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Effects of Electromagnetic Fields on the Microstructure of Laser Cladding
Yongjun Shi1, Xiaoyu Zhou1, Xiaogang Wang1
1College of Electromechanical Engineering, China University of Petroleum (East China), Qingdao 266580, China.
Materials (Basel, Switzerland)
|June 24, 2022
Summary
Introducing an electromagnetic field during laser cladding refines grain structure and improves element distribution. This technique enhances cladding layer uniformity, reduces dilution, and increases hardness for better material properties.
Area of Science:
- Materials Science
- Metallurgy
- Surface Engineering
Background:
- Laser cladding creates internal stresses and structural defects due to rapid heating and cooling.
- Molten pool condensation leads to uneven element distribution and coarse grains in cladding layers.
Purpose of the Study:
- To investigate the effects of an external electromagnetic field on laser cladding quality.
- To analyze the impact of electromagnetic fields on molten pool fluid dynamics and microstructure.
Main Methods:
- Integration of an electromagnetic field into the laser cladding process.
- Analysis of molten pool flow states under electromagnetic influence.
- Microstructural examination of Ni-based laser cladding on AISI 1045 steel.
Main Results:
- Electromagnetic assistance accelerated molten pool flow, refined grains, and improved uniformity.
- Reduced dendritic crystals, increased isometric and cellular-like dendrites.
- Enhanced element distribution, decreased dilution rate, and improved cladding layer hardness.
Conclusions:
- Electromagnetic field application is an effective method to mitigate defects in laser cladding.
- This technique significantly improves the microstructure and mechanical properties of the cladding layer.
