Wear of Coated Tungsten Carbide Tool In Cutting H.S. Steel Ⅷ

In last part we know that the (Al,Cr)N coating is harder than the (Ti,Al)N one and make the coated surface of tungsten carbide tool more resistant to abrasive wear which is the main wear mechanism in our experiments. And this part we will explain the second reason of why the wear progress is slower for (Al,Cr)N coated tungsten carbide tool.

Second, as compared with the oxygen element on the worn surface of the (Ti,Al)N coating film shown in Fig. 3 i(b) and that of the (Al,Cr)N coating film shown in Fig. 3 ii(b), the oxygen element of the (Al,Cr)N coating film, which was turned at long cutting distance, is  less than that of the (Ti,Al)N coating film. Therefore, the cutting temperature of the (Al,Cr)N coating film is considered to be lower than that of the (Ti,Al)N coating film, and the wear progress of the (Al,Cr)N is slower than that of the (Ti,Al)N. One reason for the lower cutting temperature of the (Al,Cr)N coating film is as follows.

That is, the (Al,Cr)N coating film has a lower coefficient of friction as compared with the (Ti,Al)N coating film. Furthermore, the (Al,Cr)N coating film has a higher oxidation temperature as shown in Table III. This is considered to be the reason why there is less tool wear of the (Al,Cr)N coated tungsten carbide tool.

(To be continued. This article is divided into several parts. Here is part 8 For part 7 please refer to http://news.chinatungsten.com/en/tungsten-information/80628-ti-10437; for part 9 please refer to http://news.chinatungsten.com/en/tungsten-information/80632-ti-10439)

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