Ti-Modified additively manufactured 316L stainless steel: microstructural refinement and superior mechanical properties

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-06-13 DOI:10.1016/j.matchar.2025.115295

T. Nong , Y.C. Guo , T. Xiong , Z.C. Lu , L. Yu , X.D. Nong

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Abstract

This study investigates the effect of Ti modification on the microstructure and mechanical properties of 316L stainless steel fabricated by laser powder bed fusion (L-PBF), aiming to enhance its mechanical strength for structural applications. The incorporation of Ti led to a pronounced refinement in microstructure, primarily due to the formation of Ti(C,N,O) nanoparticles that served as heterogeneous nucleation sites. As a result, the yield strength of the Ti-modified L-PBF 316L increased to 637 ± 3 MPa, and the ultimate tensile strength reached 837 ± 5 MPa, representing enhancements of 11.56% and 15.77%, respectively, over the unmodified L-PBF 316L. Notably, the total elongation remained at a high level, indicating a balance between strength and ductility. The enhanced mechanical properties are primarily attributed to the combined effects of grain boundary strengthening and Orowan strengthening from the Ti(C,N,O) nanoparticles.

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ti改性增材制造316L不锈钢：组织细化，力学性能优越

研究了Ti改性对激光粉末床熔合316L不锈钢组织和力学性能的影响，旨在提高其机械强度，以供结构应用。Ti的掺入导致微观结构的明显细化，主要是由于Ti（C，N，O）纳米颗粒的形成作为非均相成核位点。结果表明，经ti改性的L-PBF 316L的屈服强度达到637±3 MPa，抗拉强度达到837±5 MPa，分别比未改性的L-PBF 316L提高了11.56%和15.77%。值得注意的是，总伸长率保持在较高水平，表明强度和延性之间的平衡。Ti（C，N，O）纳米颗粒的晶界强化和Orowan强化共同作用增强了材料的力学性能。

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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.