Fracture analysis of the fanshaft was made by observing macroscopic and microscopic appearances of the crack, and examining micro hardness and chemical composition of the material.
通过观察断裂风机轴裂纹宏观和微观形貌，检验化学成分、显微硬度等方法对风机轴断裂的原因进行了分析。
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On the way out, these gases drive a turbine which is connected to the fan via a shaft, thus drawing in more air and keeping the process going.