Abstract
The aim of this study was to determine the optimum nitrogen and carbon content in P/M high-speed steels by evaluating cutting performance.
P/M high-speed steels SKH 51 (AISI M2) and SKH 10 (AISI T15) with various content of nitrogen and carbon were prepared by Hip'ing gas atomized powders. Nitrogen was added to steels by heat treating the powders in nitrogen gas before Hip'ing.
The results of cutting tests indicated that in cutting SNCM439, tools containing higher nitrogen have significantly good cutting performance, and
1) 0.5% nitrogen and 0.81.0% nitrogen were the optimum content in SKH 51 and SKH 10, respectively.
2) The optimum carbon equivalent of SKH 51 and SKH 10 was 0.9% and 1.5%, respectively.
But in case of work materials which includes abrasive carbides, the steels containing nitrogen were found to have the inferior cutting performance to the nitrogen-free steels.
