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Failure analysis of steam turbine blade roots

机译：汽轮机叶片根部的故障分析

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An analysis of the fracture cause for a steam turbine blade root is conducted in this study. During the maintenance of a steam turbine, nineteen IP-6S (Intermediate Pressure 6th Stage) blades with root cracks were detected. The causes of blade cracking are analyzed through macroscopic inspection, magnetic particle testing, room temperature mechanical property testing, micro-hard-ness testing, chemical analysis, metallographic analysis, scanning electron microscopy and energy spectrum analysis, as the blade static stress is simulated in this paper. The results showed that the chemical composition and mechanical properties of the blade leaves are qualified, and none abnormal corrosive substances are found in the crack initiation part. The numerical simulation result showed that the surface of the first tooth arc is the mostly stressed part of the root, and the stress level can be increased by a loosing installation. The main reason for the root cracking of the blade is that the gap between the blade root and the leaf groove becomes larger, which leads to the changes of the blade root contact mode, then the stress of the first tooth arc was further increased, finally the root and leaf groove wear is aggravated, and fatigue cracking occurs at the stressed first tooth.
机译：该研究进行了对蒸汽轮机叶片根部的断裂原因的分析。在维护蒸汽轮机期间，检测到具有根裂缝的19个IP-6s（中间压力第6阶段）叶片。通过宏观检测，磁粒子检测，室温力学性能检测，微型硬性试验，化学分析，金相分析，扫描电子显微镜和能谱分析，分析了叶片开裂的原因，因为模拟了叶片静压应力这张纸。结果表明，叶片叶片的化学成分和机械性能是合格的，并且在裂纹引发部分中没有发现异常的腐蚀性物质。数值模拟结果表明，第一牙齿弧的表面是根部的主要压力部分，并且通过松动的安装可以增加应力水平。叶片的根裂化的主要原因是叶片根和叶片之间的间隙变大，这导致叶片根系接触模式的变化，然后最终进一步增加了第一齿弧的应力进一步增加根和叶槽磨损加剧，并且在应力的第一齿处发生疲劳裂缝。

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