Mrs HONG ZHANG (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)Prof. Junjie WANG (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)
The cryogenic treatment can improve wear resistance and mechanical properties of many metallic materials and the improvement is largely affected by the cryogenic treatment condition. In this work, samples of gray cast iron were treated at various cryogenic treatment temperature and cryogenic holding time. The main objective of this work is to investigate the effect of the cryogenic treatment condition on wear resistance of the gray cast iron. All the cryogenic treatment processes were done in a SLX-80 program-controlled cryogenic container. Wear tests were performed using a MMU-10G friction and wear tester. Surface feature of the treated samples were characterized with scanning electron microscopy (SEM). It was showed that the wear resistance of the cryogenically treated samples was superior to those of non-cryogenically treated ones. The lower temperatures for cryogenic treatment were more effective in improving the wear resistance properties. The improvement in wear resistance by cryogenic treatment was attributed to the decrease of residual stress in gray cast iron.
Mrs HONG ZHANG (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)