Effects of process variables on interfacial quality of laser cladding on aeroengine blade material GH4133 |
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| Authors: | Zheng Xiong Guang-xia Chen Xiao-yan Zeng |
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| Affiliation: | 1. School of Optoelectronics Science and Engineering, State Key Laboratory of Laser Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, PR China;2. College of Science, Naval University of Engineering, Wuhan, Hubei 430033, PR China;1. Imam Khomeini International University, Qazvin, Iran;2. Department of Mechanical Engineering, Pardis Branch, Islamic Azad University, Pardis New City, Tehran, Iran;3. Department of Chemical Engineering, Islamic Azad University, Arak Branch, Arak, Iran;4. Department of Energy, Material and Energy Research Center, Karaj, Iran;5. Laboratoire d’Energétique et de Mécanique Théorique et Appliquée, ENSEM, 2, avenue de laForêtde Haye, 60604 54518 Vandoeuvre, France;1. Research Institute of Forests and Rangelands, P.O. Box 13185-116, Tehran, Iran;2. Payamenoor University, Karaj Branch, Karaj, Iran;3. Faculty of Natural Resources, University of Tehran, Karaj, Iran;4. Peak Science and Environment, Station House, Leadmill, Hathersage, Hope Valley S32 IBA, UK;1. School of Materials Science and Engineering, Beihang University, Beijing 100191, China;2. Department of Military Logistics, Military Transportation University, Tianjin 300161, China;1. University of Twente, Laboratory of Mechanical Automation, P.O. Box 217, 7500 AE Enschede, The Netherlands;2. Materials innovation institute (M2i), P.O. Box 5008, 2600 GA Delft, The Netherlands;3. University of Twente, Production Technology, P.O. Box 217, 7500 AE Enschede, The Netherlands;1. School of Mechanical Engineering, Jiangsu University, Zhenjiang, 212013, PR China;2. School of Mechanical Engineering, Southeast University, Nanjing, 211189, PR China |
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| Abstract: | Consecutive layer of a cobalt alloy, stelliteX-40, were deposited onto a GH4133 superalloy plate. The microstructure and mechanical properties of laser cladding were examined. An inappropriate combination of laser power, scanning velocity or pre-placed powder height can result in the formation of incomplete fusion interface between the cladding layer and substrate, or reheat cracking along the coarse grain boundary in the heat-affected zone (HAZ) after ageing treatment. The SEM and energy dispersive spectroscopy (EDS) show the absence of precipitate particles within the reheating crack with similar average compositions for the crack and the substrate. The plastic deformation due to residual thermal stress induced by thermal cycle of laser cladding process is concentrated on the coarse grain boundaries within the HAZ as grains are strengthened by precipitating particles during the aging process. This concentrated plastic deformation is mainly responsible for reheat cracking. The laser cladding layer with integrated melt interface and without reheat cracking can be obtained by optimizing laser power, scanning velocity and powder thickness. The experimental results of microhardness show the homogenous property distribution within the material after the ageing treatment. |
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