讲座名称：周惠久论坛——Laser Additive Manufacturing of Steels

时间：2026-05-12 10:00

地点：创新港校区 3号巨构（躬行楼）5020—瞪羚会议室

讲座人：张明星教授，1997年在澳大利亚昆士兰大学获得博士学位，此后一直在昆士兰大学工作，目前担任材料系主任。他专注于金属材料的研究，涵盖相变、凝固、晶粒细化、表面工程以及当前的增材制造。在攻读博士学位期间，首次提出了“edge-to-edge匹配模型”（E2EM），得到了国际同行广泛认可，并成功应用于铸造及增材制造新型晶粒细化剂及合金的开发。过去10年共获得澳大利亚研究理事会资助项10项及工业课题12项，研究经费超600万澳元。累计发表论文350多篇，被引用超过22000余次，H因子84。

讲座介绍：

The complicated thermal history of additive manufacturing (AM) leads to different microstructures of steels from their counterparts made by conventional processing. AM of 316 stainless steel is associated with coarse columnar structures, causing anisotropic properties. AM of H13 tool steel leads to the formation of elongated, high-carbon retained austenite films between martensite laths, resulting in high brittleness of the as-built H13 steel. To overcome this problem, we identified TiN as an effective inoculant for steel AM based on crystallographic calculation. The addition of 0.5 wt.% TiN nanoparticles not only eliminates property anisotropy, but also simultaneously increases the strength (tensile strength of 2051 ± 48 MPa) and ductility (elongation of elongation of 7.4 ± 0.7%) of laser AM-fabricated H13 steel. However, AM of 4340 steel produces equiaxed grains with isotropic properties comparable to forged steel.

In addition, AM of plain carbon steels can achieve tensile and impact properties comparable to, or even superior to, those of ultra-high-strength steels, including expensive maraging steels. This is attributed to the sequential micro-scale melting and solidification within AM melt pools, which provides sufficient cooling to directly form finer martensite or bainite. This process strengthens the steel while ensuring microstructural and property homogeneity without dimensional limitations, avoiding heat-treatment distortion and cracking typical of conventional production. This is equivalent to increased hardenability of plain carbon steels during AM.

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主办单位：

材料学院

金属材料强度全国重点实验室