Studies of fatigue strength of cast-iron crankshafts restored by wide-layer surfacing

Currently, cast iron crankshafts are used in foreign cars, the restoration of which is a difficult task due to the characteristics of high-strength cast iron. The article presented for publication is devoted to topical issues of fatigue strength research of restored cast iron crankshafts. The process of restoring the crankshaft, associated with intensive movement of dislocations or with the closure of worn shaft necks when heated to high temperatures, can cause changes in the microstructure of the material, which, in turn, leads to a decrease in abrasion strength. The results of numerous studies have shown that parts restored using surfacing processes significantly lose fatigue strength, especially under conditions of variable loads. Therefore, for a cast-iron crankshaft operating under heavy loads and restored by surfacing, conducting strength tests is mandatory.