High-strength stainless steel powder based on slm process and preparation method thereof

Abstract

A high-strength stainless steel powder based on an SLM process and a preparation method thereof belong to the field of metal materials for additive manufacturing. The chemical composition of the powder is: C: <0.03%, Cr: 12.0-13.0%, Ni: 8.0-10.0%, Mo: 2.0-2.5%, Al: 0.8-1.2%, Y: 0.02-0.10% , Si: <0.1%, Mn: <0.01%, P: <0.005%, S: <0.002%, O: <0.020%, and the balance is Fe and unavoidable impurities. The manufacturing process includes: master alloy preparation, vacuum induction melting gas atomization method powder making, mechanical vibration and airflow classification sieving and collection under the protection of inert gas. The advantage is that, compared with the prior art, the fine powder yield of the powder of the present invention in the particle size range of 15-53 μm required by the SLM process is significantly improved, the powder has good sphericity, low oxygen content and impurity content, and can be used as a The powder consumables of high-strength and complex precision components used in SLM printing in the field can also be extended to related fields such as medical treatment and marine engineering.

Description

technical field [0001] The invention belongs to the field of metal materials for additive manufacturing, and in particular provides a high-strength stainless steel powder based on an SLM process and a preparation method thereof. Background technique [0002] Additive manufacturing (3D printing) has technical advantages such as not being restricted by the complexity of parts, high material utilization rate and significantly shortening the development cycle, and has become one of the most potential manufacturing technologies in the future. At present, metal additive manufacturing technologies mainly include selective laser melting technology (SLM), laser net shaping technology (LENS), and electron beam melting technology (EBM). Among them, because the parts printed by SLM technology have the advantages of complex structure and high dimensional accuracy, they are widely used in the fields of aerospace and medical equipment with precision and complex parts, which is also the mos...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a high-strength stainless steel powder based on the SLM process and its preparation method. Through the alloy composition, smelting method and matching powder-making process design, a high-strength stainless steel metal powder based on the SLM process is manufactured. Solve the domestic SLM additive manufacturing field, especially the material selection bottleneck of high-strength metal powder consumables

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