![]() ![]() ![]() ![]() However, it was observed that, additions of 0.01% of mischmetal are less effective as inclusion modifier when sulphur content is higher than of 0.05%, but it is still good enough to obtain a better fatigue behavior compared with the untreated steel containing 0.023% sulphur. These results were discussed and correlated to the small size and globular shape of the MnS inclusions. The higher fatigue limit was obtained for the mischmetal-treated steel with 0.05%S. Moore - rotating beam fatigue testing machine. The fatigue behavior was tested under the E466 standard, by using nine samples per composition in a R.R. The mischmetal treated steels developed a globular, small (~2µm) and well distributed MnS inclusions, producing an improvement in tensile strength (840 MPa and 19% elongation) and fatigue behavior (375 MPa), which was not evident on the untreated steels (741 MPa tensile strength and 300 MPa fatigue limit). A detailed study of the type, size, shape and distribution of the sulphide inclusions was carried out by optical and SEM microscopy in the as-cast and hot rolled conditions and correlated with their mechanical properties. Two steels were alloyed with mischmetal ( 0.01%) as inclusions modifier to evaluate its effect on fatigue and tensile properties. For this work, hot-rolled plates of medium carbon steel ( 0.5%C) were prepared with different sulphur contents ( 0.023% to 0.065%). ![]()
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