TITLE:
Thermomechanical Testing of GGG 40 Spheroidal Graphite Cast Iron Alloy
AUTHORS:
Marwan Faisal, Eman El-Shenawy, Mohamed A. Taha
KEYWORDS:
Thermo-Mechanical Behavior, Spheroidal Graphite Cast Iron, Gleeble-3500
JOURNAL NAME:
Materials Sciences and Applications,
Vol.8 No.3,
March
31,
2017
ABSTRACT: Spheroidal graphite cast iron GGG 40 was thermo-mechanically tested using thermo-mechanical simulator Gleeble-3500. Three deformation steps were successively applied on test-specimen at temperatures namely; 900°C, 850°C and 750°C within the austenitic zone, at the same strain rate of 0.1 s-1. No cracks were observed, up to 50% deformation, after successive deformation steps. Stress-strain relationship obtained is correlated with previous work on SGCI with a different carbon equivalent. It was found that by decreasing the deformation temperature; for the same CE, young’s modulus, yield strength and strain hardening exponent increase. Microstructure of the deformed zone, for a specimen quenched after the final deformation step, reveals fine elongated ferrite and pearlite, as well as elongated graphite. While microstructure of the non-deformed zone subjected to the same treatment, includes coarser ferrite and pearlite with graphite spheres embedded in the matrix.