Research Of ADI And Its Wear-resistant With Low-alloy

It is a brand-new attempt that ADI with low-alloy is used the material of loading vehicle gears. The loading vehicle gears require excellent mechanical properties. So far it has been a few articles about these application. The craft of ADI is studied and selected through a great deal of experiments in this paper.First, the second compound-gestation craft and its influence on spheroid graphite, microstructure and mechanical properties are studied. The content of costly metal (Mo.Ni) can be decreased and the limit about raw material can be fallen if the valid craft is adopted.Second, the heat-treatment craft and its influence on microstructure and mechanical properties are studied. The integrated mechanical properties can be improved if anneal craft is adopted. The stability of retained-austenite is affected by austenize temperature and time. The content of retained-austenite and the extent of bainite change are affected by austempered temperature and time. The craft of austenize and austempered is the most important factor. It can acquire ADI material with better integrated mechanical properties when the crafts of heat-treatment is anneal(stove cooling to 6005L and natural air cooling after 900℃~910℃×3h), austenize (900℃ × 120min) and austempered (370℃x90min)n.Third, the wear-resistant of ADI in different austempered temperature is compared with 20CrMnTi steel through the three-system and the pin-on-disc type abrasion experiment in this paper. The results show that the wear-resistant of ADI (austempered in 280ftL) is good at low load and the wear-resistant of ADI (austempered in 370tT) is better than 20CrMnTi steel after certain time abrasion in high load.Finally, the gears of ADI are analyzed after they have been run for one year in load vehicle. The result shows that ADI gears can replace the 20CrMnTi steel's gears.