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Failure analysis of conversion reactor drum by metal dusting

机译:金属粉尘转化炉转鼓故障分析

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The catastrophic failure of a heat resistance steel conversion reactor drum was investigated. Conventional metallography and SEM were used to identify the microstructure of the samples. EDS was used for microchemical analysis. The phases produced in the drum inner surface were identified by X-ray diffraction. Average carbon content was measured using CS-analyzer equipment. Changes in mechanical properties were evaluated by Rockwell B hardness test. A complex pattern of external scaling, internal oxidation and varying extents of surface disintegration and pitting were identified as high-temperature corrosion by metal dusting. The results showed that metal dusting type III, active corrosion, had taken place in reactor. As a consequence of metal dusting, carbides had been solved and pits and holes had been formed in matrix especially along with grain boundaries. Finally, cracks which had been initiated from pits or holes broke reactor.
机译:研究了耐热钢转化炉鼓的灾难性故障。使用常规金相和SEM鉴定样品的微观结构。 EDS用于微化学分析。鼓内表面产生的相通过X射线衍射鉴定。平均碳含量是使用CS分析仪设备测量的。力学性能的变化通过洛氏B硬度测试进行评估。外部结垢,内部氧化以及表面崩解和点蚀程度不同的复杂模式被认为是金属粉尘引起的高温腐蚀。结果表明,反应堆中发生了III级金属喷粉活性腐蚀。由于金属除尘,碳化物得以解决,并且在基体中特别是与晶界一起形成了坑和孔。最终,由坑或孔引发的裂纹破坏了反应堆。

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