Preparation method of high-strength and high-plasticity Inconel718 alloy based on SLM

Abstract

A preparation method of a high-strength and high-plasticity Inconel 718 alloy based on SLM comprises the following steps: S1, selective laser melting forming is conducted, specifically, an Inconel 718 alloy blank is printed through a selective laser melting method; and the Inconel 718 alloy blank is sequentially subjected to step S2: isostatic pressing heat treatment, step S3: stress relief annealing treatment, step S4: solution treatment and step S5: two-stage aging treatment, specifically, the temperature of isostatic pressing heat treatment is 1165-1170 DEG C, the pressure intensity is 125-135 Mpa, and the time is 210-270 min; the temperature of stress relief annealing is 790-810 DEG C, and the time of stress relief annealing is 20-40 min; the temperature of solution treatment is 940-960 DEG C, and the time of solution treatment is 20-40 min; and in two-stage aging treatment, the temperature of first-stage aging treatment is 750-770 DEG C, the time of first-stage aging treatment is 470-490 min, the temperature of second-stage aging treatment is 640-660 DEG C, and the time of second-stage aging treatment is 470-490 min. The Inconel 718 alloy prepared by the method has strength, plasticity and hardness and has excellent comprehensive mechanical properties, and the application of the Inconel 718 alloy can be expanded to the field of more precise and complex structures.

Description

technical field [0001] The invention relates to a method for preparing a high-strength and high-plasticity Inconel718 alloy based on SLM, and belongs to the technical field of alloy additive manufacturing. Background technique [0002] Superalloys are high-performance materials that can work for a long time at temperatures above 600°C and under certain stress conditions. Inconel718 alloy is a precipitation-strengthened nickel-based superalloy, which is widely used in aerospace due to its high strength at 650 °C, excellent fatigue and creep resistance, and good oxidation and corrosion resistance. , nuclear power and energy fields. [0003] The mechanical properties of Inconel718 alloy mainly depend on its precipitated phase, including: γ"(Ni 3 Nb) phase, γ'(Ni 3 (Al,Ti,Nb)), δ(Ni 3 Nb), Laves are equal. γ"(Ni 3 Nb) phase is the main strengthening phase, γ'(Ni 3 (Al, Ti, Nb)) phase is an auxiliary strengthening phase. Appropriate amount of δ(Ni 3 The Nb) phase has the...

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Problems solved by technology

However, metal SLM forming has the characteristics of rapid solidification, and the extremely high cooling rate makes the Inconel718 alloy parts after forming generally have large local thermal stress, and the segregation of Nb element causes a large number of brittle Laves phases to precipitate, and the precipitation of γ", γ', and δ phases Defects such as microcracks are likely to occur in the remelted zone at the boundary of the suppressed melt channel. Generally, follow-up heat treatment is used to improve the above defects, but the effect is not ideal

In the prior art, there is no preparation method that can prepare Inconel718 alloy with mechanical properties such as strength, plasticity, and hardness at the same time, which limits its application in many fields

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