Effect of Composition Gradient on Microstructure and Properties of Laser Deposition TC4/TC11 Interface

doi:10.11900/0412.1961.2018.00496

Acta Metall Sin

2019, Vol. 55

Issue (10): 1251-1259 DOI: 10.11900/0412.1961.2018.00496

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Effect of Composition Gradient on Microstructure and Properties of Laser Deposition TC4/TC11 Interface

HE Bo¹,XING Meng¹,YANG Guang²(

),XING Fei³,LIU Xiangyu⁴

1. School of Mechatronics Engineering, Shenyang Aerospace University, Shenyang 110136, China
2. Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process, Shenyang Aerospace University, Shenyang 110136, China
3. Liaoning Additive Manufacturing Industry Technology Research Institute Co. , Ltd. , Shenyang 110021, China
4. Shenyang Zhongke Yuchen Technology Co. , Ltd. , Shenyang 110021, China

Cite this article:

HE Bo, XING Meng, YANG Guang, XING Fei, LIU Xiangyu. Effect of Composition Gradient on Microstructure and Properties of Laser Deposition TC4/TC11 Interface. Acta Metall Sin, 2019, 55(10): 1251-1259.

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Abstract

In recent years, gradient composites have been increasingly used in life and industry. The rapid development of laser deposition manufacturing (LDM) technology realizes the manufacturing of dissimilar-metal gradient composite structure used for main bearing component. In this work, laser deposited TC4/TC11 gradient composite structures are taken as the research objects. Since there are few studies on TC4/TC11 titanium alloy, this work focuses on the effect of heat treatment on the microstructures and properties of TC4/TC11 titanium alloy, providing the basis to improve the quality and serving life of laser deposited gradient composite structure. Based on comparative study on the microstructures, residual static performances, tensile fractures, room temperature abrasion results and microhardnesses of laser deposition TC4/TC11 titanium alloy specimens with different composition gradients under different heat treatments, the ways to improve the laser deposition TC4/TC11 titanium alloy microstructure and the comprehensive mechanical properties were explored. Results show that when the temperature of solution and ageing treatment rises to 970 ℃, the length-width ratio of α laths of TC4/TC11 titanium alloy is less than that of the other heat treatment samples. The globular α phase and the short bar α phase are significantly increased. The microstructure of the three-layer transition zone is more uniform and orderly, and the transition interface almost disappears. With the increase of the number of transition layers, the strength and plasticity of solution and ageing samples with different component gradients are increased. The frictional coefficient curve of sample with 1 transition layer is similar to that of the sample with 3 transition layers. The friction coefficient of the sample with the transition layer of 0 is relatively small. The wear mechanism of solution and ageing samples with different component gradients are mainly lamination wear and adhesive wear. From the as-deposited state to the stress relieved and finally to the ageing state of solid solution, the corresponding hardness of the sample with different component gradients increases successively.

Key words: laser deposition manufacturing titanium alloy heat treatment microstructure property

Received: 01 November 2018

ZTFLH:

TG146.2

Fund: National Key Research and Development Program of China(2018YFB1105805);National Key Research and Development Program of China(2017YFB1104002);Civil Aircraft Special Scientific Research Project of Ministry of Industry and Information Technology(MJZ-2016-G-71);Scientific Research Project of Liaoning Provincial Department of Education(L201738);Open Fund of Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process(SHSYS2017007)

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	Bo HE
	Meng XING
	Guang YANG
	Fei XING
	Xiangyu LIU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00496 OR https://www.ams.org.cn/EN/Y2019/V55/I10/1251

Table 1 Chemical compositions of TC4 and TC11 alloys

Table 2 Compositions of each layer for three transition layers sample

Table 3 Heat treatment processes

Fig.1 Schematic of tensile sample sampling

Fig.2 OM (a, c~f) and SEM (b) images of laser deposition manufacturing TC4/TC11 alloys with 0 transition layer under heat treatment processes of No.1 (a, b), No.2 (c), No.3 (d), No.4 (e) and No.5 (f) (Curves show the TC11/TC4 interfaces)

Fig.3 OM images of laser deposition manufacturing TC4/TC11 alloys with 1 transition layer under heat treatment processes of No.1 (a), No.2 (b), No.3 (c), No.4 (d) and No.5 (e)

Fig.4 OM images of laser deposition manufacturing TC4/TC11 alloys with 3 transition layers under heat treatment processes of No.1 (a), No.2 (b), No.3 (c), No.4 (d) and No.5 (e)

Table 4 Room temperature tensile properties of solution-ageing TC4/TC11 alloys with different transition layers

Fig.5 OM images of tensile fracture sections of solution-ageing treated TC4/TC11 alloys with transition layers 0 (a), 1 (b) and 3 (c)

Fig.6 Low (a1~c1) and locally high (a2~c2) magnified tensile fracture SEM images of solution-ageing treated TC4/TC11 alloys with transition layers 0 (a1, a2), 1 (b1, b2) and 3 (c1, c2)

Fig.7 Friction coefficient curves of solution-ageing TC4/TC11 titanium alloys with different transition layers

Fig.8 Wear morphologies of solution-ageing TC4/TC11 titanium alloys with transition layers 0 (a), 1 (b) and 3 (c)

Fig.9 EDS analyses of TC4/TC11 with transition layers 0 (a), 1 (b) and 3 (c)

Table 5 Average micro-hardnesses of TC4/TC11 titanium alloys with different transition layers under different heat treatments

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