Because of the lower yield point of rotor material, the local plastic deformations are found during operation at rate speed.
由于转子材料屈服点较低，在额定转速时，局部会出现塑性形变。
These cracks occur when the combination of mechanical and thermal stresses within these local areas pass over the yield strength of the barrel material and are exaggerated during subsequent cooling.
这种失效的原因在这些局部可能是由于机械和热应力的双重作用超过了辊子自身的材质的抗屈服强度所导致的，并且在进一步冷却中还会进一步扩展。
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