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首页> 外文期刊>Engineering failure analysis >Failure analysis on circulating water pump of duplex stainless steel in 1000 MW ultra-supercritical thermal power unit
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Failure analysis on circulating water pump of duplex stainless steel in 1000 MW ultra-supercritical thermal power unit

机译：1000 MW超超临界火电机组双相不锈钢循环水泵故障分析

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With a large number of properties such as good mechanical properties and excellent corrosion resistance, 2205 duplex stainless steel (DSS) has been extensively used in many industries for the last decades. However, improper welding procedures will induce embrittlement of the weld joint, seriously decreasing the safety reliability of the weld joint. In this study, lots of unexpected fractures occurred on 2205 DSS which was used as the material for making circulating water pump (CWP) in an ultra-supercritical thermal power plant of China for the first time. By means of diverse characterization methods, comprehensive investigation was carried out on the failed CWP. Analysis results reveal that many lack of penetrations (LOPs) in the weld joint and unbalance ferrite/austenite ratio induced by improper welding procedures should be responsible for the fracture of the CWP. And effective countermeasures and suggestions were also proposed. So the analysis results have instructive significance for the fracture prevention of the CWP, even for ensuring safety operation of other equipment under similar seawater environment. (C) 2014 Elsevier Ltd. All rights reserved.
机译：2205双相不锈钢（DSS）具有许多特性，例如良好的机械性能和出色的耐腐蚀性，在过去几十年中已广泛用于许多行业。但是，不正确的焊接程序会导致焊缝变脆，严重降低焊缝的安全可靠性。在这项研究中，首次在中国的超超临界热电厂中，将2205 DSS用作制造循环水泵（CWP）的材料时发生了许多意外断裂。通过多种表征方法，对失败的CWP进行了全面调查。分析结果表明，由于焊接工艺不当而导致的焊缝中许多熔深（LOP）不足和铁素体/奥氏体比例失衡是造成CWP断裂的原因。并提出了有效的对策和建议。因此，分析结果对于防止CWP断裂，甚至对于确保类似海水环境下其他设备的安全运行也具有指导意义。 （C）2014 Elsevier Ltd.保留所有权利。

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