Fatigue of cold-work tool steels: Effect of heat treatment and carbide morphology on fatigue crack formation,life, and fracture surface observations |
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| Authors: | Kenzo Fukaura Yoshihiko Yokoyama Daien Yokoi Nobuhiro Tsujii Kanji Ono |
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| Affiliation: | (1) the Department of Materials Science and Engineering, Hemeji Institute of Technology, 671-22 Himeji, Japan;(2) the Research and Development Center, Sanyo Special Steel Co. Ltd., 672 Himeji, Japan;(3) Present address: High Alloy Steel Group, Technical Administration Department, Sanyo Special Steel Co. Ltd., Japan;(4) the Department of Materials Science and Engineering, University of California, 90095 Los Angeles, CA |
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| Abstract: | The fatigue properties of two types of cold-work tool steels tempered at various temperatures were evaluated. The microstructure
and fracture surface morphology were correlated to the fatigue behavior. Cold-work tool steels using this study were a conventional
tool steel (JIS SKD11; 1.4C-11Cr-0.8Mo-0.2V) and its modified steel (M-SKD11; 0.8C-8Cr-2Mo-0.5V). The fatigue strength of
the M-SKD11 steel increased 20 pct over that of the SKD11 steel for any number of cycles. This is attributed to the refinement
of primary M7C3 carbides. These M7C3 carbides fractured during fatigue and were found at the sites of fatigue crack initiation. Change in crack initiation behavior
was confirmed by acoustic emission testing. The S-N curves of the steels are similar to those of most structural steels. However,
the subsurface fatigue crack initiation was dominant at lower alternating stresses. This study points to a general approach
of carbide refinement that can be used for the enhancement of fatigue properties. |
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