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激光沉积TA15钛合金退火处理工艺及网篮组织变形机制研究
引用本文:杨 光,王文东,钦兰云,任宇航,李长富,王 维.激光沉积TA15钛合金退火处理工艺及网篮组织变形机制研究[J].稀有金属材料与工程,2017,46(7):1935-1942.
作者姓名:杨 光  王文东  钦兰云  任宇航  李长富  王 维
作者单位:沈阳航空航天大学 航空制造工艺数字化国防重点学科实验室,沈阳航空航天大学 航空制造工艺数字化国防重点学科实验室,沈阳航空航天大学 航空制造工艺数字化国防重点学科实验室,沈阳航空航天大学 航空制造工艺数字化国防重点学科实验室,沈阳航空航天大学 航空制造工艺数字化国防重点学科实验室,沈阳航空航天大学 航空制造工艺数字化国防重点学科实验室
基金项目:国家自然科学(51505301,51305280,51375316);国家重点研发计划项目(2016YFB1100500-04)
摘    要:以TA15钛合金球形粉末为原料,采用激光沉积制造技术制备TA15钛合金厚壁件。通过光学显微镜(OM)、扫描电子显微镜(SEM)等方法研究了α+β两相区退火处理对TA15钛合金室温拉伸性能和显微组织的影响,并对网篮组织在拉伸过程中的变形机制进行讨论。结果表明:经α+β两相区不同温度退火后,显微组织为网篮组织或近网篮组织,退火温度对α相的形貌尺寸具有明显影响;退火后力学性能仍表现出方向上的各向异性:沉积方向上强度较低,塑性较好,而垂直沉积方向上强度高,塑性较差;粗大的层间区组织滑移变形具有“开路”作用,而柱状晶晶界对α相的滑移产生一种“固定”作用;显微硬度值随退火温度升高变化不大,显微硬度值受α相含量影响;网篮组织中的α片层组织在应力的作用下由原来近似正交方向逐渐向近似平行于应力方向变形,α片层组织的交错排列导致滑移变形时互相产生阻力;α+β两相区退火处理后的两种方向上断口形貌相似,断裂方式相同,均为韧性断裂。

关 键 词:激光沉积制造  α+β两相区  退火处理  显微组织  力学性能
收稿时间:2016/7/26 0:00:00
修稿时间:2016/11/8 0:00:00

Study on Annealing Treatment and Basketweave Structure Deformation Mechanism of Laser Deposition Manufacturing TA15 Titanium Alloy
Yang Guang,Wang Wendong,Qin Lanyun,Ren Yuhang,Li Changfu and Wang Wei.Study on Annealing Treatment and Basketweave Structure Deformation Mechanism of Laser Deposition Manufacturing TA15 Titanium Alloy[J].Rare Metal Materials and Engineering,2017,46(7):1935-1942.
Authors:Yang Guang  Wang Wendong  Qin Lanyun  Ren Yuhang  Li Changfu and Wang Wei
Affiliation:Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process,Shenyang Aerospace University,Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process,Shenyang Aerospace University,Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process,Shenyang Aerospace University,Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process,Shenyang Aerospace University,Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process,Shenyang Aerospace University,Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process,Shenyang Aerospace University
Abstract:TA15 titanium alloy bulk specimens were prepared by spherical powder in the way of laser deposition manufacturing. The effect of alpha plus beta phase zone annealing treatment on mechanical properties, microstructure of laser deposition manufacturing TA15 titanium alloy and lamellar deformation mechanism has been studied by optical microstructure (OM) and scanning electron microscopy (SEM). The experimental results showed that microstructure was basketweave structure or near basketweave structure after alpha plus beta phase zone annealing treatment, pattern and size of alpha phase was affected effectively by annealing temperature. The mechanical properties after annealing still showed the anisotropy in the different direction: the strength was low and the plasticity was high in deposition direction and the strength was high and the plasticity was low in vertical deposition direction. The interlayer binding zone slip deformation played a vanguard role and the columnar crystal grain boundary had bound effect on alpha phase slip deformation. Microhardness was effected by the amount of alpha phase while it changed little with the increase of annealing temperature. Alpha lamellar in basketweave structure under the stress changed from near orthogonal to near parallel to the direction of stress, staggered arrangement of alpha lamellar generating resistance each other when it was in the state of slip deformation. Both deposition direction and vertical deposition direction had same tensile fracture modes which was ductile fracture after alpha plus beta phase zone annealing treatment.
Keywords:laser deposition manufacturing  alpha plus beta phase zone  annealing treatment  microstructure  mechanical properties
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