Application of Micromagnetic Technique in Surface Grinding for Assessment of Surface Integrity

Induction of tensile residual stress in grinding particularly using conventional wheel is a major problem. Assessment of residual stress on ground samples using X-ray diffraction technique is quite often time consuming. Micromagnetic technique like Barkhausen Noise analysis has been reported to be used in assessing surface integrity in different metallurgical and manufacturing process. The aim of this article is to establish a correlation between micromagnetic parameters and surface integrity of AISI 1060 steel ground using conventional alumina wheels. Results indicate significant effect of downfeed, work speed, and marginal effect of abrasive grit size on surface integrity parameters like residual stress, grain refinement, grain elongation, and microhardness. Residual stress varied in the present work over a domain of -8MPa to 500MPa. Despite simultaneous variation in microhardness, grain refinement, grain elongation, and residual stress during grinding, a linear correlation could be established between Barkhausen Noise parameters and residual stress (BN=233.4+0.065 ) with a correlation coefficient of around 0.92 for BN (rms).