||Effect of Uphill Quenching on the Microstructure and Properties of FC300
||Department of Mechanical Engineering
Gray Cast Iron
Precision machine tool industry has been toward the high precision and high stability, so the request of cast iron was more strict and hard to achieve. If the precision machine tool was made of unstable gray cast iron, the error of accuracy would be accumulated by using time increased. In this study, gray cast iron(FC300) by used material in precision machine tool was studied. Using uphill quenching to compare with the influence produced by natural aging is a method to research stability of gray cast iron. In this experiment, feasibility of uphill quenching prompt gray cast iron stable and the evolution of microstructure with different times of cycle were discussed. Finally, the benefit it produced would be evaluated via hardness test.
The experimental results showed that the phenomenon of graphitization on the part of pearlite matrix would be observed slightly. Part of pearlite matrix dissolved by several times of plastic strain to ferrite and graphite. For the graphite morphology, dimension of graphite increased with cycles and the duration of uphill quenching. Result of hardness did not change significantly, because the phenomenon of graphitization only discover in part of matrix. Moreover, the sample was treated with uphill quenching, and the distortion was observed via residual stress released. Finally, uphill quenching might have some benefits for stabilization of gray cast iron.
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