对含不同质量分数(0, 0.6%, 3%)铜的高铬铁素体钢在650 ℃和140 MPa条件下蠕变前后的组织和蠕变性能进行了研究。结果表明: 随着铜含量从0提高3%, 钢的蠕变断裂时间从1 172 h提高到1 620 h, 蠕变速率从2.2×10-9s-1降低到1.2×10-9s-1; 铜的添加有效抑制了对蠕变性能不利的高温δ铁素体相的形成; 添加3%铜的试验钢基体内弥散析出了大量尺寸为50~100 nm的富铜相, 有效抑制了位错的运动, 从而提高了该钢的蠕变抗力。

The microstructure and creep property before and after creep of three high chromium ferric steels with 0wt%Cu, 0.6wt%Cu and 3wt%Cu were studied under the conditions of 650 ℃ and 140 MPa. The results show that the creep fracture time increasing from 1 172 h to 1 620 h and the creep rate decreased from 2.2×10-9 s-1 to 1.2×10-9 s-1 with the Cu content increasing from 0wt% to 3wt%. The addition of Cu effectively suppressed forming high temperature δ-ferrite phase adverse to the creep property.Numerous Cu-rich phases with the size of 50-100 nm dispersedly precipitated in the matrix of the tested steel with 3wt%Cu, which could effectively restrain the motion of dislocation and thus increase the creep resistance of the steel.