Effect of denudation zone on ambient pressure for development of SLM in vacuum

Masahiro Ihama; Yuta Mizuguchi; Norio Yoshida; Yuji Sato; Masahiro Tsukamoto

doi:10.1117/12.2608408

4 March 2022 Effect of denudation zone on ambient pressure for development of SLM in vacuum

Masahiro Ihama, Yuta Mizuguchi, Norio Yoshida, Yuji Sato, Masahiro Tsukamoto

Proceedings Volume 11992, Laser 3D Manufacturing IX; 1199204 (2022) https://doi.org/10.1117/12.2608408
Event: SPIE LASE, 2022, San Francisco, California, United States

Abstract

A 316L stainless steel [SS316L] plate was fabricated without pores by selective laser melting (SLM) in a vacuum. SS316L has excellent properties such as high corrosion resistance and hardness, but forming complicated structures is challenging due to difficulties working the material. SLM forms a 3D material by building it layer by layer. In SLM process, a denudation zone is caused to form near the laser scan path while laser irradiation. The denudation zone caused to form a layer having an un-uniform thickness and also leads to a decrease accuracy of fabrication. There are many unknown controlling factors about the basis of denudation zone generation. In this study, in order to clarify the mechanism of the denudation zone formation process, SS316L is fabricated by SLM in a vacuum and the width of denudation zone is measured by microscope. The ambient pressure is varied from 10 Pa to 10 ⁵ Pa using a vacuum pump, and argon gas. As the results, at the ambient pressure of 10⁵ Pa, the width of denudation zone is 0.81 mm, and the width of denudation zone at 300 Pa was improved to 0.27 mm. It is clarified that the width of denudation decreases with the decrease of the ambient pressure.

Conference Presentation

Citation Download Citation

Masahiro Ihama, Yuta Mizuguchi, Norio Yoshida, Yuji Sato, and Masahiro Tsukamoto "Effect of denudation zone on ambient pressure for development of SLM in vacuum", Proc. SPIE 11992, Laser 3D Manufacturing IX, 1199204 (4 March 2022); https://doi.org/10.1117/12.2608408

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