Mathematical Modeling of Transport Phenomena in Multi-track and Multi-layer Laser Powder Deposition of Single-Crystal Superalloy

Liu, Zhaoyang1,2; Jiang, Liang3; Wang, Zi3; Song, Lijun4

2018-12

10.1007/s11661-018-4914-7

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   影响因子和分区

1073-5623

1543-1940

The transport phenomena in the multi-track and multi-layer laser powder deposition process of single-crystal superalloy were studied through an improved three-dimensional transient mathematical model. The effect of overlapping ratio on the transport phenomena such as temperature field, molten pool morphology, and thermal gradient distribution was discussed. Laser powder deposition experiments with single-crystal superalloy were conducted to verify the computational results. Results showed that temperature field and molten pool morphology are symmetric in the first track of the first layer, and then become asymmetric in the following tracks and layers due to the overlapping between tracks. The peak temperature in a layer increases quickly in the first three tracks and then gradually tends to steady state. For the same track number, the peak temperature in the second layer is higher than that in the first layer. The overlapping ratio has a predominant influence on the molten pool morphology and the distribution of normal thermal gradient at the solidification interface. With the increase of overlapping ratio, the melting depth of molten pool decreases, while the height of molten pool increases. Good agreement was obtained between the predicted and experimentally results. Under the given processing parameters, continuous epitaxial columnar dendrites were achieved in multi-track and multi-layer laser deposited SX superalloy with the optimized overlapping ratio = 34pct.

SCI ; EI

英语

第一 ; 通讯

Shenzhen Key Laboratory for Additive Manufacturing of High-Performance Material[ZDSYS201703031748354]

Materials Science ; Metallurgy & Metallurgical Engineering

Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000450297300058

SPRINGER

20183905858098

Deposition ; Morphology ; Superalloys ; Thermal gradients ; Transport properties

Metallurgy and Metallography:531 ; Thermodynamics:641.1 ; Chemical Operations:802.3 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Crystalline Solids:933.1

MATERIALS SCIENCE

Web of Science

1.Southern Univ Sci & Technol, Coll Innovat & Entrepreneurship, Shenzhen 518055, Peoples R China
2.Southern Univ Sci & Technol, Shenzhen Key Lab Addit Mfg High Performance Mat, Shenzhen 518055, Peoples R China
3.Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China
4.Hunan Univ, Hunan Prov Key Lab Intelligent Laser Mfg, Changsha 410082, Hunan, Peoples R China

Liu, Zhaoyang,Jiang, Liang,Wang, Zi,et al. Mathematical Modeling of Transport Phenomena in Multi-track and Multi-layer Laser Powder Deposition of Single-Crystal Superalloy[J]. METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,2018,49A(12):6533-6543.

Liu, Zhaoyang,Jiang, Liang,Wang, Zi,&Song, Lijun.(2018).Mathematical Modeling of Transport Phenomena in Multi-track and Multi-layer Laser Powder Deposition of Single-Crystal Superalloy.METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,49A(12),6533-6543.

Liu, Zhaoyang,et al."Mathematical Modeling of Transport Phenomena in Multi-track and Multi-layer Laser Powder Deposition of Single-Crystal Superalloy".METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 49A.12(2018):6533-6543.