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IN718 has been developed in China for applications as aero-engine disks, seals and rings during the last twenty years. Although wrought products of IN718 could meet the requirements of aeroengine components, they exhibited chemical segregation and large grain structure and were difficult-to-process. To overcome the problems encountered with the wrought alloy, a research program aims to develop a unique spray forming process to make sound ring performs and ring rolled parts. Trials were conducted to optimize the process parameters for producing high quality rings. This paper summarizes the results of metallurgical and mechanical evaluation for IN718 in the forms of as-sprayed, spray formed plus ring rolled preforms. Compared to the ingot metallurgy process for wrought products, the unique spray forming process utilized in the program was capable of producing ring preforms with remarkably reduced segregation, finer and more homogeneous microstructure, significantly improved hot workability, and comparable and improved mechanical properties. It was indicated from the evaluation that spray forming could also be utilized to process more highly alloyed and more difficult-to-process than the conventional wrought IN718, and even previously non-forgeable alloys.

Metallurgical Evaluation of Spray Deposited and Ring Rolled IN718