45鋼卸扣斷裂原因分析

45鋼卸扣斷裂原因分析Analysis on Fracture Reasons of the 45 Steel Shackle

在吊裝43.4 t容器過渡段的過程中，某吊裝工具的卸扣發生了斷裂。通過化學成分分析、斷口形貌分析、金相檢驗、硬度測試等方法，對卸扣斷裂的原因進行了分析。結果表明：卸扣斷裂起源于表面的缺陷處，缺陷的存在及熱處理工藝不當導致的組織分布不均勻、晶粒粗大、鐵素體沿晶界析出是導致卸扣承載時斷裂的主要原因。

In the process of hoisting 43.4 tons transition section of a container, the shackle of a lifting tool fractured. Through the chemical composition analysis, fracture morphology analysis, metallographic examination, hardness testing and so on, the fracture reasons of the shackle were analyzed. The results show that: the fracture of the shackle originated from the defects on the surface; in addition, the improper heat treatment process led to the inhomogeneous structure distribution, coarse grains, and ferrite precipitation along the boundary; these were the main reasons leading to the shackle fracture during the loading.

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