Abstract
The objective of this study is to examine the mechanical strength of ARE-deposited Ti (C, N) film by using acoustic emission (AE) source characterization under tensile and compressive loading. Threshold stress in the substrate steel causes Mode-I fractures in the film as determined by quantitative source inversion of AE signals emitted from the limited Ti (C, N) area with a uniform stress distribution. Film fractures were invariably associated with the emergence of slip steps in the substrate steel. The threshold stress for film fractures under tensile loading was almost 9times greater than the stress under compressive loading.A simple method for estimating internal stresses in film from threshold stresses under different loading was also proposed. The internal stress in the film, estimated from the maximum strain criterion, was -3.8GPa which coincided with the reported internal stress measured using X rays.
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