Some Effects of Deoxidation on the Machinability of Quenched and Tempered Steel

摘要

The project examined the machinability of steels in tempered martensite conditions deoxidized with both Ca-Si-Al and Ca-Fe-Si and tempered at various temperatures. The cuttings tests observed the proposed ISO format. The tests were carried out by turning with sintered carbide tools. A simple quick-stop device working on gunpowder was designed for the tests. The cutting tests revealed that the Ca-Si-Al deoxidized steel was better for cutting than the Ca-Fe-Si deoxidized steel in all the tempered martensite structural conditions studied. This better quality only appeared below a certain cutting speed, depending on the tempering temperature. The Ca-Si-Al deoxidized steel showed a distinct wear inhibiting layer formation in the tool. The layer proved to be rich in Al. (Author)