【摘要】 在直接时效IN718(简称DA718)合金中单独添加磷至0.022％(质量分数,下同)及添加磷至0.022％和硼至0.011％,合金的持久性能都得到了大幅度的提高.其中在650℃/700MPa,两种成分合金的持久寿命分别提高至200％和280％,但后者的塑性有所下降.磷、硼对蠕变实验中的应力指数影响不大,但显著提高表观蠕变激活能.对磷、硼在DA718合金中的作用进行了讨论.更多还原

【Abstract】 Adding 0.022% phosphorus separately and adding both 0.022% phosphorus and 0.011% boron to direct aging IN718 (DA718) alloy can greatly improve its stress rupture properties, at 650 ℃ under 700 MPa, the stress rupture lives reach up to over 200% and 280% respectively, while the ductility of the later alloy decreased slightly. Phosphorus and boron do not obviously modify the stress exponent but increase the apparent activation energy for creep markedly. The roles of phosphorus and boron played in the DA718 alloy were discussed.更多还原