Effects of Scanning Strategy on the Microstructure, Properties, and Residual Stress of TC4 Titanium Alloy Prepared by Laser Melting Deposition

Qibo Shan; Chen Liu; Jing Yao; Yu Zhan; Changsheng Liu

doi:10.3788/LOP202158.1114002

Laser & Optoelectronics Progress, Volume. 58, Issue 11, 1114002(2021)

Effects of Scanning Strategy on the Microstructure, Properties, and Residual Stress of TC4 Titanium Alloy Prepared by Laser Melting Deposition

Qibo Shan¹, Chen Liu¹, Jing Yao¹, Yu Zhan², and Changsheng Liu^1、*

Author Affiliations

¹Key Laboratory of Material Anisotropy and Texture of Ministry of Education, School of Materials Science and Engineering, Northeastern University, Shenyang , Liaoning 110819, China

²Department of Mechanics, School of Science, Northeast University, Shenyang , Liaoning 110819, China

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Figures & Tables(13)

Fig. 1. SEM image of TC4 powder

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Fig. 2. Schematic of each scanning strategy. (a) Reciprocating scanning; (b) unidirectional scanning; (c) roundabout scanning; (d) partition roundabout scanning

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Fig. 3. Schematic of tensile specimen sampling along different directions. (a) Parallel direction; (b) perpendicular direction

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Fig. 4. Schematic of size of tensile specimen

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Fig. 5. Test sample and layout of measuring points

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Fig. 6. Macrostructures of XOZ plane by various scanning strategies. (a) Reciprocating scanning; (b) unidirectional scanning; (c) roundabout scanning; (d) partition roundabout scanning

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Fig. 7. Microstructure of XOZ plane by various scanning strategies

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Fig. 8. XRD patterns of TC4 titanium alloy samples produced by LMD using different scanning strategies

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Fig. 9. Comparison of residual stress values of samples using different scanning strategies

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Fig. 10. Residual stress detection results of four scanning strategies. (a) Reciprocating scanning; (b) unidirectional scanning; (c) roundabout scanning; (d) partition roundabout scanning

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Table 1. Chemical composition of TC4 powder
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Table 1. Chemical composition of TC4 powder
Element Ti V Al C Fe
Theoretical mass fraction /% Bal. 3.5-4.5 5.5-6.75 <0.08 <0.3
Measured mass fraction /% Bal. 3.82 5.83 0.023 0.068

Table 2. Tensile mechanical properties of laser melt-deposited TC4 titanium alloy

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Table 2. Tensile mechanical properties of laser melt-deposited TC4 titanium alloy

Tensile test direction	Scanning strategy	Tensile strength /MPa	Yield strength /MPa	Elongation /%
Parallel to deposition direction	Reciprocating scanning	998.8	1017.0	13.2
Perpendicular to deposition direction	Reciprocating scanning	1116.8	1124.0	6.8
Parallel to deposition direction	Unidirectional scanning	991.5	1010.9	12.0
Perpendicular to deposition direction	Unidirectional scanning	1043.5	1048.2	4.7
Parallel to deposition direction	Roundabout scanning	1080.0	1023.3	10.3
Perpendicular to deposition direction	Roundabout scanning	1251.7	1250.0	3.6
Parallel to deposition direction	Partition roundabout scanning	1088.3	1036.7	11.9
Perpendicular to deposition direction	Partition roundabout scanning	1156.7	1170.0	3.2

Table 3. Residual stress values of samples using different scanning strategies
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Table 3. Residual stress values of samples using different scanning strategies
Measuring position Mean stress value /MPa
Reciprocating scanning Unidirectional scanning Roundabout scanning Partition roundabout scanning
Top 41.2 127.4 119.8 64.8
Middle 19.2 68.2 50.8 15.4
Bottom -56.0 136.2 29.2 -4.2

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Qibo Shan, Chen Liu, Jing Yao, Yu Zhan, Changsheng Liu. Effects of Scanning Strategy on the Microstructure, Properties, and Residual Stress of TC4 Titanium Alloy Prepared by Laser Melting Deposition[J]. Laser & Optoelectronics Progress, 2021, 58(11): 1114002

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