退火温度对激光熔化沉积TA15钛合金组织和性能的影响  

Effect of Annealing Temperatures on Microstructure and Mechanical Properties of Laser Melting Deposited TA15 Titanium Alloy

作　　者：谢旭霞[1] 张述泉[1] 汤海波[1] 李安[1] 方艳丽[1] 李鹏[1] 王华明[1] 

机构地区：[1]北京航空航天大学,北京100083

出　　处：《稀有金属材料与工程》2008年第9期1510-1515,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金资助项目(50625413)和(50331010)

摘　　要：采用激光熔化沉积工艺制备TA15钛合金棒材和板材。利用OM、SEM和TEM等方法研究退火温度对棒材组织和板材性能的影响。结果表明:激光熔化沉积TA15钛合金β晶粒具有十分优异的高温稳定性,在β相区长期退火,其β晶粒尺寸几乎无变化。激光熔化沉积成形态为典型的层片状β转变组织。在两相区上部退火,形成特殊的"双态"组织,初生α呈规则长条块状,其体积分数随退火温度的升高而降低。在β相区退火获得细层片状组织。在α+β两相区退火,随温度的升高,强度有下降趋势,塑性显著下降。TA15 bars and plates were fabricated by laser melting deposition manufacturing. The effect of annealing temperature on microstructure and mechanical properties of laser melting deposited TA15 alloy has been studied. The experimental results show β grains of the alloy has excellent high temperature stability. The microstructure of the as-deposited alloy is the typical lamellar transformed ft. A special bi-modal structure with regular stripe-shaped primary a is produced by annealing in the upper α＋β field, and volume fraction of the primary α decreases with the increasing annealing temperature. The microstructure of β annealing is fine lamellar transformed ft. The ultimate tensile strength of the plates declines because of the coarsening of primary a in α＋β field. The ultimate tensile strength and elongation are improved after annealing at 940 ℃, The ultimate tensile strength is unchanged but the elongation is a bit worse after β annealing.

关 键 词：TA15钛合金 激光熔化沉积 热处理 显微组织 力学性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]