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首页> 外文期刊>Engineering failure analysis >Brittle fracture of a crane hook
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Brittle fracture of a crane hook

机译：起重机吊钩脆性断裂

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摘要

The objective of this work is to identify the causes that led to a failure of the crane hook in service. The study of the accident includes: (1) a summary and analysis of the peculiarities inherent to the standards that determine the manufacture and use of this type of device, (2) metallographic, chemical and fractographic analyses, (3) assessment of the steel mechanical behaviour in terms of Vickers hardness profile, its tensile strength and fracture energy, and (4) simulation of the thermal history of the hook. The visual and microstructural inspections reveal some evidences that a weld bed was deposited on the hook surface. Several cracks grew from that area into the material. Fracture surface shows features typical of brittle failures (transgranular cleavage fracture). The unalloyed, low-carbon steel contains a relatively low aluminium (<0.025 percent) and high non-combined nitrogen (>0.0075 percent) content. All the gathered evidences are in agreement with a strain-aging process triggering the embrittlement of the material, with the fracture starting from a crack generated at the heat affected zone of an uncontrolled welding of the hook.
机译：这项工作的目的是找出导致起重机吊钩在使用中发生故障的原因。事故研究包括：（1）对确定此类设备的制造和使用的标准固有的特性进行总结和分析;（2）金相，化学和分形分析;（3）钢材评估机械性能，包括维氏硬度分布，抗张强度和断裂能，以及（4）钩的热历史模拟。视觉和微观结构检查显示了一些证据，表明焊床沉积在了钩表面上。从该区域到材料都出现了几处裂缝。断裂表面显示出典型的脆性破坏特征（经晶状卵裂）。非合金低碳钢的铝含量相对较低（<0.025％），非结合氮含量较高（> 0.0075％）。所有收集的证据都与触发材料脆化的应变时效过程相吻合，其断裂始于在不受控制的钩焊接的热影响区产生的裂纹。

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