研究了国产碳钢材料在573K、溶解氧浓度5μg/kg至8mg/kg的水介质和573K空气中的疲劳性能.疲劳试验是在应变控制模式下进行,试验条件是三角波形、应变速率1×10-3s1以及总应变0.5%～2.4%.试验后用扫描电镜观察试样断面.试验结果表明,在溶解氧浓度大的情况下,溶解氧浓度对试样的疲劳寿命有明显的影响;溶解氧浓度越大,试样断面上的二次裂纹越多.此外,所有试验数据都分布在ASME设计疲劳曲线之上,高温水介质对碳钢材料的疲劳性能有很大的影响.
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