Friction Freeform Fabrication of Superalloy Inconel 718: Prospects and Problems

被引：14

作者：

Dilip, J. J. S. ^{[1
]}

Ram, G. D. Janaki ^{[1
]}

机构：

[1] Indian Inst Technol, Dept Met & Mat Engn, Mat Joining Lab, Madras 600036, Tamil Nadu, India

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE | 2014年 / 45卷 / 01期

关键词：

METAL-DEPOSITION; MICROSTRUCTURES; RECRYSTALLIZATION; PHASE;

D O I：

10.1007/s11663-013-0003-x

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Friction Freeform Fabrication is a new solid-state additive manufacturing process. The present investigation reports a detailed study on the prospects of this process for additive part fabrication in superalloy Inconel 718. Using a rotary friction welding machine and employing alloy 718 consumable rods in solution treated condition, cylindrical-shaped multi-layer friction deposits (10 mm diameter) were successfully produced. In the as-deposited condition, the deposits showed very fine grain size with no grain boundary delta phase. The deposits responded well to direct aging and showed satisfactory room-temperature tensile properties. However, their stress rupture performance was unsatisfactory because of their layered microstructure with very fine grain size and no grain boundary delta phase. The problem was overcome by heat treating the deposits first at 1353 K (1080 A degrees C) (for increasing the grain size) and then at 1223 K (950 A degrees C) (for precipitating the delta phase). Overall, the current study shows that Friction Freeform Fabrication is a very useful process for additive part fabrication in alloy 718.

引用

页码：182 / 192

页数：11

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