Role of hydrogen in the efficiency of anodic grinding of WC-Co sintered alloy

The method of inverse torsional pendulum is used to measure the internal friction in specimens of iron of various degrees of purity and steels subjected to grinding, hydrogenation, and coating. In all treated specimens, at temperatures varying within the range 100-400degreesC, we discovered complex spectra of internal friction. The nature of relaxation processes running in the subsurface layers of treated specimens is determined by comparing the parameters of the peaks of internal friction with the literature data for deformed and hydrogenated iron and steel. The interaction of interstitial atoms with mobile dislocations and the motion of steps in screw dislocations are, presumably, the main causes of the formation of peaks of internal friction in specimens covered with lubricating oil.