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Analysis of the cracking causes in an aluminium alloy bike frame

机译：铝合金自行车车架开裂的原因分析

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摘要

Two cracks were detected in the bike frame of an amateur cyclist, before the final failure of the component and after using it for around 35,000 km. The cracks were located in the joint between the bottom bracket, the chain stays, the seat tube and the down tube. This paper analyses the causes of the cracking process and comprises, basically, chemical analysis for material identification, visual inspection of the frame, microstructural analysis, microhardness measurements, mechanical characterisation through Small Punch tests and SEM (plus EDX) analysis of the fracture surface. The analysis concludes that both cracks were caused by corrosion and Stress Corrosion Cracking (SCC) processes that are justified by the differences in the solution potentials between the base material and equilibrium precipitates produced by an overageing treatment. The latter are more anodic and hence easily dissolved in a humid saline environment.
机译：在该零件最终失效之前和使用了约35,000公里之后，在一名业余自行车手的自行车车架中检测到两个裂缝。裂纹位于底部支架，链条撑杆，座管和下管之间的连接处。本文分析了开裂过程的原因，主要包括用于材料识别的化学分析，框架的目视检查，显微组织分析，显微硬度测量，通过小冲孔试验的机械表征以及断裂表面的SEM（加上EDX）分析。分析得出的结论是，这两个裂纹都是由腐蚀和应力腐蚀裂纹（SCC）过程引起的，这可以通过基材和通过过度时效处理产生的平衡沉淀之间的溶液电势差异来证明。后者更具阳极性，因此很容易溶解在潮湿的盐水环境中。

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