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An investigation on the failed blades in a locomotive turbine

机译：机车涡轮叶片故障的研究

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摘要

A failure investigation has been conducted on the turbine blades used in a locomotive turbochanger, which are made from K418 Ni-base superalloy. Fractography investigation on the troubled blade indicates that cracks initiated from the surface of the concave side close to the trailing edge and propagated towards to the leading edge. The multi-origin fatigue fracture is the dominant failure mechanism of the blade. Metallographic morphology typical of over-heat damage features, such as re-dissolution of the eutectic gamma + gamma', melting of the local region of the grain boundary appears in the microstructure of the airfoil part of the failed blades. Appearance of over-heat damage structure in the serviced blades makes the strength of the blade material decrease intensely to initiate fatigue cracks and make one of the blades fracture first. Fragments from the blade fractured first would crash the other blades to make the blades break or bending deformation.
机译：已经对机车涡轮转换器中使用的由K418镍基高温合金制成的涡轮机叶片进行了故障研究。对有故障的刀片进行的断口扫描研究表明，裂纹是从凹面的表面开始接近后缘的，并向前缘扩展。多起源疲劳断裂是叶片的主要失效机理。过热损伤特征的典型金相形态，例如共晶γ+ gamma'的再溶解，晶界局部区域的熔化出现在失效叶片的翼型部分的微观结构中。维修叶片中过热损坏结构的出现使叶片材料的强度急剧下降，从而引发疲劳裂纹，并使其中一个叶片首先断裂。刀片首先断裂的碎片会使其他刀片崩溃，从而使刀片断裂或弯曲变形。

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