(1 北京科技大学材料科学与工程系， 北京 100083;
2 西安交通大学材料科学与工程学院，西安 710049)
摘 要: 对国内生产的低磷Inconel 718(P含量＜0.001% )及常规Inconel 718(P含量为0.008%～0.013%)形变合金锻件的力学性能进行了对比研究。 结果表明， 室温拉伸强度和高温拉伸强度的差异不大， 然而低磷Inconel 718合金的高温塑性和650 ℃， 686 MPa的持久塑性明显降低； 更为值得注意的是，低磷合金在疲劳、蠕变和疲劳/蠕变交互作用下的抗裂纹扩展能力都低于常规合金； 而且低磷合金的595 ℃，895MPa缺口周期持久寿命有降低趋势。
关键字: 关键词: 高温合金 Inconel 718 磷 力学性能
（1 Department of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China
2 School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, P. R. China）
Abstract:The mechanical properties of low phosphorous Inconel 718 (P<0.001%) and conventional Inconel 718 (P 0.00 8%~0.013%) deformation alloys were investigated. The results show that there is no obvious difference in room temperature and elevated temperature tensile strength between the low P content and conventional Inconel 718 alloys. However, the ductilities of the low P content alloy obviously decrease at 650 ℃, 686 MPa. The more important fact is that the crack propagation rates of the low P content alloy at 650 ℃ creep, futigue and creep/fatigue interaction conditions are higher than that of the conventional alloy, and it seems to have a tendency that the cycle notch stress rupture life of the low P alloy decreases at 595 ℃, 895 MPa.
Key words: superalloy Inconel 718 phosphorous mechanical property
