Effect Of Element Re And W On Microstructure And Properties Of Selective Laser Melting GH4169Nickel-based Alloy Powder

GH4169Nickel-based alloy is widely applied in engine important high temperature parts,such as turbine aircraft engineit.it is required to work under high temperature and highcorrosion environment, but the high temperature GH4169Nickel-based alloy was investigatedstrengthening phase γ"unstable at high temperature, it easily turns into the delta facies δ phase,the comprehensive performance of the alloy decreased. based on this,This article mainresearch Effect of element Re and W on microstructure,high temperature creep resistance andhigh temperature corrosion resistance of Selective Laser Melting GH4169after heat treatment.the controversial delta δ are studied by optical microscope, SEM, XRD, etc on.First, the experiment obtain a set of optimal process parameters through a large number ofSingle-layer single-channel scanning, single-layer multi-channel scanning and multi-levelmulti-channel scanning. the best technological parameters is: the laser electric current is130A,the lasers canning speed is130mm/min, the lasers canning spacing of0.35mm, pulse width5.5ms,laser frequency12Hz, powder thickness0.15mm;Second,the GH4169was respectivelyadded in different content of Re elements and W elements, mixed evenly, useing the optimalprocessing parameters.a sample of20mm×15mm×3mm is obtained,and then the sample aftercarrying out solid solution treatment and aging treatment,is carried out for high temperaturecreep test and high temperature hot corrosion experiment. analysising the effect of element Reand W on the creep performance and high temperature hot corrosion performance of thesample. The experimental results show that:1)the elements Re and W can enhance microhardnessof the alloy GH4169, and the microhardness of the sample increases with the content increaseof element Re and W;2)4169alloy containing Re elements,4169alloy containing Welements and not add any elements of the alloy GH4169after solid solution treatment andaging treatment, the alloy containing Re elements of microhardness value is higher than theGH4169alloy microhardness, the microhardness value of GH4169is higher than that ofmicrohardness value of the alloy containing W elements;4169alloy containing Re elementsafter heat treatment contains fewer δ phase, both4169alloy containing element W and notadding any elements of GH4169alloy after heat treatment are all in the δ phase and therectangular shape carbide precipitation3) the creep life of the alloy containing Re elements ishigher than the alloy containing W elements at950℃high temperature4) coated75%Na2S04+25%NaCl under the same conditions of mixed salt,4169alloy containing elementRe thermal corrosion resistance is much better than that of the containing element W, GH4169nickel-based alloy that did not add any elements is investigated thermal corrosive slightlybetter than4169alloy containing element W.the hot corrosion process mechanism of4169alloy containing element W,4169alloy containing Re element and did not add any elementsof the4169alloy hot corrosion process are sulfide-oxidation mechanism, by improving theuniformity of the microstructure and adding Re elements are beneficial to improve the thermalcorrosion resistance of alloy.