热处理对激光沉积TC4/TC11组织和性能的影响
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摘要
通过对激光沉积TC4/TC11钛合金直接过渡件沉积态和热处理态的显微组织、静载力学性能、拉伸断口及显微硬度进行对比研究,探索改善激光沉积TC4/TC11钛合金组织,进而提高综合力学性能的途径。研究结果表明,沉积态试样在970℃热处理后α板条的长/宽比小于沉积态和退火态,两侧组织均呈现典型的网篮组织特征且更为均匀,晶界α相彻底消失,过渡界面基本消失,使得TC4/TC11组织参数最优化;沉积态、去应力退火和固溶时效(最优热处理参数)热处理后试样的拉伸断口为韧性断口且均断在了TC4侧,其中固溶时效热处理后试样强度没有明显降低,塑性得到显著提高,具有良好的综合力学性能;当热处理温度提高到970℃(最优热处理参数)时,该试样沿着整个过渡界面显微硬度值分布最均匀、差异最小,基体与过渡界面处显微硬度值变化也最小。
By comparing the microstructure, static mechanical properties, tensile fracture and microhardness of laser deposited TC4/TC11 titanium alloy direct transitional parts in the as-deposited and heat-treated states, the approaches to perfect the microstructure of laser deposition TC4/TC11 alloy so as to improve its integrated mechanical properties were explored. Results show that after the as-deposited sample undergoes 970 °C heat treatment, its length-width ratio of α laths is less than that of as-deposited and annealed samples. The microstructure on the two sides is featured by basket-weave structure and more even. In addition, the grain boundary α disappears entirely. There is almost no existence of transitive interface, which optimizes the textural parameters of TC4/TC11 titanium alloy. For all the as-deposited, relieved-stress annealed and solution aged samples(optimal heat treatment parameters), their tensile fractures are tough fracture and their fracture sections are all on the side of TC4 titanium alloys. Among them, the strength of solution aged sample is not reduced greatly. Moreover, its plasticity is remarkably enhanced.So it has excellent integrated mechanical properties. When the temperature of the heat treatment rises to 970 °C(optimal heat treatment parameters) microhardness of TC4/TC11 titanium alloys is uniform along the whole transitive interface with minimum differences. At the same time, microhardness changes most slightly on the matrix and transitive interface.
By comparing the microstructure, static mechanical properties, tensile fracture and microhardness of laser deposited TC4/TC11 titanium alloy direct transitional parts in the as-deposited and heat-treated states, the approaches to perfect the microstructure of laser deposition TC4/TC11 alloy so as to improve its integrated mechanical properties were explored. Results show that after the as-deposited sample undergoes 970 °C heat treatment, its length-width ratio of α laths is less than that of as-deposited and annealed samples. The microstructure on the two sides is featured by basket-weave structure and more even. In addition, the grain boundary α disappears entirely. There is almost no existence of transitive interface, which optimizes the textural parameters of TC4/TC11 titanium alloy. For all the as-deposited, relieved-stress annealed and solution aged samples(optimal heat treatment parameters), their tensile fractures are tough fracture and their fracture sections are all on the side of TC4 titanium alloys. Among them, the strength of solution aged sample is not reduced greatly. Moreover, its plasticity is remarkably enhanced.So it has excellent integrated mechanical properties. When the temperature of the heat treatment rises to 970 °C(optimal heat treatment parameters) microhardness of TC4/TC11 titanium alloys is uniform along the whole transitive interface with minimum differences. At the same time, microhardness changes most slightly on the matrix and transitive interface.
引文
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[2]Ganesh P,Kaul R,Paul C P et al.Materials Science and Engineering[J],2010,527(29-30):98
[3]Dinda G P,Dasgupta A K,Mazumder J.Materials Science and Engineering[J],2009,509(1-2):98
[4]Wang Weifu,Wang Maocai,Zhang Jie et al.Optics and Lasers in Engineering[J],2008,46(11):810
[5]Chen Jing(陈静),Zhang Qiang(张强),Liu Yanhong(刘彦红)et al.Chinese J Lasers(中国激光)[J],2011,38(6):603 022
[6]Chen Jing(陈静),Jiang Guozheng(姜国政),Lin Xin(林鑫)et al.Chinese J Lasers(中国激光)[J],2010,37(2):593
[7]Lin X,Yue T M,Yang H O et al.Acta Materialia[J],2006,54(7):1901
[8]Xue Lei(薛蕾),Chen Jing(陈静),Lin Xin(林鑫)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2007,36(6):989
[9]Huang Boyun(黄伯云),Li Chenggong(李成功),Shi Likai(石力开)et al.China Materials Engineering Canon(中国材料工程大典)[M].Beijing:Chemical Industry Press,2006:471
[10]Banlisunwa E A.Translated by Chen Shiqing(陈石卿).Titanium Metallography(钛合金金相学)[M].Beijing:National Defense Industry Press,1986
[11]Lin X,Yue T M,Yang H O et al.Materials Science and Engineering A[J],2005,391(1-2):325
[12]Liu Jiantao(刘建涛),Lin Xin(林鑫),Lv Xiaowei(吕晓卫)et al.Acta Metallurgica Sinica(金属学报)[J],2008,44(8):1006
[13]Xu Xiaojing(许小静),Lin Xin(林鑫),Yang Mocong(杨模聪)et al.Acta Metallurgica Sinica(金属学报)[J],2008,44(8):1013
[14]Gil F J,Ginebra M P,Manero J M.Journal of Alloys and Compounds[J],2001,392(1-2):142
[15]Xin Shewei(辛社伟),Zhao Yongqing(赵永庆),Zeng Weidong(曾卫东).Titanium Industry Progress(钛工业进展)[J],2008,25(3):26
[16]Xin Shewei(辛社伟),Zhao Yongqing(赵永庆).Heat Treatment of Metals(金属热处理)[J],2006,31(9):39