Correlation between platinum-aluminide coating features and tensile behavior of nickel-based superalloy Rene■80  

作　　者：Mohammad Mehdi Barjesteh Seyed Mehdi Abbasi Karim Zangeneh Madar Kourosh Shirvani 

机构地区：[1]Metallic Materials Research Center,Malek Ashtar University of Technology(MUT),Tehran 158751774,Iran [2]Department of Advanced Materials and New Energies,Iranian Research Organization for Science and Technology(IROST),Tehran3313193685,Iran

出　　处：《Rare Metals》2024年第10期5391-5402,共12页稀有金属（英文版）

摘　　要：The effect of platinum(a rare metal)-aluminide coating parameters on the tensile properties of nickel-based superalloy Rene■80 was evaluated at 871℃.For this purpose,initial layers of platinum with different thicknesses(2,4,6 and 8μm)were coated on tensile samples Then,low-temperature high-activity(LTHA)and hightemperature low-activity(HTLA)processes were used for aluminizing.Results of microstructural evaluations using scanning electron microscope(SEM)and phase analysis by X-ray diffraction(XRD)showed a three-layer structure coating for different platinum layer thicknesses and both aluminizing processes.Increasing the thickness of the platinum layer from 2 to 8μm led to the improvement in the final coating thickness from 91.6 to 102.1μm in HTLA.This increase was from 128.1 to 148.6μm in LTHA.The results of hot tensile tests at 871℃ showed a decrease in strength properties of the coated samples compared to the uncoated ones.However,HTLA and high thicknesses of the initial platinum layer showed an intense reduction.The results of fractographic evaluations abou uncoated samples showed a ductile fracture.On the other hand,coated samples showed a simultaneous ductile and brittle fracture failure mechanism.But the main fracture morphology was brittle cleavage fracture which was for the HTLA.

关 键 词：Rene■80 Platinum-aluminide ALUMINIZING Tensile properties FRACTOGRAPHY 

分 类 号：TG174.4[金属学及工艺—金属表面处理]