一种增材制造Fe-Mn-Ni基马氏体时效钢及其制备方法

By designing the composition of Fe-Mn-Ni based martensitic aging steel and using LPBF technology, combined with high-temperature tempering treatment, a submicron-scale martensite and austenite interwoven structure is formed, solving the problems of high cost and performance imbalance in additive manufacturing of martensitic aging steel, and achieving a combination of high strength and excellent plasticity.

CN121951387BActive Publication Date: 2026-07-17CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CENT SOUTH UNIV
Filing Date
2026-04-03
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing additive manufacturing of martensitic aging steels suffers from high costs and limited performance control, especially the imbalance between strength and elongation. Furthermore, traditional designs with high Ni and Co content lead to high material costs and are prone to microcracks and deterioration of weldability.

Method used

Fe-Mn-Ni based martensitic aging steel is used. By replacing Ni with an appropriate amount of Mn and combining Al, Ti and Mo elements, strengthening phases such as NiAl and Ni3Ti are formed. Through LPBF technology and high-temperature tempering treatment, a submicron-scale martensite and austenite interwoven structure is formed, achieving a combination of high strength and excellent plasticity.

Benefits of technology

It effectively reduces material costs, improves printability, and broadens the printing process window. The material has high density, few defects, high strength, and excellent plasticity, solving the problem of insufficient strength in traditional martensitic aging steel.

✦ Generated by Eureka AI based on patent content.

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Abstract

本发明公开了一种增材制造Fe‑Mn‑Ni基马氏体时效钢及其制备方法。该时效钢按质量百分比计的化学组成为：Mn 8%‑12%，Ni 3%‑7%，Al 1%‑3%，Mo 0.5%‑1.5%，Ti 0.25%‑1.25%，余量为Fe和不可避免的杂质。本发明采用Mn部分替代Ni，在确保马氏体基体的同时，引入稳定奥氏体以实现材料的强韧性平衡；同时，利用Al、Mo、Ti元素的协同作用，在时效过程中形成高密度的纳米级析出相来保证材料的强度。该合金实现了马氏体时效钢的无Co化，大幅降低了原料成本。经优化后，该材料可获得不低于1250 MPa的抗拉强度与不低于20%的断后伸长率，实现了强度与塑性的优异平衡。
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