Double-fined Treatment on Cold-Punching Dies Made of GCr15 Steel
Influences of conventional heat treatment and double-fined treatment on structure and properties of cold-punching die made of GCr15 steel were compared. The results show that its crystal and carbonization are fined and dislocated martensite become more after double-fined treatment; at the same time, there are more sheet-retained austernite in lathy martensite and around sheet martensite; broken-orifice changes from definitely cleavage brittleness fracture to definitely cleavage tenacity fracture. Double-fined treatment can effectively improve strength and toughness of GCr15 steel,accordingly increase service life of cold-punching die made of the steel.
Abstract In the application of some polymers as track detectors, the attention should be paid to the fact that the track recording properties of these polymers are changed under the influence of certain parameters, such as the electromagnetic radiations and environmental conditions. In this work the etching effects of 60Co gamma irradiated CR-39 polycarbonate have been studied. For deeper study of the structural changes in CR-39, the FTIR and UV–visible spectra have been analyzed. The FTIR spectra shows considerable changes due to the gamma exposure. The contribution of degradation mechanism is discussed.