Aezeden Mohamed and John Pumwa

Mechanical Engineering Department, PNG University of Technology, Lae, MP 411

Papua New Guinea, aezeden.mohamed@pnguot.ac.pg , john.pumwa@pnguot.ac.pg

Abstract

This paper presents an investigation of engineering failure modes for INCONEL601 tested after exposure to annealed heat-treatment (1.5 hour duration) and as received prior to annealing. Microstructural and failure surfaces were tested for chemical composition and examined by metallographic techniques and fatigue fractography. Scanning electron microscopy and enginery dispersive spectroscopy (SEM-EDS) revealed the presence of voids, dimples, and striations associated with fatigue crack propagation. The microstructural characterization of annealed INCONEL601 is notable for triangular voids that congregate along grain boundaries in contrast to the as received INCONEL601. In addition, the tensile and fatigue strengths of as-received samples were greater than annealed heat-treated INCONEL601.

Keywords

INCONEL601, Fatigue fracture, Striation, Tensile fracture