(1 北京科技大學(xué)材料科學(xué)與工程系， 北京 100083;
2 西安交通大學(xué)材料科學(xué)與工程學(xué)院，西安 710049)
摘 要: 對國內(nèi)生產(chǎn)的低磷Inconel 718(P含量＜0.001% )及常規(guī)Inconel 718(P含量為0.008%～0.013%)形變合金鍛件的力學(xué)性能進(jìn)行了對比研究。 結(jié)果表明， 室溫拉伸強(qiáng)度和高溫拉伸強(qiáng)度的差異不大， 然而低磷Inconel 718合金的高溫塑性和650 ℃， 686 MPa的持久塑性明顯降低； 更為值得注意的是，低磷合金在疲勞、蠕變和疲勞/蠕變交互作用下的抗裂紋擴(kuò)展能力都低于常規(guī)合金； 而且低磷合金的595 ℃，895MPa缺口周期持久壽命有降低趨勢。
關(guān)鍵字: 關(guān)鍵詞: 高溫合金 Inconel 718 磷 力學(xué)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
