Abstract
Long turning tests on nitrogenized and non-nitrogenized 1214 and plunge forming tests on a range of AISI 12L14 steels with varying nitrogen contents have been carried out. Both tests have revealed an adverse effect of nitrogen on high-speed steel tool life in machining, and this is attributed to static strain aging of the cold-drawn feed stock prior to testing. No compensating beneficial effect of nitrogen on surface roughness was observed in the plunge forming tests, so it is concluded that, overall, nitrogen has a detrimental effect on machinability.
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