Okaya, Japan
Okaya, Japan

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Hosoda Y.,Dijet Industrial Co. | Sakagami K.,Dijet Industrial Co. | Nakata T.,Dijet Industrial Co. | Yamamoto T.,Dijet Industrial Co.
Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy | Year: 2012

WC-βt-Ti(C,N)-Co alloys have different microstructures near surface due to sintering atmosphere. In order to evaluate the characteristics of these alloys with sintered surface, the effects of Ar and N2 sintering atmosphere on the hardness near surface and turning performance of these alloys were investigated. The obtained results were as follows; (1) The thickness of extreme surface layer without βt was slightly larger in Arthan N 2 sintering atmosphere. It was mostly consistent with the area proportion of WC phase. Moreover, the microstructure change of the alloy under Ar sintering atmosphere was rather remarkable judging from the result of EDS analysis. (2) The hardness near surface of the alloy was higher in Ar than N2 sintering atmosphere. It was considered to be mainly due to Co content near surface of the alloy. Consequently, (3) the alloy under Ar sintering atmosphere was superior in flank, nose and crater wear resistance as compared with the alloy under N2 sintering atmosphere. (4) The alloy under Ar sintering atmosphere showed better fracture resistance than the alloy under N2 sintering atmosphere.


Hosoda Y.,Dijet Industrial Co. | Sakagami K.,Dijet Industrial Co. | Yamamoto T.,Dijet Industrial Co.
Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy | Year: 2011

In order to evaluate mechanical and thermal properties of WC-βt-Ti(C,N)-Co alloys consisting of four phases, the effects of additional Ti(C,N) content on mechanical and thermal properties of the alloys were mainly investigated. Moreover, cutting performance of the alloys in face milling was investigated comparing with the case of WC-βt-Co alloys with the same level of hardness. The results obtained were as follows; (1) The hardness increased with increasing Ti(CN) content in the alloy. On the other hand, the fracture toughness and elastic modulus and thermal conductivity decreased with increasing Ti(C,N) content in the alloy. In other words, these changes of mechanical and thermal properties were considered to be mainly due to area proportion of WC phase in the microstructure of the alloy. However, the transverse-rupture strength scarcely changed by Ti(C,N) content in the alloy because the size of fracture origin consisting of the aggregated βt was almost same with no relation to Ti(C,N) content. (2) The cutting performance of WC-βt-Ti(C,N)-Co alloys was remarkably superior to that of WC-βt-Co alloys in wear resistance and surface roughness.


Trademark
Dijet Industrial Co. | Date: 2013-04-30

Metal working machines and machine tools; cutting tools, cemented carbide cutting tools, diamond-pointed cutting tools, turning tools, milling cutters, power drill bits and cutting inserts therefor, all for metal working machines; dies for use with metal working machine tools.


Trademark
Dijet Industrial Co. | Date: 2013-08-23

Metal working machines and machine tools; cutting tools, cemented carbide cutting tools, diamond-pointed cutting tools, turning tools, milling cutters, power drill bits and cutting inserts therefor, all for metal working machines; dies for use with metal working machine tools.

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