Effect of Annealing Temperature on Wear Resistance and Corrosion Resistance of(AlCoCrFeNi)1-x/(CoCrNi)x Composites
(AlCoCrFeNi)1-x/(CoCrNi)x(x=20％,mass fraction)composites with excellent wear and corrosion resistance were prepared by selective laser melting(SLM).Then the composites were annealed at different temperatures(600,800,1000 ℃).The effects of annealing temperature on the microstructure,hardness,wear resistance and corrosion resistance of the composites were studied by XRD,SEM,EDS,EBSD,hardness tester,friction and wear tester,electrochemical workstation and X-ray photoelectron spectroscopy.After annealing at 600 ℃,the phase composition of the composites does not change,which is composed of bcc phase and B2 phase,and the grains are more uniform and finer than those before annealing.After annealing at 800 and 1000 ℃,the fcc phase appears and the grains are coarser.The higher the annealing temperature,the heavier the fcc and the larger the grain size.With the increase in annealing temperature,the hardness and wear resistance of the composites increase first and then decrease.Due to the fine grain strengthening effect,the hardness and wear resistance of the sample annealed at 600 ℃ are the highest.Compared with the sample before annealing,the hardness of the annealed sample is increased by 26.9％and the wear mass loss is decreased by 32％.Annealing treatment promotes the enrichment of Cr2O3 in the passive film and improves the corrosion resistance of the composites.The sample at 1000 ℃ shows the best corrosion resistance.
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