Synergistic regulation of nano-precipitates and reversed austenite in titanium-free maraging steel by low-temperature solution treatment and double aging treatment

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2024-11-06 DOI:10.1016/j.matchar.2024.114499

Xin Liu, Zheye Liu, Ye Zhang, Yu Xiao, Zhiyuan Feng, Kaiyu Zhang, Wanliang Zhang, Chengshuang Zhou, Lin Zhang

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Abstract

To synergistically enhance the strength and toughness of titanium-free maraging steel, a multi-scale characterization method was used to illustrate the effects of low-temperature solution treatment and double aging treatment on the microstructure of titanium-free maraging steel in this paper. After the low-temperature solution treatment and the double aging treatment, the tensile strength of titanium-free maraging steel increased from 1954 MPa to 2160 MPa and the elongation increased by 8.95 %. By the low-temperature solution treatment, the original austenite grain size of the titanium-free maraging steel was refined to 0.69 μm. The double aging treatment promoted the diffusion of Mo and Ni elements, increased the volume fraction of ω phase, Ni₃Mo nano-precipitation phase and reversed austenite, and refined the size of ω phase and Ni₃Mo by 14.2 % and 7.9 %, respectively. The nanoparticles of titanium-free maraging steel mainly include the ω phase, Ni₃Mo and Laves phase. The strengthening mechanism of nanoparticles was quantitatively evaluated from the shear mechanism and Orowan dislocation loop mechanism. The mechanism shows that the ω phase is the main contributor to the overall precipitation strengthening. Therefore, low-temperature solution treatment and double aging treatment provide a potential solution for achieving high strength and high toughness in maraging steel.

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低温固溶处理和双时效处理对无钛马氏体时效钢中纳米沉淀物和反转奥氏体的协同调控

为了协同提高无钛马氏体时效钢的强度和韧性，本文采用多尺度表征方法说明了低温固溶处理和双时效处理对无钛马氏体时效钢微观组织的影响。经过低温固溶处理和双时效处理后，无钛马氏体时效钢的抗拉强度从 1954 MPa 提高到 2160 MPa，伸长率提高了 8.95%。通过低温固溶处理，无钛马氏体时效钢的原始奥氏体晶粒尺寸细化至 0.69 μm。双时效处理促进了 Mo 和 Ni 元素的扩散，提高了 ω 相、Ni3Mo 纳米沉淀相和反转奥氏体的体积分数，使 ω 相和 Ni3Mo 的尺寸分别细化了 14.2 % 和 7.9 %。无钛马氏体时效钢的纳米颗粒主要包括ω相、Ni3Mo 和 Laves 相。从剪切机制和奥罗万位错环机制出发，对纳米颗粒的强化机制进行了定量评估。该机制表明，ω相是整个析出强化的主要贡献者。因此，低温固溶处理和双时效处理为实现马氏体时效钢的高强度和高韧性提供了一种潜在的解决方案。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.