Fig. 8
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Influence of cutting speed V on the tool life T of coated inserts in turning workpieces of 41CrMo4 − DIN (HB 230) (a) and AISI 321(HB 180) steels (b): 1– TiN; 2–TiZrN; 3–TiFeN-TiN; 4–(Ti-Fe)-TiFeN-TiN; 5–(Ti-Zi-Fe)-TiZrFeN-TiZrN; 6–(Ti-Fe)-TiFeN-TiN + LO, 7–(Ti-Zi-Fe)-TiZrFeN-TiZrN + LO.
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