INCONEL® alloy 783
An oxidation-resistant low coefficient of thermal expansion (low CTE) superalloy developed for gas turbine applications. The alloy is strengthened by a precipitation-hardening heat treatment made possible by additions of niobium and aluminum. In addition, the aluminum content provides excellent resistance to oxidation at high temperature. The alloy’s density is 5% less than those of superalloys such as INCONEL alloy 718. The combination of low expansion, high strength and excellent resistance to oxidation makes the alloy especially useful for gas turbine and steam turbine components. The low expansion enables closer control of clearances and tolerances for greater power output and fuel efficiency.
Inconel 783 生产工艺参数参考

工艺流程： VIM + ESR 或者 VIM + VAR +热轧、锻造+ 固溶退火 + 扒皮
固溶出来 温度 1105-1120 ℃ ，空气中冷却
晶粒尺寸 5 或者更细
固溶退火条件下硬度 < 29 HRC

力学性能----热处理条件下
843 ℃  -  2-4小时 -  空气
718℃   -   8小时 - 户内冷却 55℃  -  时长 降至621℃ ---   8小时---空气


力学性能---  室温
0.2%强度验证> 724 N/mm2
抗拉强度> 1103 N/mm2
延伸率(l=4d) > 12%
断面收缩率> 12
硬度：> 27 HRC


650℃下拉伸强度
0.2%强度验证> 621 N/mm2
抗拉强度> 896 N/mm2
延伸率(l=4d) > 15%
断面收缩率> 25

在650摄氏度， 轴向应力586MPa下蠕变断裂。 裂断时长要大于23小时且延伸率> 8%。