Experimental Investigation by Cryogenic Treatment of Aluminium 6063 and 8011 and NiCoW Coating to Improve Hardness and Wear

The aim of this paper is to focus on the effect of cryogenic treatment on the microstructure, mechanicaland wear properties of Al 6061 and Al 8011. The first objective was to understand the degree to whichhardness of these aluminium grades have been enhanced by giving cryogenic on the specimens. Thesecond objective is to check the wear resistance property of these two aluminium specimens if coatedwith NiCoW and then treating it cryogenically. To conduct hardness tests specimens were fabricatedfrom aluminium plates from both these grades and cryogenically treated. To conduct wear test, boththe grades of aluminium were coated with NiCoW, and experimental investigation were carried outwith cryogenic coolants. The hardness and wear removal rate were studied for both specimens. Thecryogenic coolant enhanced the hardenability of aluminium alloys resulting in increased hardness ofnearly 15%. The cryogenic coolant has increased the wear resistance properties of aluminium coatedwith NiCoW by nearly 25% when compared to wear of the non-treated aluminium with the coatingmaterials. The cryogenic treatment was carried out under three different timings of 8, 24 and 48 hoursfor three different rpm‟s 300, 600, 800 under varying loads. The paper also studies the microstructuralchanges under these varying conditions.

کلیدواژه ها:

CryogenicHardnessWearMicrostructureCoating