| The anti-high-temperature oxidation performance and grain growth behavior of 409L,410S,430 hot-rolled ferritic stainless steels were studied in this paper. Put the test samples into the box-type furnace at various temperatures, Records the weight increase and grain size grow up in time. Rely on these records and XRD, SEM ,EDS and metallographic analysis , Kinetics and the diffusion mechanism of three kinds ferritic stainless steel anti-high-temperature oxidation performance and grain growth behavior was investigated.The results show that 409L ferritic stainless steels has better anti-high-temperature oxidation performance . This is because the following two reasons . First , Impurity control of 409L stainless steel is very good ,and the stainless steel contain traces of Ti.Second , The microstructure of 409L stainless steel is equiaxial grain . The oxidation reaction activateion energy of 409L,410s,430 hot-rolled ferritic stainless steel is Ea(409L)=245.4 KJ/mol,Ea(410S)=228.1 KJ/mol,Ea(J430)=234.2 KJ/mol , The reaction control factors is the diffusion of metal ions and oxygen in oxide.Metallographic analysis kinetics of grain growth was investigated for the three kinds ferritic stainless steels . Blow 900℃, Because of the big grain size ,the grain boundary migration driving force of 409L stainless steel is bigger than 410S and 430,So the 409L stainless steel grains grow faster. Through calculation, The grain growth activation energy of 409L,410S,430 hot-rolled ferritic stainless steel respectively is 103.8KJ/mol,124.5KJ/mol,128.5KJ/mol. Heat treatment temperature is the most important influence factor of grain growth behavior. By the dynamic equation we can predict the grain size in different temperature of different holding time.The anti-high-temperature oxidation performance and grain growth behavior of 409L,410S,430 hot-rolled ferritic stainless steel can described by Larson-Miller parameters, which agrees with experimental results. |
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