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试验用409L不锈钢（/%：0.01 C,0.82～0.86Si,0.26Mn,0.002～0.006S,0.034～0.041P,11.44～1 1.51Cr,0.24～0.27Ti,0～0.09Ce）由10 kg真空感应炉熔炼,锻成30 mm×30 mm方坯,冷轧成2 mm钢板,1100℃5 min退火。研究了Ce对409L钢900℃30 min退火组织的影响和900℃-室温热疲劳性能的影响。结果表明,当钢中含0.03%Ce时409L钢退火晶粒细化,热疲劳性能最佳,当进一步增加Ce含量,退火