The Microstructure Degradation of the IN 713C Nickel-Based Superalloy After the Stress Rupture Tests

Abstract

The aim of the work was to examine the degradation phenomena taking place in the microstructure of the as-cast IN 713C superalloy after stress rupture tests, performed at T = 980°C under a tensile stress of 150 MPa. A directional growth of c¢ phase (rafting) and decomposition of the NbC primary carbides accompanied by the precipitation of M 23 C 6 secondary carbides rich in chromium and of c¢ phase were observed. It was also indicated that the decomposition of the NbC primary carbides may be accompanied by the precipitation of M 3 B 2 borides rich in Mo.

Surface preparation effect on oxidation kinetics of Ni-base superalloy

“…The Nb-carbides formation is also one of the strengthening mechanisms [13]. A similar microstructure of IN 713C has been observed by Binczyk and Śleziona [14] or Matysiak et al [15]. Moreover the surface topography captured using SEM/BSE 3D mode revealed that the surface of the sample prepared with 1 μm polishing differs substantially from the sample with ground surface.…”

The effects of microstructure and microtexture generated during solidification on deformation micromechanism in IN713C nickel-based superalloy

“…LCF and HCF failures 11 The microstructure of cast IN713C generally consists of dendritic structure with MC type carbides that are rich in Nb, Mo, Ti trapped within interdendritic channels [1,30]. For turbocharger wheel blades produced via investment casting, the irregular geometry give rise to different cooling rates and thermal gradients, that leads to further microstructure disparity in different locations within the wheel blades.…”

“…IN713C is a γʹ precipitation hardened cast nickel-based superalloy that was developed by the International Nickel Company in the 1950s [1]. This alloy is still used in large quantities nowadays, because of its good castability, suitable mechanical properties and microstructural stability at elevated temperatures.…”

Evaluation of Carbides in Turbine Blade Made of IN713C Superalloy After Hot Isostatic Pressing

“…IN713C alloys is strengthened by γ' precipitates and carbides. Thanks to its low price, inherent castability, microstructural stability and high strength with ductility at high temperatures, IN-713C is still used to production of blades for low pressure turbine [1]. Turbine blades operate at difficult conditions in aircraft engines.…”

“…Because of the fact that IN713C alloy was produced in the process of investment casting, it is difficult to avoid the porosity during solidification. These defects lead to reduction of mechanical properties of the superalloy, especially creep resistance and fatigue strengths at high temperatures [1].…”