A Heat Treatment Method for Laser Selective Melting and Forming Nickel-based Superalloy

Abstract

The invention discloses a heat treatment method for a nickel-based superalloy formed by selective laser melting, which includes: ‑ 3 In a vacuum environment of Pa, raise the temperature from room temperature to 900℃±10℃ and keep it for 0.5h, then raise the temperature to 1050℃~1100℃ and keep it for 1h~4h, then inflate and cool; ‑3 Pa vacuum environment, temperature at 735 ° C ± 15 ° C under the condition of heat preservation for 8h ~ 10h, air cooling. By controlling the grain size of the austenite matrix and the type and quantity of precipitated phases, the low-temperature plasticity and toughness are improved, and the application range of the material is expanded. ‑196℃, Rm not less than 1500N / mm 2 , Rp0.2 not less than 1100N / mm 2 , A not less than 12%, Z not less than 20%, KU2 not less than 60J.

Description

[0001] technology field [0002] The invention relates to the technical field of metal additive manufacturing, in particular to a heat treatment method for laser selective melting and forming of a nickel-based superalloy. Background technique [0003] The nickel-based superalloy involved in the present invention is a Ni-Cr-Fe-based precipitation-hardening superalloy with a long-term service temperature range of -253°C to 650°C, excellent comprehensive mechanical properties, good processing performance and welding performance. Alloys have good mechanical properties and structural stability in low-temperature media (such as liquid oxygen or liquid hydrogen, etc.), and are widely used in liquid oxygen methane engines, liquid hydrogen and liquid oxygen engines and other liquid rocket engines that use cryogenic propellants. Components such as turbo pump housings, centrifugal wheels, etc. [0004] Laser selective melting forming technology has the characteristics of high manufactur...

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Problems solved by technology

[0006] The technical problem solved by the present invention is: aiming at the problem that the mechanical performance index after heat treatment in the prior art does not meet the development requirements, a heat treatment method for forming nickel-based superalloys by laser selective melting is provided. -3 In a vacuum environment of Pa, raise the temperature from room temperature to 900°C±10°C and keep it for 0.5h, then raise the temperature to 1050°C~1100°C and keep it for 1h~4h, then inflate and cool; -3 Pa vacuum environment, temperature at 735 ° C ± 15 ° C under the condition of heat preservation for 8h ~ 10h, inflated to cool

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