High strength and plasticity of periodic heterostructured 304 L steel fabricated by laser penetration strip (LPS) AM technology

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

Materials Characterization Pub Date : 2025-04-11 DOI:10.1016/j.matchar.2025.115036

Yongqiang Zhang , Yongxin Lu , Pubo Li , Gang Shen

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引用次数: 0

Abstract

In order to overcome the contradiction between additive efficiency and higher laser power and wall thickness limit, and to obtain the desired heterostructured thin-walled components, an innovative laser penetration strip additive manufacturing (LPS AM) technology is presented. We apply the LPS AM technology to the direct fabrication of thin-walled 304 L steel with heterogeneous lamellar structures (HLS), which consisting of periodic equiaxed grain regions (EGR) and columnar grain regions (CGR). EGR presents a spherical austenite matrix with some nano-sized irregular ferrite grains, while CGR presents columnar austenite grains segmented by banded/globular ferrites of different sizes to form a special nano-columnar biphase structure. Periodic HLS 304 L, with non-uniform grain sizes and different phases ranging from nanometers to micrometers, provides a synergistic strengthening effect and strain distribution capability, achieving high Heterogeneous Deformation Induced (HDI) strengthening and hardening. The TRIP effect, HDI strengthening and HDI strain hardening contribute to high strength and plasticity for HLS 304 L alloy. This innovative approach has the potential to be applied to the production of other thin-walled alloys with hierarchical structures and superior strength.

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采用激光熔透带增材制造工艺制备高强度、高塑性的周期性异质钢304 L

为了克服增材效率与更高的激光功率和壁厚限制之间的矛盾，获得理想的异质薄壁构件，提出了一种创新的激光穿透带材增材制造（LPS AM）技术。应用LPS增材制造技术直接制备了由周期等轴晶区（EGR）和柱状晶区（CGR）组成的非均质层状组织（HLS）薄壁304 L钢。EGR表现为球状奥氏体基体和一些纳米级不规则铁素体晶粒，而CGR表现为柱状奥氏体晶粒被不同尺寸的带状/球状铁素体分段，形成特殊的纳米柱状双相结构。周期性HLS 304 L具有非均匀晶粒尺寸和不同相（从纳米到微米），提供了协同强化效应和应变分布能力，实现了高的非均质变形诱导（HDI）强化和硬化。TRIP效应、HDI强化和HDI应变硬化使HLS 304 L合金具有较高的强度和塑性。这种创新的方法有潜力应用于生产其他薄壁合金的分层结构和优越的强度。

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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.