Estimation of crack initiation and growth of hard coating by uniaxial tensile test and rotating cross-cylinders wear

Cold forming has required considerably superior hard coating on a die to manufacture net-shaped products. Especially, under poor lubrication conditions or dry condition, the is indispensable for success of manufacturing. Accordingly, prevent adhesion, reduce friction, and control wear. Recently, it been also necessary improve life product qualities severe tribological conditions. However, comprehension damage such as cracking, flaking, galling insufficient metal forming. This study focuses initiation growth cracking in coating. Assuming subjected tensile stress, nominal frictional shear performances typical four coatings are investigated by two tests. One uniaxial test, another rotating cross-cylinders wear friction test. These tests applied estimate mechanical performance coatings: CrN, TiN, VC, CrAlN. After test analyses with detail observation, CrAlN collectively exhibits highest anti-cracking property tested coatings.