Investigating the Impact of Substrate Preheating on the Thermal Flow and Microstructure of Laser Cladding of Nickel-Based Superalloy

The preheating of the substrate in laser additive superalloys can reduce residual stress and minimize cracking. However, this preheating process can lead to changes in the heat transfer conditions, ultimately affecting the resulting microstructure and mechanical properties. In order to explore the i...

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Bibliographic Details
Published inMaterials Vol. 17; no. 2; p. 399
Main Authors Jin, Zhibo, Kong, Xiangwei, Ma, Liang
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 01.01.2024
MDPI
Subjects
Additive manufacturing
Analysis
Computational fluid dynamics
Cooling rate
Energy
Fluid dynamics
Growth models
Heat resistant alloys
Heating
Investigations
Laser beam cladding
Lasers
Mathematical models
Mechanical properties
Melt pools
Microstructure
Nickel
Nickel alloys
Nickel base alloys
Particle size
Phase transitions
Residual stress
Solidification
Solids
Stress management
Substrates
Superalloys
Temperature distribution
Velocity
substrate preheating
laser cladding
melt pool heat transfer
additive manufacturing simulation
dendrite spacing
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Summary:The preheating of the substrate in laser additive superalloys can reduce residual stress and minimize cracking. However, this preheating process can lead to changes in the heat transfer conditions, ultimately affecting the resulting microstructure and mechanical properties. In order to explore the influence of substrate preheating on the formation of laser cladding, this research focuses on investigating the characteristics of Inconel 718, a nickel-based superalloy, as the subject of study. To simulate the temperature and flow field of laser cladding, a 3D computational fluid dynamics (CFD) model is employed. By varying the initial preheating conditions, an investigation is conducted into the distribution of the temperature field under different parameters. This leads to the acquisition of varying temperature gradients, G, and solidification speeds, R. Subsequently, an analysis is carried out on both the flow field and solidification microstructure in the melt pool. The results demonstrate that the preheating of the substrate results in a slower cooling rate, ultimately leading to the formation of a coarser microstructure.
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ISSN:1996-1944
1996-1944
DOI:10.3390/ma17020399