Fig. 13

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The nature of wear of the preliminary broach teeth during the operational tests after the 4500 mm broaching length: (a) a tool without surface treatment; (b) a tool with (Nb–Ti–Al–V) N coating; (c) a tool after nitriding at 60% N2 + 40% Ar, 480 °C, 60 min with (Nb–Ti–Al–V) N coating; (d) a tool after nitriding at 20% N2 + 80% Ar, 480 °C, 60 min with (Nb–Ti–Al–V) N coating; (e) a tool after nitriding at 40% N2 + 60% Ar, 480 °C, 60 min with (Nb–Ti–Al–V) N coating.

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