SOME FACTORS INFLUENCING ADIABATIC SHEAR BINDING IN IMPACT-WEAR

Adiabatic shear banding (ASB) is an important phenomenon in high energ y impact wear. Some factors influencing ASB, such as number of impacts , nature of the abrasive particles and material microstructure were in vestigated in this paper. It is shown that low alloy steels (40Cr and 40CrNiMo) tempered below 500 degrees C are liable to produce white ASB s whereas specimens with austenitic structure do not readily generate ASBs in impact wear. Internal white ASBs often occur after the formati on of a surface white-etching layer with the increase of impact number . The width and depth of internal white ASBs were found to depend on t he temperature of tempering. The nature of the abrasives also has an e ffect on the pattern of ASBs. In the experiments, a white phase beneat h the impacted surface was also observed. (C) 1998 Elsevier Science S. A.