Effects of Heat Treatment on Microstructure, Mechanical Properties, and Anisotropy of Laser Melting Deposited TC4

Puqiang Wang; Yuyue Wang; Mengjie Wu; Zhen Dou; Anfeng Zhang

doi:10.3788/CJL202148.1002116

Chinese Journal of Lasers, Volume. 48, Issue 10, 1002116(2021)

Effects of Heat Treatment on Microstructure, Mechanical Properties, and Anisotropy of Laser Melting Deposited TC4

Puqiang Wang¹, Yuyue Wang¹, Mengjie Wu², Zhen Dou¹, and Anfeng Zhang^2、*

Author Affiliations

¹State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China

²State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710054, China.

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Figures & Tables(12)

Fig. 1. Microstructures of laser melting deposited TC4 alloy. (a)(b)(c) Parallel to deposition direction; (d)(e) perpendicular to deposition direction

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Fig. 2. Microstructures of laser melting deposited TC4 alloy after single solution aging treatment. (a)(b) HT1; (c)(d) HT2; (e)(f) HT3; (g)(h) HT4

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Fig. 3. Microstructures of laser melting deposited TC4 alloy after double solution aging and solution aging + annealing treatment. (a)(b) HT5; (c)(d) HT6; (e)(f) HT7; (g)(h) HT8

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Fig. 4. Element mapping of laser melting deposited TC4 alloy after HT5 heat treatment.(a) SEM image; (b)Al element mapping;(c)V element mapping

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Fig. 5. XRD patterns of laser melting deposited TC4 samples in different states

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Fig. 6. Vickers microhardness of laser melting deposited TC4 alloy samples in different states

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Fig. 7. Vickers hardness indentation photos of laser melting deposited TC4 specimens in different states (400×). (a) HT1; (b) HT2; (c) HT3; (d) HT4; (e) HT5; (f) HT6; (g) HT7; (h) HT8; (i) laser melting deposition

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$Tensile fracture morphologies of laser melting deposited TC4 specimens in different states. (a)(b) LMD-V; (c)(d) LMD-H; (e)(f) HT2-V; (g)(h) HT2-H; (i)(j) HT5-V; (k)(l) HT5-H; (m)(n) HT8-V; (o)(p) HT8-H$

Fig. 8. Tensile fracture morphologies of laser melting deposited TC4 specimens in different states. (a)(b) LMD-V; (c)(d) LMD-H; (e)(f) HT2-V; (g)(h) HT2-H; (i)(j) HT5-V; (k)(l) HT5-H; (m)(n) HT8-V; (o)(p) HT8-H

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$Microscopic morphologies of the longitudinal section of the fracture of laser melting deposited TC4 tensile specimen. (a) LMD-V; (b) LMD-H$

Fig. 9. Microscopic morphologies of the longitudinal section of the fracture of laser melting deposited TC4 tensile specimen. (a) LMD-V; (b) LMD-H

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Table 1. Chemical composition of TC4 alloy powder
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Table 1. Chemical composition of TC4 alloy powder
Element Fe N O C H Al V Ti
Mass fraction /% 0.076 0.011 0.14 0.0069 0.0017 6.32 4.06 Bal.

Table 2. Heat treatment processes of laser melting deposited TC4 alloy

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Table 2. Heat treatment processes of laser melting deposited TC4 alloy

No.	Heat treatment process
HT1	920 ℃/1 h/AC+550 ℃/4 h/AC
HT2	950 ℃/1 h/AC+550 ℃/4 h/AC
HT3	980 ℃/1 h/AC+550 ℃/4 h/AC
HT4	980 ℃/2 h/AC+550 ℃/4 h/AC
HT5	HT3 process+ HT3 process
HT6	HT3 process+ HT2 process
HT7	HT3 process+ HT1 process
HT8	HT3 process+800 ℃/2 h/FC

Table 3. Mechanical properties of laser melting deposited TC4 alloy tensile specimens in different states(D means tensile direction, σ_bmeans ultimate tensile strength, σ_s means yield strength, A means anisotropy, E means elongation, and R means rate of reduction in area)

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Table 3. Mechanical properties of laser melting deposited TC4 alloy tensile specimens in different states(D means tensile direction, σ_bmeans ultimate tensile strength, σ_s means yield strength, A means anisotropy, E means elongation, and R means rate of reduction in area)

Treatment	D	σ_b		σ_s		E		R
Treatment	D	Mean /MPa	A /%	Mean /MPa	A /%	Mean /%	A /%	Mean /%	A /%
LMD	H	1065.2	0.1	965.6	2.1	10.6	31.2	29.8	32.3
LMD	V	1066.0	0.1	945.4	2.1	15.4	31.2	44.0	32.3
HT2	H	1024.0	2.4	928.0	5.1	12.8	25.1	33.7	36.5
HT2	V	999.0	2.4	881.0	5.1	17.1	25.1	53.0	36.5
HT5	H	990.4	0.5	882.2	3.9	14.9	11.3	36.0	8.6
HT5	V	995.2	0.5	847.6	3.9	16.8	11.3	39.4	8.6
HT8	H	967.4	1.1	875.2	6.2	15.3	15.9	38.8	16.0
HT8	V	956.6	1.1	821.8	6.2	18.2	15.9	46.2	16.0
GB/T25137—2010	--	895.0	--	828.0	--	10.0	--	25.0	--

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Puqiang Wang, Yuyue Wang, Mengjie Wu, Zhen Dou, Anfeng Zhang. Effects of Heat Treatment on Microstructure, Mechanical Properties, and Anisotropy of Laser Melting Deposited TC4[J]. Chinese Journal of Lasers, 2021, 48(10): 1002116

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Paper Information

Category: Laser Material Processing

Received: Sep. 7, 2020

Accepted: Dec. 11, 2020

Published Online: May. 18, 2021

The Author Email: Zhang Anfeng (zhangaf@mail.xjtu.edu.cn)

DOI:10.3788/CJL202148.1002116

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Chemical composition of TC4 alloy powder

Table 1. Chemical composition of TC4 alloy powder

Table 2. Heat treatment processes of laser melting deposited TC4 alloy

Table 2. Heat treatment processes of laser melting deposited TC4 alloy

Table 3. Mechanical properties of laser melting deposited TC4 alloy tensile specimens in different states(D means tensile direction, σb means ultimate tensile strength, σs means yield strength, A means anisotropy, E means elongation, and R means rate of reduction in area)

Table 3. Mechanical properties of laser melting deposited TC4 alloy tensile specimens in different states(D means tensile direction, σb means ultimate tensile strength, σs means yield strength, A means anisotropy, E means elongation, and R means rate of reduction in area)

Table 3. Mechanical properties of laser melting deposited TC4 alloy tensile specimens in different states(D means tensile direction, σ_bmeans ultimate tensile strength, σ_s means yield strength, A means anisotropy, E means elongation, and R means rate of reduction in area)

Table 3. Mechanical properties of laser melting deposited TC4 alloy tensile specimens in different states(D means tensile direction, σ_bmeans ultimate tensile strength, σ_s means yield strength, A means anisotropy, E means elongation, and R means rate of reduction in area)