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首页> 外文期刊>Journal of Materials Engineering and Performance >Laser Surface Treatment of Hydro and Thermal Power Plant Components and Their Coatings: A Review and Recent Findings
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Laser Surface Treatment of Hydro and Thermal Power Plant Components and Their Coatings: A Review and Recent Findings

机译：水力和火力发电厂组件及其涂层的激光表面处理：综述和最新发现

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High-power diode laser (HPDL) surface modification of hydro and thermal power plant components is of the utmost importance to minimize their damages occurring due to cavitation erosion, water droplet erosion, and particle erosion (CE, WDE, and PE). Special emphasis is given on the HPDL surface treatment of martensitic and precipitate-hardened stainless steels, Ti6Al4V alloy, plasma ion nitro-carburized layers, high pressure high velocity oxy-fuel and twin-wire arc sprayed coatings. WDE test results of all these materials and coatings in 'untreated' and 'HPDL-treated at 1550 degrees C' conditions, up to 8.55 million cycles, are already available. Their WDE testing was further continued up to 10.43 million cycles. The X20Cr13 and X10CrNiMoV1222, the most common martensitic stainless steels used in hydro and thermal power plants, were HPDL surface treated at higher temperature (1650 degrees C) and their WDE test results were also obtained up to 10.43 million cycles. It is observed that the increased HPDL surface temperature from 1550 to 1650 degrees C has resulted in significant improvement in their WDE resistances because of increased martensitic (alpha') phase at higher temperature. After conducting long-range WDE tests, the correlation of CE, WDE, and PE resistances of these materials and protective coatings with their mechanical properties such as fracture toughness and microhardness product, ultimate resilience, modified resilience, and ultimate modified resilience has been reviewed and discussed. One of the edges of a 500 MW low pressure steam turbine moving blade (X10CrNiMoV1222 stainless steel) was HPDL surface treated at 1550 degrees C and its radii of curvatures and deflections were measured. These were compared with the data available earlier from a flat rectangular sample of similar composition and identical HPDL surface temperature.
机译：水电和火力发电厂组件的高功率二极管激光器（HPDL）表面改性对于最大程度地减少由于气蚀，水滴腐蚀和颗粒腐蚀（CE，WDE和PE）而造成的损害至关重要。特别强调了马氏体和沉淀硬化不锈钢，Ti6Al4V合金，等离子离子硝基渗碳层，高压高速氧燃料和双丝电弧喷涂涂层的HPDL表面处理。已经获得了所有这些材料和涂层在1550摄氏度“未处理”和“ HPDL处理”条件下的WDE测试结果，多达855万次循环。他们的WDE测试进一步继续进行，达到了1043万个周期。 X20Cr13和X10CrNiMoV1222是在水力发电厂和热电厂中使用的最常见的马氏体不锈钢，在较高温度（1650摄氏度）下进行了HPDL表面处理，并且它们的WDE测试结果也达到了1,043万次循环。可以观察到，由于高温下马氏体（α'）相的增加，HPDL表面温度从1550摄氏度增加到1650摄氏度，导致其WDE抵抗力显着提高。在进行了长期的WDE测试之后，对这些材料和防护涂层的CE，WDE和PE电阻与它们的机械性能（例如断裂韧性和显微硬度产品，极限弹性，改性弹性和极限改性弹性）的相关性进行了回顾，并讨论过。在1550摄氏度下对500兆瓦低压蒸汽轮机活动叶片（X10CrNiMoV1222不锈钢）的边缘之一进行HPDL表面处理，并测量其曲率半径和挠度。将这些与早期从类似成分和相同HPDL表面温度的矩形样品中获得的数据进行比较。

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