Effects of Laser Process Parameters on Residual Stress of Pure Titanium Samples Prepared by Laser Melting Deposition

Hongji Sun; Jing Wei; Zhaohong Zheng; Dechuang Zhang; Jianguo Lin

doi:10.3788/CJL201946.0302014

Chinese Journal of Lasers, Volume. 46, Issue 3, 0302014(2019)

Effects of Laser Process Parameters on Residual Stress of Pure Titanium Samples Prepared by Laser Melting Deposition

Hongji Sun^1、*, Jing Wei¹, Zhaohong Zheng¹, Dechuang Zhang², and Jianguo Lin^1、*

Author Affiliations

¹ School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan 411105, China

² Provincial Key Laboratory for Material Design and Fabrication, Xiangtan University, Xiangtan, Hunan 411105, China

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Figures & Tables(10)

Fig. 1. Model for laser melting deposition of pure titanium component

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Fig. 2. Schematic of dimension and shape of sample to be tested

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Fig. 3. Residual stress distributions along different directions. (a) Horizontal direction; (b) height direction

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Fig. 4. Residual stress versus laser power under different directions. (a) Horizontal direction; (b) height direction

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Fig. 5. Residual stress versus scanning speed under different directions. (a) Horizontal direction; (b) height direction

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Fig. 6. Residual stress versus powder feeding rate under different directions. (a) Horizontal direction; (b) height direction

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Fig. 7. Laser melting deposited pure Ti sample

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Fig. 8. Schematic of residual stress induced by temperature gradient

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Table 1. Process parameters for laser additive manufacturing
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Table 1. Process parameters for laser additive manufacturing
No. Laser power /W Powder feeding rate /(g·min^-1) Scanning speed /(mm·min^-1) Layer thickness /mm
1 700 4.02 480 1
2 800 4.02 480 1
3 900 4.02 480 1
4 800 4.02 360 1
5 800 4.02 600 0.6
6 800 3.21 480 0.7
7 800 5.11 480 1

Table 2. Measurement results of residual stressesMPa

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Table 2. Measurement results of residual stressesMPa

No.	Bottom		Center		Top
No.	σ_y	σ_z	σ_y	σ_z	σ_y	σ_z
1	-191.35	-250.652	64.096	103.962	39.421	207.532
2	-47.293	-112.631	65.054	80.604	51.354	26.394
3	-110.652	-142.419	93.223	70.073	46.903	56.008
4	-83.108	-145.685	89.443	39.708	77.366	12.106
5	-146.770	-157.298	137.281	101.327	44.025	44.755
6	-113.366	-141.782	110.471	107.442	32.163	11.676
7	-51.899	-164.140	99.559	44.963	28.745	22.281

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Hongji Sun, Jing Wei, Zhaohong Zheng, Dechuang Zhang, Jianguo Lin. Effects of Laser Process Parameters on Residual Stress of Pure Titanium Samples Prepared by Laser Melting Deposition[J]. Chinese Journal of Lasers, 2019, 46(3): 0302014

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