Assessment of Microhardness Profile in Grinding Using Barkhausen Noise Technique at Various Analysis Parameters

Abstract

An experimental investigation was carried out to study the effect of variation in Barkhausen noise (BN) analysis parameters (magnetizing voltage and excitation frequency) for assessment of microhardness profile upon surface grinding. A varying amount of surface damage was induced in the ground samples by changing the downfeed during grinding. It was observed that variation in microhardness inversely affects root mean square (rms) value of BN signal. The observed BN profile indicated no phase transformation or microstructural changes upon grinding. Metallographic study of ground samples has been undertaken to confirm the results obtained by BN analysis. Barkhausen noise parameter (rms value of BN signal), at elevated magnetizing voltage and excitation frequency, increased with reduction in microhardness along the depth indicating the applicability of BN analysis technique in assessing the microhardness profile of ground steel.

Detection methods and bearing failure characteristics analysis related to grinding burns

“…Metallographic examination and microhardness testing are often used as the methods to confirm grinding burn, when the grinding burn detected by other detection methods such as cold acid pickling and Barkhausen noise analysis are uncertain whether it is a grinding burn. Kumar et al [15] found that Barkhausen noise value (root mean square) increases at the elevated magnetization voltage and excitation frequency and is associated with a reduction in micro-hardness along the depth on a ground sample. Sackmann et al [16] investigated the influence of magnetization frequency on the Barkhausen noise signals and found that magnetization frequency has influence on root mean square-value (mp-value) and coercivity, whereas no influence on the peak position.…”