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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2007

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Nickel super alloy INCONEL 713LC - structural characteristics after heat treatment

Jonšta P., Jonšta Z., Sojka J., Čižek L., Hernas A.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 22, nr 2

7-14

Purpose: Nickel super alloy's products are mainly using for construction parts of jet engines, gas turbines and turbo-blowers. Design/methodology/approach: Super alloy was commercially produced and was investigated by using the light microscopy (OLYMPUS IX 71) and local chemical microanalysis and by the scanning electron microscopy (JEOL JSM 50A). Findings: we found a mode of optimum heat treatment. On the basis of obtained results it is possible to recommend a following regime of heat treatment: heating and dwell at the temperature exceeding 1240 degrees centigrade (min. 1260 degrees centigrade), so that precipitates at the grain boundaries dissolve completely, with subsequent slow cooling down to the temperature of approx. 940-950 degrees centigrade, so that there occurs intensive intra-granular precipitation of intermetallic phase gamma'. Research limitations/implications: The experiment was limited by occurrence a void in cast alloys. Practical implications: Nickel super alloy's products are mainly using for construction parts of jet engines, gas turbines and turbo-blowers. Originality/value: Mode of optimum heat treatment was proposed. 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 konw-how in this field.