紧固件用TC16钛合金强化热处理工艺研究
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摘要
利用光学显微镜、扫描电镜以及拉伸实验机,研究不同热处理工艺下TC16钛合金的显微组织及力学性能。结果表明:退火后的组织为等轴α+β,晶粒大小约为1μm;固溶处理的组织为初生α+α"+亚稳β,随着固溶温度的升高,初生α相减少,抗拉强度不随固溶温度的变化而变化,屈服强度较退火态下降较大,屈强比仅为0.4~0.47;时效处理后的组织为初生α+α+β,α、β呈片状相间分布于原始β晶粒内,时效处理后的抗拉强度最高可达1226MPa,强塑积最高达21834MPa·%;退火态与固溶态的拉伸断口为韧性断口,而时效处理后的拉伸断口为准解理断口。
Microstructure and mechanical properties of TC16 titanium alloy for fastener are studied by OM, SEM, and tensile testing machine. The results show that equiaxed α and β grains are observed at annealing treatment, of which the size is about 1μm. There are primary α +α" + metastable β phases after solution treatment. With the increase of solution temperature, the amount of primary α grains is decreased, tensile strength does not change at different solution temperatures, and the yield ratio is only 0.4~0.7. The primary α + α + β phases are observed at aging treatment, with lamellar α and β phase distributing in original β phase, and strength and product of strength and elongation are up to 1226 MPa and 21834MPa·% after aging treatment. The tensile fracture is tough break after annealing and solution treatment, which is quasi-cleavage fracture after aging treatment.
Microstructure and mechanical properties of TC16 titanium alloy for fastener are studied by OM, SEM, and tensile testing machine. The results show that equiaxed α and β grains are observed at annealing treatment, of which the size is about 1μm. There are primary α +α" + metastable β phases after solution treatment. With the increase of solution temperature, the amount of primary α grains is decreased, tensile strength does not change at different solution temperatures, and the yield ratio is only 0.4~0.7. The primary α + α + β phases are observed at aging treatment, with lamellar α and β phase distributing in original β phase, and strength and product of strength and elongation are up to 1226 MPa and 21834MPa·% after aging treatment. The tensile fracture is tough break after annealing and solution treatment, which is quasi-cleavage fracture after aging treatment.
引文
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[2]吴崇周,李兴无.TC16钛合金室温变形特性研究[J].钛工业进展,2006,23(6):17-19.WU Chongzhou,LI Xingwu.Study of deformation characters of TC16 titanium alloys under room temperature[J].Titanium Industry Progress,2006,23(6):17-19.
[3]吴崇周.热镦对TC16钛合金组织和性能的影响[J].宇航材料工艺,2007,37(3):61-64.WU Chongzhou.Effects of heat upset on structure and properties of TC16 titaniun alloy[J].Aerospace Materials&Technology,2007,37(3):61-64.
[4]张庆玲,王庆如,李兴无.航空用钛合金紧固件选材分析[J].材料工程,2007(1):11-14,18.ZHANG Qingling,WANG Qingru,LI Xingwu.Materials selection analysis for titanium alloy fasteners in aviation industry[J].Journal of Materials Engineering,2007(1):11-14,18.
[5]马琴琴,郑为为,李兴无.TC16钛合金不同退火制度的显微组织研究[J].材料工程,2009(1):19-22.MA Qinqin,ZHENG Weiwei,LI Xingwu.Microstructures of TC16 titanium alloy annealed at different conditions[J].Journal of Materials Engineering,2009(1):19-22.
[6]刘仁志,吴海荣,王华明.TC16钛合金六角自锁螺母加工技术研究[J].飞机设计,2011,31(3):51-54.LIU Renzhi,WU Hairong,WANG Huaming.The application of TC16 titanium self-lock hex nut critical technologies[J].Aircraft Design,2011,31(3):51-54.
[7]王勉,王自勤.TC16螺栓头下圆角滚压工艺参数与疲劳强度研究[J].贵州工业大学学报(自然科学版),2008,37(5):108-110.WANG Mian,WANG Ziqin.Rolling process parameter and fatigue strength of radius of fillet under TC16 bolt head[J].Journal of Guizhou University of Technology(Natural Science Edition),2008,37(5):108-110.
[8]邵军,陶海林,王农.热处理工艺对TC16钛合金棒材性能的影响[J].钛工业进展,2012,29(3):32-34.SHAO Jun,TAO Hailin,WANG Nong.Effect of heat treatment on mechanical property of TC16 bars[J].Titanium Industry Progress,2012,29(3):32-34.
[9]张志强,董利民,杨洋,等.淬火温度对TC16钛合金显微组织及变形行为的影响[J].金属学报,2011,47(10):1257-1262.ZHANG Zhiqiang,DONG Limin,YANG Yang,et al.Influences of quenching temperature on the microstructure and deformation behaviors of TC16 titanium alloy[J].Acta Metallurgica Sinica,2011,47(10):1257-1262.
[10]张翥,王群骄,莫畏.钛的金属学和热处理[M].北京:冶金工业出版社,2009:214-217.ZHANG Zhu,WANG Qunjiao,MO Wei.Physica matallurgy and heat treatment of titanium[M].Beijing:Metallurgical Industry Press,2009:214-217.