Elasto-Viscoplastic Behavior of the Ferritic Stainless Steel AISI 441-EN 1.4509 from Room Temperature to 850°C

摘要: In order to predict the thermomechanical fatigue (TMF) damage of stainless steel parts submitted thermal loading, elasto-viscoplastic behavior has be described accurately in a wide range temperature, strain, and strain rate levels. The study is done on stabilized ferritic grade equivalent AISI 441 or EN 1.4509 standard which used more high temperature application up 950°C, for example, exhaust manifolds, heat exchanger, burners, water-boiler device. model proposed by Chaboche chosen identified basis isothermal cyclic tests including relaxation graduated performed under air at 300, 650 850°C. validation procedure was afterward comparison with nonisothermal conditions, especially in-phase, out-of-phase, diamond TMF cycles. Results simulation show very good fitting experimental curves would lead accurate life prediction.