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《Journal of Aeronautical Materials》 2005-02
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Cracking Sensitivity on Laser Cladding Inconel 738 on Directionally Solidified Ni-base Superalloy

SUN Hong-qing, ZHONG Min-lin, LIU Wen-jin, HE Jin-jiang, LI Xiao-li, ZHU Xiao-feng(Laser Processing Research Centre, Mechanical Engineering Department,Tsinghua University, Beijing 100084, China)  
The cracking sensitivity of laser cladding Inconel 738 alloys on directionally solidified Ni-base superalloy substrate for the purpose of strengthening and repairing the directionally solidified gas turbine blades was studied. The results indicated that laser cladding of Inconel 738 on directionally solidified Ni-base superalloy substrate was very sensitive to crack. The cracks were mostly the thermal cracks which originated in the grain boundary in the heat affected substrate. The cracks went through the interface between the directionally solidified substrate and the cladding layers, and then developed into multi-deposited cladding layers. Cracks also appeared inside the multi-deposited cladding layers, developing along the grain boundaries directly. The low melting point eutectics between the grain boundaries of directionally solidified Ni-base superalloy substrate were the main sources of the thermal cracks. Strict control of the heat input during laser cladding could dramatically decrease the cracking tendency. Directionally solidified layers were deposited by laser cladding on directionally solidified substrate with good shaping and free of cracks by optimizing the cladding technique and laser parameters.
【CateGory Index】: TG174
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