稀土Ce对X20Co马氏体耐热钢蠕变性能的影响

向钰琳, 杨仁贤, 蔡欣, 胡小强, 李殿中

Effect of Ce Addition on Creep Properties of X20Co Martensitic Heat-resistant Steel

XIANG Yulin, YANG Renxian, CAI Xin, HU Xiaoqiang, LI Dianzhong

表2 X20Co的蠕变断裂时间、最小蠕变速率和加速蠕变阶段开始时间

Table 2 Rupture time, minimum creep rate, and start time of the creep acceleration phase for three studied X20Co steels crept at a temperature range of 680~720oC and under a stress range of 100~200 MPa

Temperature / oC Stress / MPa Rupture time / h Minimum creep rate / h-1 Start time of the creep acceleration phase / h 0Ce 5Ce 12Ce 0Ce 5Ce 12Ce 0C 5Ce 12Ce 700 100 379 497 578 9.13 × 10-5 1.56 × 10-4 1.03 × 10-4 355 440 519 700 150 58.4 77.6 119 4.63 × 10-3 4.32 × 10-3 6.81 × 10-3 51.4 70 106 700 200 13 17 19 3.58 × 10-3 2.21 × 10-3 2.40 × 10-3 12 15 17 680 200 93 107 111 3.59 × 10-3 2.81 × 10-3 1.18 × 10-3 85 99 104 720 200 3.3 4.8 7.0 1.17 × 10-2 3.55 × 10-3 5.38 × 10-3 2.7 3.6 6.2