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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2007

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Structural characteristics of nickel super alloy INCONEL 713LC after heat treatment

100%

Jonsta P. , Jonsta Z. , Sojka J. , Cizek L. , Hernas A.

tom Vol. 21, nr 2

29-32

Purpose: Aircraft industry often uses nickel super-alloys for blades of jet engine turbines. This paper summarises analysis of infuence of heat treatment on structural characteristics of nickel super-alloy INCONEL 713C. Design/methodology/approach: Experimental investigation castings made of commercially produced nickel super-alloy INCONEL 713LC. Material was after heat treatment subjected to detailed structural analysis with use of methods of light microscopy (LM), or scanning electron microscopy (SEM) on microscopes OLYMPUS IX71 and JEOLJSM 50A. Findings: Mode of optimum heat treatment was proposed. On this basis of obtained results it is possible to recommend a heat treatment, which would consist of heating and dwell at the temperature exceeding 1240 degrees centigrade (min. 1260 degrees centigrade), so that precipitates at the grain boundaries dissolve completly, with subsequent slow cooling down to the temperature of approx. 940-950 degrees centigrade, so that there occurs intesive intra-granular precipitation of inter-metallic phase gamma'. Research limitations/implications: The experiment was limited by occurence a void in cast alloys. Practical implications: Aircraft industry often uses nickel super-alloys for blades of jet engine turbines. Originality/value: On the basis of obtained results it is possible to recommend the most suitable heat treatment, which produce intensive intra-granular precipitation of intermetallic phase gamma'. It was received a new know-how in this field.