Influence of Microstructural Factors and Composition on the Bending Fatigue Strength of Ductile Cast Iron for Crankshafts |
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| Authors: | H F López E Fras M M G Cisneros H M Mancha |
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| Affiliation: | 1. Materials Department, College of Engineering and Applied Science, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53201, USA.;2. Academy of Mining and Metallurgy, Reymonte 23, Cracow, Poland.;3. Centro de Graduados e Investigación, Instituto Tecnológico de Saltillo AP 84-C, Saltillo Coah, México.;4. Centro de Graduados e Investigación, Instituto Technológico de Saltillo AP 84-C Saltillo Coah, México. |
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| Abstract: | AbstractIn this work, two crankshaft lots were sectioned and their respective cheeks subjected to bending fatigue testing. The experimental results indicated that lot 1 exhibited good bending fatigue resistance. In this lot, cycles in excess of 106 were always needed to initiate a crack at the fillet. Lot 2 always failed before reaching 106 for all the applied bending loads. This behaviour was observed even for crankshaft sections of similar Brinell hardnesses but different lots. Quantitative metallography of the matrix constituents indicated that lot 1 had inferior nodularity, and nodule count, and contained a relatively larger number of non-metallic inclusions. Nevertheless, it also had a comparatively larger fraction of pearlite which, coupled with significant pearlite refinement, gives rise to improved bending fatigue. Thus, the observed bending fatigue resistance can be related to differences in matrix hardness. |
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