Heat treatment method for optimizing mechanical property of additive manufacturing GH3536 nickel-based superalloy

Abstract

The invention provides a heat treatment method for optimizing the mechanical property of an additive manufacturing GH3536 nickel-based superalloy. The heat treatment method comprises the following steps that S1, the GH3536 nickel-based superalloy is prepared by adopting an additive manufacturing technology; S2, the temperature of a muffle furnace is increased to 1020 DEG C-1080 DEG C, and the additive manufacturing GH3536 nickel-based high-temperature alloy obtained in the step S1 is rapidly put into the muffle furnace to be subjected to solid solution heat treatment. and S3, the GH3536 nickel-based superalloy obtained in the step S2 and subjected to solid solution heat treatment is cooled in air. By means of the method, dispersed carbides can be evenly distributed in additive manufacturing GH3536 nickel-based superalloy grains, the number of carbides at the grain boundary is reduced, the strength and plasticity of the additive manufacturing GH3536 nickel-based superalloy are well matched, the comprehensive mechanical property is superior to that of a traditional forge piece, and the application range of the additive manufacturing GH3536 nickel-based superalloy is wider.

Description

technical field [0001] The invention belongs to the technical field of alloy heat treatment, and in particular relates to a heat treatment method for optimizing the mechanical properties of additive manufacturing GH3536 nickel-based superalloy. Background technique [0002] GH3536 is a nickel-based superalloy with high iron content, mainly a solid-solution strengthened alloy of chromium and molybdenum, which is widely used in the manufacture of aero-engine combustion chamber components and other high-temperature components. The current more complex use environment makes the structure of Hastelloy X alloy components more and more complicated, the performance requirements are getting higher and higher, and the challenges faced by the existing manufacturing technology are becoming more and more severe. On the other hand, selective laser melting (SLM) is an additive manufacturing (AM) technique used to create parts with complex geometries. This additive manufacturing method has...

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Problems solved by technology

However, nickel-based superalloys prepared by the SLM process usually have relatively high strength, but low plasticity, which cannot meet the requirements for use. Usually, subsequent heat treatment is required to adjust the matching of strength and plasticity of the molded parts.

[0003] Since the microstructure of the GH3536 alloy obtained by additive manufacturing is very different from that obtained by traditional processing methods such as forging, the heat treatment system of the conventional traditional process for forming GH3536 is used to perform subsequent heat treatment on the SLM formed GH3536. Although the effect of improving plasticity can be achieved, due to the relatively high solid solution temperature, the grains are completely recrystallized, and the number of dislocations is also significantly reduced, which leads to a significant decrease in its strength and cannot meet practical requirements.

In addition, although the density of superalloys prepared by SLM technology can reach more than 99.7%, there are still some microscopic defects such as microcracks and holes. These defects will also significantly reduce the mechanical properties of superalloys, which are difficult to achieve after conventional heat treatment systems. The performance of the traditional forged state or even the cast state cannot fully take advantage of the advanced manufacturing method of additive manufacturing

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