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Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Fatigue Limit of High V–Cr–Ni Spheroidal Carbides Cast Iron under Rotating Bending Fatigue Test
Masahito TanakaKazumichi ShimizuDaijiro ItoHideto Matsumoto
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2012 Volume 53 Issue 2 Pages 350-353

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Abstract

This study is to find vanadium carbide (VC) effects on fatigue limit of spheroidal vanadium carbide cast iron (SCI-VCrNi) with addition chromium (Cr) and nickel (Ni). The VC is very hard, about 2300 HV in the Vickers hardness and excellent abrasion resistance is possessed. But the shape control of VC is extremely difficult. Then, fatigue limit of SCI-VCrNi was evaluated by rotating bending fatigue test in this study. And, the fatigue tests of FCD500 and FCD700 also were carried out and it was compared with the SCI-VCrNi.
As a result of rotating bending fatigue testing, the fatigue limit (σw) of SCI-VCrNi has 350 MPa. The fatigue limits of FCD500 and FCD700 have 290 and 300 MPa respectively. A fatigue limit of SCI-VCrNi was higher than all spheroidal graphites cast irons. Then, fracture surface was observed by using the SEM to observe the fatigue mechanism more in detail. As for SCI-VCrNi, a lot of fracture cross sections of VC were observed, it can be guessed that the uniting power of VC and the matrix is strong and the crack progress is delayed by breaking VC.

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© 2012 Japan Foundry Engineering Society
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