TLP diffusion welding of MGH956 alloy laminate cooling structure in aeroengine
The TLP diffusion welding study of MGH956 aeroengine laminate cooling structure was carried out,the results could provide the technical support for high reliable manufacturing of high temperature components in aeroengine.The self-developed KNiCr-3 amorphous interlayer was used to TLP diffusion weld MGH956 laminated cooling structure at the temperature of 1 240 ℃ holding 8 hours.The welding quality and joint mechanical properties of the laminated welded structure were tested.The tension tests at room temperature and high temperature revealed that all fractures existed in the turbulence column of the laminates cooling structures,not at the welded seams.And the tensile strength of laminates welded structures at room/high temperature reached 90％of those of MGH956 superalloy.The results of ultrasonic testing showed that all the welded seams between the turbulence column and the impingement plate was high quality,no flaw was found.The uniform solid solution microstructure formed in welded seam.The microstructure observation and compositional analysis showed that most elements distributed uniformly around the welded seam,no abrupt change in composition and microstructure.The good welding quality of the laminates cooling structures ensured the thermal and mechanical properties of welded seam could reach those of MGH956 base metal.
MGH956 superalloyporous laminated structure for coolingTLP diffusion weldingwelding qualityroom temperature,high temperature mechanical properties
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维普
