Surface Flattening and Nanostructuring of Steel by Picosecond Pulsed Laser Irradiation

Tomoki Kobayashi, Hiroshi Sera, Tomohiro Wakabayashi, Haruyuki Endo, Yuichi Takushima, Jiwang Yan

研究成果: Article査読

12 被引用数 (Scopus)


Steel is used as a mold material for press/injection molding of plastic products. High accuracy and releasing ability are required for a steel mold surface. This paper proposes a surface finishing method for steel molds by using picosecond pulsed laser irradiation. The process involves two steps: one is surface flattening by removing the surface asperity through laser ablation, and the other is forming nanoscale laser-induced periodic surface structures (LIPSS) on the flattened surface. The two steps are realized by using the same laser at controlled laser fluence and focus position. Experimental results showed that LIPSS was successfully formed after surface flattening under specific ranges of laser fluence and defocus length. Furthermore, plastic forming experiments demonstrated that a steel surface with LIPSS significantly decreased the effective contact area and, in turn, reduced the mold releasing force. These findings provide the possibility of fabricating high-performance steel molds by picosecond pulsed laser irradiation.

ジャーナルNanomanufacturing and Metrology
出版ステータスPublished - 2018 12月 1

ASJC Scopus subject areas

  • 産業および生産工学
  • 機械工学
  • 材料科学(その他)


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