Effect of processing parameters on surface roughness, porosity and cracking of as-built IN738LC parts fabricated by laser powder bed fusion

Guo，Chuan1,2,3; Li，Sheng3; Shi，Shi4; Li，Xinggang2,5; Hu，Xiaogang1,2; Zhu，Qiang1,2; Ward，R. Mark3

2020-11-01

10.1016/j.jmatprotec.2020.116788

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY   影响因子和分区

0924-0136

1873-4774

An investigation was conducted to understand how different parameters, namely laser power, scan speed and hatch spacing, influence the printing qualities, i.e. surface roughness, porosity and crack density of the nickel-based superalloy Inconel 738LC during laser powder bed fusion. Insufficient overlap, Plateau–Rayleigh instability and Marangoni convection were identified and characterized as the factors that could deteriorate the surface quality of as-built IN738LC parts. Two leading causes of pore were determined by metallographic analysis and computed tomography as lack of fusion and keyhole, which were attributed to different energy input densities. Crack density was measured by metallographic observation. Residual stress and the time for solidification of melt were identified as the key factors that affected the crack density. Finally, the relationships between the printing qualities and volume energy density were established by regression analysis, and the VED of ∼ 48 J/mm was optimal for fabricating IN738LC in the LPBF process

Crack density Laser powder bed fusion Nickel-Based superalloy Porosity Processing parameters Surface roughness

SCI ; EI

英语

第一 ; 通讯

National Natural Science Foundation of China[91860131] ; Shenzhen Science and Technology Innovation Commission[JCYJ20170817111811303] ; National Key Research and Development Program of China[2017YFB0702901] ; SUSTech[FEFE/GAS1792] ; UoB[FEFE/GAS1792]

Engineering ; Materials Science

Engineering, Industrial ; Engineering, Manufacturing ; Materials Science, Multidisciplinary

WOS:000546627400006

ELSEVIER SCIENCE SA

20202308792749

Nickel ; Regression analysis ; Superalloys ; Surface roughness ; Computerized tomography ; Nickel alloys ; Quality control ; Fabrication

Metallurgy and Metallography:531 ; Nickel:548.1 ; Nickel Alloys:548.2 ; Computer Applications:723.5 ; Quality Assurance and Control:913.3 ; Mathematical Statistics:922.2 ; Physical Properties of Gases, Liquids and Solids:931.2

MATERIALS SCIENCE

2-s2.0-85085842376

Scopus

1.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Shenzhen Key Laboratory for Additive Manufacturing of High-performance materials,Shenzhen,518055,China
3.School of Metallurgy and Materials,University of Birmingham,Edgbaston,Birmingham,B15 2TT,United Kingdom
4.Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering,Shenzhen Durability Center for Civil Engineering,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen,518060,China
5.Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology,Shenzhen,518055,China

Guo，Chuan,Li，Sheng,Shi，Shi,et al. Effect of processing parameters on surface roughness, porosity and cracking of as-built IN738LC parts fabricated by laser powder bed fusion[J]. JOURNAL OF MATERIALS PROCESSING TECHNOLOGY,2020,285.

Guo，Chuan.,Li，Sheng.,Shi，Shi.,Li，Xinggang.,Hu，Xiaogang.,...&Ward，R. Mark.(2020).Effect of processing parameters on surface roughness, porosity and cracking of as-built IN738LC parts fabricated by laser powder bed fusion.JOURNAL OF MATERIALS PROCESSING TECHNOLOGY,285.

Guo，Chuan,et al."Effect of processing parameters on surface roughness, porosity and cracking of as-built IN738LC parts fabricated by laser powder bed fusion".JOURNAL OF MATERIALS PROCESSING TECHNOLOGY 285(2020).