Fatigue and corrosion-fatigue behavior of 13Cr-4Ni steels and additively manufactured alloys, for application to large size components such as hydraulic turbines and machineries

根据魁北克水电的一项研究：“魁北克的装机容量中有35125兆瓦（35829兆瓦）是水力发电。quacimbec境内有25个大型水库，可以多年储存水，并帮助管理向国内和出口市场的电力供应。由于廉价电力的可用性和电力推广活动，魁北克76%的家庭使用电供暖系统。魁北克有一个广泛的高压输电系统，将电力从大部分北部的水电站长距离输送到南部的需求中心”。**** hydro - qu忧郁的生产船队，包括350多台水力涡轮机。考虑到其几何结构的复杂性，这些流道是通过焊接组装而成的，导致了异质和复杂的微观结构。在使用中，水轮机受到循环载荷、空化和腐蚀的影响。由于机械疲劳和腐蚀的共同作用，水蚀性会增加损伤并降低使用寿命。****在这个多学科项目中，我们建议评估疲劳和腐蚀的协同效应，以进一步了解我们两个合作伙伴使用的合金的降解机制。这将有助于合作伙伴确定其总拥有成本，并制定缓解腐蚀的策略，以确保其基础设施的长期可持续性。具体来说，我们将i)研究两种类型的铁基合金（不锈钢和铸铁），ii)量化它们的腐蚀性能，iii)研究它们的疲劳性能，iv)开发预测疲劳腐蚀模型，这将有助于我们的合作伙伴进行技术开发。**********************

According to a study on hydroelectricity in Quebec: "35,125 MW (out of 35,829 MW) of Quebec's installed capacity is hydroelectric. There are 25 large hydro reservoirs within Québec, which can store water on a multi-annual basis and help manage electricity deliveries to internal and export markets. Due to the availability of inexpensive electricity and electric promotion activities, 76% of households in Quebec use an electric heating system. Quebec has an extensive high-voltage transmission system, transporting electricity over long distances from mostly northern hydro dams towards southern demand centers".****Hydro-Québec's production fleet, comprises more than 350 hydraulic turbines. Viewing the complexity of their geometry, these runners are assembled by welding resulting in heterogeneous and complex microstructures. In service, hydraulic turbines are subjected to cyclic loads, cavitation and corrosion. Water corrosiveness can increase damages and reduce operating life as a result of the combined effects of mechanical fatigue and corrosion.****In this multidisciplinary project we propose to evaluate the synergistic effects of fatigue and corrosion to further understand the degradation mechanism of the alloys used by our two partners. This will help the partners defining their total cost of ownership & develop mitigating corrosion strategies to ensure long term sustainability of their infrastructure. Specifically, we will i) study two types of iron based alloys (stainless steel and cast iron), ii) quantify their corrosion properties, iii) study their fatigue properties and iv) develop predictive fatigue-corrosion models that will aid our partners in their technology development.**********************