@article{oai:kanazawa-u.repo.nii.ac.jp:00009808,
 author = {広瀬, 幸雄 and 夫, 明煥 and 松岡, 秀明 and 朴, 栄哲},
 issue = {12},
 journal = {材料=Journal of the Society of Materials Science, Japan},
 month = {Dec},
 note = {In order to study the influence of stress ratio and WC grain size, the characteristics of fatigue crack growth were investigated in WC-22wt.%Co cemented carbides with two different grain sizes of 3 and 6μm. Fatigue crack growth tests were carried out over a wide range of fatigue crack growth rate covering the threshold stress intensity factor range ΔK_<th>. The fatigue tests were conducted at 10Hz and two stress ratios R=0.1 and 0.5 in laboratory air at room temperature using the 3-point bending specimens. It was found that the crack growth rate da/dN against the stress intensity factor range ΔK depended on stress ratio R. The crack growth rate plotted in terms of the effective stress intensity factor range ΔK_<eff> (after allowing for crack closure) still exhibited the effect of microstructure. Fractographic examination revealed brittle fracture at R=0.1 and ductile fracture at R=0.5 in Co binder phase. The amount of Co phase transformation was closely related to the fatigue crack growth characteristics., 金沢大学大学院自然科学研究科},
 pages = {1402--1408},
 title = {WC-Co超硬合金の疲労き裂進展特性に及ぼす応力比およびWC粒径の影響},
 volume = {46},
 year = {1997}
}