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<p>In this paper, 18Ni300 maraging steel (MS) and 316L stainless steel (SS) laminated heterostructured material (LHM) was fabricated by wire arc directed energy deposition. Furthermore, the mixed thin wall combining both materials was fabricated using a common molten pool arc ignition additive manufacturing method. A comparison revealed that the composition and microstructure of the mixed thin wall are largely consistent with the various regions of the LHM. The 18Ni300 MS region consists of martensite and austenite, while the 316L SS region contains only austenite. The LHM exhibits the same texture type but has different strength compared to a single-material thin wall. The tensile properties of LHM surpassed the mixing laws when compared to the mixed thin wall, due to hetero-deformation induced (HDI) strengthening with geometrically necessary dislocations (GNDs) stacking at the interfaces. The HDI stress in LHM is higher than that in both mixed thin walls. Stress-induced martensitic transformation increases martensite in the 18Ni300 MS region. The path in this region is more tortuous because martensite is harder and better at hindering cracks than austenite. The differing properties of the two materials result in shear dimples on the fracture surfaces.</p>

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Microstructure and mechanical properties of laminated heterostructured material fabricated by wire arc directed energy deposition and synergistic effects of strength and ductility

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Zhanlin Ma,
  • Yangling Ou,
  • Junqiang Xu,
  • Qianli Zhu,
  • Runchang Liu,
  • Xiaotian Zhang,
  • Zhen Wang,
  • Qi Zhou,
  • Yong Peng,
  • Kehong Wang

摘要

In this paper, 18Ni300 maraging steel (MS) and 316L stainless steel (SS) laminated heterostructured material (LHM) was fabricated by wire arc directed energy deposition. Furthermore, the mixed thin wall combining both materials was fabricated using a common molten pool arc ignition additive manufacturing method. A comparison revealed that the composition and microstructure of the mixed thin wall are largely consistent with the various regions of the LHM. The 18Ni300 MS region consists of martensite and austenite, while the 316L SS region contains only austenite. The LHM exhibits the same texture type but has different strength compared to a single-material thin wall. The tensile properties of LHM surpassed the mixing laws when compared to the mixed thin wall, due to hetero-deformation induced (HDI) strengthening with geometrically necessary dislocations (GNDs) stacking at the interfaces. The HDI stress in LHM is higher than that in both mixed thin walls. Stress-induced martensitic transformation increases martensite in the 18Ni300 MS region. The path in this region is more tortuous because martensite is harder and better at hindering cracks than austenite. The differing properties of the two materials result in shear dimples on the fracture surfaces.