Structure and Properties of Heat-Resistant Nickel Alloys Castings after Hot Isostatic Pressing

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Abstract: In the process of hot isostatic pressing (HIP) of blades it occurs the “healing” of micropores and friables which are not coming out to the surface of parts. It results in stabilization of the structure and properties of the material. The structural un-homogeneity is typical for the material of blades and samples after HIP. It appears as the result of formation of the «raft»-structure in the form of zonal parts in the places of “healing” of pores and around of МС-type carbides. The subsequent heat treatment enhances the structural homogeneity of the alloy, stress relaxation and has a positive effect on plasticity of the alloy while maintaining the strength and heat resistance. HIP processing and the subsequent homogenization provide the most favorable combination of strength, plasticity and long-term strength.

Authors: Vladimir Klochihin, Natalia Lysenko, and Valeriy Naumyk

Keywords: Blade, Hot Isostatic Pressing, Micropores, Shrink Friables, “Raft”-Structure, Heat Treatment, Structural Homogeneity, Plasticity, Strength, Heart Resistance

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5 pages

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