A comparing study of defect generation in IN738LC superalloy fabricated by laser powder bed fusion: Continuous-wave mode versus pulsed-wave mode

Chuan Guo; Yang Zhou; Xinggang Li; Xiaogang Hu; Zhen Xu; Enjie Dong; Qiang Zhu; R. Mark Ward

doi:10.1016/j.jmst.2021.03.006

A comparing study of defect generation in IN738LC superalloy fabricated by laser powder bed fusion: Continuous-wave mode versus pulsed-wave mode

Chuan Guo, Yang Zhou, Xinggang Li, Xiaogang Hu, Zhen Xu, Enjie Dong, Qiang Zhu^*, R. Mark Ward

^*Corresponding author for this work

Metallurgy and Materials

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

Inconel 738 LC samples were fabricated using laser powder bed fusion under continuous-wave and pulsed-wave modes. Microstructure, surface quality and mechanical properties were compared to evaluate the printing quality between these 2 laser beam modes. The results show that the application of pulsed wave could effectively eliminate cracking in the as-fabricated sample, despite 0.046% porosity generated. Further microstructure analysis revealed that the refinement of grains by the pulsed-wave laser beam was the main contributor in eliminating the cracks. And this refinement was ascribed to the higher cooling rate under the discontinuous radiation of laser beam proofed by the numerical simulation. And the pore formation was related to Rayleigh instability and residual bubbles in the sample under the pulsed-wave mode, while pores were less detrimental to the mechanical properties than cracks. Therefore, the part under the pulsed-wave mode exhibited superior mechanical performance compared to that under the continuous-wave mode.

Original language	English
Pages (from-to)	45-57
Number of pages	13
Journal	Journal of Materials Science and Technology
Volume	90
Early online date	24 Apr 2021
DOIs	https://doi.org/10.1016/j.jmst.2021.03.006
Publication status	Published - 10 Nov 2021

Bibliographical note

Funding Information:
This work is financially supported by National Natural Science Foundation of China (No. 91860131 and No. 52074157 ), National Key Research and Development Program of China (No. 2017YFB0702901), Shenzhen Science and Technology Innovation Commission under the Projects (No. JCYJ20170817111811303, No. KQTD20170328154443162 and ZDSYS201703031748354) and joint Ph.D. program between SUSTech and UoB (No. FEFE/GAS1792).

Publisher Copyright:
© 2021

Keywords

Continuous-wave mode
Defect generation
Laser powder bed fusion
Nickel-based superalloy
Pulsed-wave mode

ASJC Scopus subject areas

Ceramics and Composites
Mechanics of Materials
Mechanical Engineering
Polymers and Plastics
Metals and Alloys
Materials Chemistry

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10.1016/j.jmst.2021.03.006

Cite this

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title = "A comparing study of defect generation in IN738LC superalloy fabricated by laser powder bed fusion: Continuous-wave mode versus pulsed-wave mode",

abstract = "Inconel 738 LC samples were fabricated using laser powder bed fusion under continuous-wave and pulsed-wave modes. Microstructure, surface quality and mechanical properties were compared to evaluate the printing quality between these 2 laser beam modes. The results show that the application of pulsed wave could effectively eliminate cracking in the as-fabricated sample, despite 0.046% porosity generated. Further microstructure analysis revealed that the refinement of grains by the pulsed-wave laser beam was the main contributor in eliminating the cracks. And this refinement was ascribed to the higher cooling rate under the discontinuous radiation of laser beam proofed by the numerical simulation. And the pore formation was related to Rayleigh instability and residual bubbles in the sample under the pulsed-wave mode, while pores were less detrimental to the mechanical properties than cracks. Therefore, the part under the pulsed-wave mode exhibited superior mechanical performance compared to that under the continuous-wave mode.",

keywords = "Continuous-wave mode, Defect generation, Laser powder bed fusion, Nickel-based superalloy, Pulsed-wave mode",

author = "Chuan Guo and Yang Zhou and Xinggang Li and Xiaogang Hu and Zhen Xu and Enjie Dong and Qiang Zhu and {Mark Ward}, R.",

note = "Funding Information: This work is financially supported by National Natural Science Foundation of China (No. 91860131 and No. 52074157 ), National Key Research and Development Program of China (No. 2017YFB0702901), Shenzhen Science and Technology Innovation Commission under the Projects (No. JCYJ20170817111811303, No. KQTD20170328154443162 and ZDSYS201703031748354) and joint Ph.D. program between SUSTech and UoB (No. FEFE/GAS1792). Publisher Copyright: {\textcopyright} 2021",

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T2 - Continuous-wave mode versus pulsed-wave mode

AU - Guo, Chuan

AU - Zhou, Yang

AU - Li, Xinggang

AU - Hu, Xiaogang

AU - Xu, Zhen

AU - Dong, Enjie

AU - Zhu, Qiang

AU - Mark Ward, R.

N1 - Funding Information: This work is financially supported by National Natural Science Foundation of China (No. 91860131 and No. 52074157 ), National Key Research and Development Program of China (No. 2017YFB0702901), Shenzhen Science and Technology Innovation Commission under the Projects (No. JCYJ20170817111811303, No. KQTD20170328154443162 and ZDSYS201703031748354) and joint Ph.D. program between SUSTech and UoB (No. FEFE/GAS1792). Publisher Copyright: © 2021

PY - 2021/11/10

Y1 - 2021/11/10

N2 - Inconel 738 LC samples were fabricated using laser powder bed fusion under continuous-wave and pulsed-wave modes. Microstructure, surface quality and mechanical properties were compared to evaluate the printing quality between these 2 laser beam modes. The results show that the application of pulsed wave could effectively eliminate cracking in the as-fabricated sample, despite 0.046% porosity generated. Further microstructure analysis revealed that the refinement of grains by the pulsed-wave laser beam was the main contributor in eliminating the cracks. And this refinement was ascribed to the higher cooling rate under the discontinuous radiation of laser beam proofed by the numerical simulation. And the pore formation was related to Rayleigh instability and residual bubbles in the sample under the pulsed-wave mode, while pores were less detrimental to the mechanical properties than cracks. Therefore, the part under the pulsed-wave mode exhibited superior mechanical performance compared to that under the continuous-wave mode.

AB - Inconel 738 LC samples were fabricated using laser powder bed fusion under continuous-wave and pulsed-wave modes. Microstructure, surface quality and mechanical properties were compared to evaluate the printing quality between these 2 laser beam modes. The results show that the application of pulsed wave could effectively eliminate cracking in the as-fabricated sample, despite 0.046% porosity generated. Further microstructure analysis revealed that the refinement of grains by the pulsed-wave laser beam was the main contributor in eliminating the cracks. And this refinement was ascribed to the higher cooling rate under the discontinuous radiation of laser beam proofed by the numerical simulation. And the pore formation was related to Rayleigh instability and residual bubbles in the sample under the pulsed-wave mode, while pores were less detrimental to the mechanical properties than cracks. Therefore, the part under the pulsed-wave mode exhibited superior mechanical performance compared to that under the continuous-wave mode.

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A comparing study of defect generation in IN738LC superalloy fabricated by laser powder bed fusion: Continuous-wave mode versus pulsed-wave mode

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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