处：《金属热处理》2016年第6期85-88,共4页Heat Treatment of Metals

基　　金：国家高技术研究发展计划(863计划)(2013AA09A108)

摘　　要：研究了低成本TC4钛合金板材在变形及退火过程中组织和性能的变化规律。结果表明：板坯经轧制变形后,粗大的铸态枝晶组织被破碎,形成了等轴或长条状α＋β转变组织。板材退火后,其组织更加均匀,且随着退火温度升高,板材中析出片状次生α相,初生α相的含量减少,并逐渐趋于等轴化。随变形进行,板材的室温拉伸强度和塑性呈增大趋势;退火温度升高,板材的抗拉强度先增大,至820℃时达到最大值,之后逐渐减小,规定塑性延伸强度和断面收缩率总体上呈下降趋势,而伸长率则变化不大。经（750~820）℃×1 h＋AC退火处理后的板材,具有较好的强度与塑性的匹配。Changing law of microstructure and mechanical properties of low cost TC4 titanium alloy sheet during deformation and annealing was investigated. The results show that the coarse cast dendritic structure of slab is broken to form equiaxed or long-strip-like α ＋ β transformed microstructure by rolling deformation. After annealing, the microstructure of sheet becomes uniform, moreover, the flake secondary α separates out and the amount of primary α phase decreases and gradually tends to equiaxization with the increase of annealing temperature. The tensile strength and ductility of sheet show an increased tendency with deforming. When annealing temperature raises, the tensile strength firstly increases and reaches the maximum value at 820 ℃, and then gradually decreases. The yield strength and reduction of area show decreasing trend as a whole, while the elongation changes a little. The sheet has preferable matching of strength and ductile after annealing at 750-820 ℃ for 1 h and then cooling in air.

关 键 词：TC4钛合金板材 退火 组织 力学性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]