Bending fatigue characteristics of cemented carbides for cold forging tools

被引：0

作者：

Dijet Industrial Co., Ltd., 2-1-18 Kamihigashi, Hirano-ku, Osaka 547-0002, Japan ^{[1
]}

机构：

[1] Dijet Industrial Co., Ltd., Hirano-ku, Osaka 547-0002

来源：

Funtai Oyobi Fummatsu Yakin | 2007年 / 4卷 / 260-263期

关键词：

Bending fatigue limit; Cemented carbides; Cold forging; Transverse-rupture strength;

D O I：

10.2497/jjspm.54.260

中图分类号：

学科分类号：

摘要：

It is very important to acquire knowledge on bending fatigue characteristics of cemented carbides tools for cold forging, because the tools are generally applied under strong repeated stress at their use. In this study, the effects of grain size of WC and Co content on the bending fatigue characteristics were mainly investigated for fine and coarse-grained WC-0.5 ∼ 1.0mass%Cr3C2-10-22mass%Co alloys and the relation between transverse-rupture strength and fatigue limit was discussed. The results obtained were as follows: (1) The bending fatigue limit of fine-grained WC alloys was higher than that of coarse-grained WC alloys and that of low Co alloys was higher than that of high Co alloys in each WC grain size. This tendency was similar to the case of transverse-rupture strength. (2) The fracture origin observed in low cycle range was mostly aggregated WC, while that in high cycle range above 105 cycles showed tendency to change Co pool or its segregation. (3) There was a very strong correlation between transverse-rupture strength and bending fatigue limit, and 45-55% of the transverse-rupture strength was equivalent to the bending fatigue limit. This relation enables to estimate the fatigue limit of cemented carbides.

引用

页码：260 / 263

页数：3

共 7 条

[1]

Sakagami K., Kouno S., Yamamoto T., Bending Fatigue Characteristics of Micrograin Carbide Alloys, J. Jpn. Soc. Powder Powder Metallurgy, 50, pp. 396-399, (2003)

[2]

Yamamoto T., Kamachi K., The Surface Residual Stress of Cemented Carbides Coated with TiC or TiN by Chemical Vapour Deposition Process and Physical Vapour Deposition Process, Journal of the Japan Institute of Metals, 49, pp. 120-124, (1985)

[3]

Yamamoto T., Kamachi K., An X-ray Study of Residual Stress Generated in Cemented Carbide, Coated with TiN by CVD Process and PVD Process, Journal of the Japan Institute of Metals, 50, pp. 320-327, (1986)

[4]

Sakagami K., Kouno S., Yamamoto T., Effects of HIP-ed and Surface Conditions on Bending Fatigue Characteristics of WC-12mass%Co alloys, J. Jpn. Soc. Powder Powder Metallurgy, 49, pp. 306-311, (2002)

[5]

Fujiwara Y., Ueda H., Masatomi H., Suzuki H., Fatigue of Hot Isostatic Pressed WC-12%Co Alloys, J. Jpn. Soc. Powder Powder Metallurgy, 27, pp. 181-184, (1980)

[6]

Suzuki H., Tanase T., Binder Content on the Transverse-rupture Strength of WC-Co Cemnted Carbides, Journal of the Japan Institute of Metals, 40, pp. 726-732, (1976)

[7]

Suzuki H., Cemented Carbides and Sintered Hard Materials, (1986)

← 1 →