Technology Tech Breakthrough

Jinan University Study Confirms High-Efficiency Fabrication of Stainless Steel CX via Large-Layer-Thick Coarse-Powder LPBF

2026-05-18

A joint research team from Jinan University has achieved near-full-density precipitation-hardening stainless steel CX with balanced strength and impact toughness in laser powder bed fusion (LPBF) by optimizing process parameters with 80μm and 100μm layer thicknesses and coarse powder particles. Densities reached 99.99% for both layer thicknesses, effectively addressing low forming efficiency and high material cost challenges in tool steel LPBF. Microstructural analysis revealed that horizontally oriented samples exhibited finer grains, higher austenite content, and superior yield strength and ductility compared to vertical samples. Increasing layer thickness from 80μm to 100μm led to a slight decrease in impact toughness due to minimally increased porosity. The coarse powder plus large layer thickness process significantly enhances forming efficiency and reduces material cost without sacrificing densification, offering direct engineering value for additive manufacturing of tool steels.

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暨南大学研究证实大层厚粗粉LPBF可高效制造不锈钢CX

暨南大学联合研究团队通过工艺参数优化，在激光粉末床熔融（LPBF）工艺中，采用80μm和100μm层厚、粗粉颗粒制备出近乎全致密且强度与冲击韧性兼顾的沉淀硬化不锈钢CX。两种层厚下致密度均达到99.99%，有效解决了LPBF在工具钢领域成形效率低、材料成本高的问题。微观组织分析表明，水平试样晶粒更细、奥氏体含量更高，屈服强度和延展性优于垂直试样。层厚从80μm增至100μm时，因孔隙率略有上升，冲击韧性轻微降低。粗粉+大层厚工艺可在不牺牲致密度的前提下显著提升成形效率、降低材料成本，对工具钢增材制造具有直接工程应用价值。

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