3.5% NaCl溶液中Inconel 690合金微动腐蚀与磨损的交互作用特性

使用PLINT微动腐蚀试验机,位移幅值(D)为100~250μm,法向载荷(Fn)为20~80N,频率(f)为2 Hz,循环次数(N)为10 000次,在3.5%的NaCl溶液中进行了Inconel 690合金微动腐蚀试验。结果表明:微动腐蚀与磨损成正交互作用,腐蚀对磨损的促进量是交互作用量增加的主要部分;微动引起腐蚀电位负移,载荷和位移幅值增加均引起腐蚀电流及腐蚀速率增加;磨痕表面可观察到磨损与腐蚀共同作用及相互促进的形貌特征。Inconel 690合金在3.5%的NaCl溶液中的微动腐蚀机理主要是磨损腐蚀、剥层和磨粒磨损的递进及协同作用。     

316不锈钢长时总体一次薄膜应力强度许用值预测方法研究

General primary membrane stress (S_mt ) of material is the important parameter used for the mechanical analysis of high temperature reactor design, and the data of Smt at 300000 hours in the ASME code and RCC-MR code cannot meet the needs of long-life nuclear reactor design. Based on the data of allowable stress intensity (S_t), expected minimum stress-to-rupture (S_r ) and stress rupture factors (R ) at 300000 hours in the ASME code, the Smt at 500000 hours of 316 stainless steel base metal and weld required by long-life reactor design are obtained successfully by Larson-Miller extrapolation model.