Effect of Heating Temperature During Quenching on the Phase Composition and Abrasive Wear Resistance of Engineering Steels
摘要
A comparative study of the effect of quenching temperature from the austenitic and intercritical temperature ranges on the microstructure, hardness, phase composition and abrasive wear resistance of medium-carbon engineering steels 45, 34KhN1M (34CrNi1Mo), and 38KhN3MFA(38CrNi3MoW) is carried out. It is shown that after the quenching with heating above Ac3 , alloyed steels 34KhN1M and 38KhN3MFA are inferior to steel 45 with respect to the abrasive wear resistance. However, after the quenching from the intercritical temperature range, the abrasive wear resistance of these steels exceeds that of steel 45 by 10% due to the presence of a heterophase structure represented by high-carbon martensite, metastable austenite, which transforms on the working surface into friction-induced martensite during wear, and ferrite, capable for friction twinning.