Table of Contents
Journal of Metallurgy
Volume 2014, Article ID 972917, 7 pages
Research Article

Closed Die Hammer Forging of Inconel 718

1Materials and Mechanical Entity, Vikram Sarabhai Space Centre, Trivandrum 695 022, India
2Human Spaceflight Project, Vikram Sarabhai Space Centre, Trivandrum 695 022, India

Received 26 July 2014; Revised 6 November 2014; Accepted 10 November 2014; Published 1 December 2014

Academic Editor: Elena V. Pereloma

Copyright © 2014 S. Chenna Krishna et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A method for the production of Inconel 718 (IN-718) hemispherical domes by closed die hammer forging is proposed. Different combination of operations employed for production are as follows: (i) preforging + final forging + air cooling, (ii) preforging + final forging + controlled cooling, (iii) direct forging + controlled cooling, and (iv) direct forging + air cooling. Last three combinations yielded a crack free hemispherical dome. The forged hemispherical domes were solution annealed at 980°C for 1 h and air cooled. The grain size of the domes at all locations was finer than ASTM No 4. Mechanical properties of the forged dome in solution treated and aged condition (STA) were better than feedstock used.