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

Chuan Guo ¹Yang Zhou ²Xinggang Li ³Xiaogang Hu ²Zhen Xu ²Enjie Dong ²Qiang Zhu ²R.Mark Ward⁴

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作者信息

1. Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen 518055,China;Shenzhen Key Laboratory for Additive Manufacturing of High-performance materials,Shenzhen 518055,China;School of Metallurgy and Materials,University of Birmingham,Edgbaston,Birmingham B152TT,United Kingdom
2. Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen 518055,China;Shenzhen Key Laboratory for Additive Manufacturing of High-performance materials,Shenzhen 518055,China
3. Shenzhen Key Laboratory for Additive Manufacturing of High-performance materials,Shenzhen 518055,China;Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology,Shenzhen 518055,China
4. School of Metallurgy and Materials,University of Birmingham,Edgbaston,Birmingham B152TT,United Kingdom
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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 eval-uate 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.There-fore,the part under the pulsed-wave mode exhibited superior mechanical performance compared to that under the continuous-wave mode.

Key words

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

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基金项目

National Natural Science Foundation of China(91860131)

National Natural Science Foundation of China(52074157)

National Key Research and Development Program of China(2017YFB0702901)

Shenzhen Science and Technology Innovation Commission under the Projects(JCYJ20170817111811303)

Shenzhen Science and Technology Innovation Commission under the Projects(KQTD20170328154443162)

Shenzhen Science and Technology Innovation Commission under the Projects(ZDSYS201703031748354)

joint Ph.D.program between SUSTech and UoB(FEFE/GAS1792)

出版年

2021

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

参考文献量44

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