The engine is the "heart" of the car, and the crankshaft is the key part of the engine, which is the most expensive part in the engine. The crankshaft bears the maximum load and all the power in the engine. During the working process, the journal surface is easy to wear, and the transition fillet between the journal and the crank arm is the weakest. The working conditions (temperature, environmental medium, load characteristics) of crankshaft are all important factors affecting the service of crankshaft. Therefore, proper material selection and heat treatment process are needed to ensure that all required performance indexes can be achieved.<br>
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