| HUANG Ming-ji,YANG Ying-chao,FENG Shao-chuan.Effect of 316L SLM Forming Process on Sliding Wear Characteristics and Hardness[J],49(1):221-227 |
| Effect of 316L SLM Forming Process on Sliding Wear Characteristics and Hardness |
| Received:August 19, 2019 Revised:January 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.01.026 |
| KeyWord:SLM 316L stainless steel process parameters surface roughness porosity friction wear hardness |
| Author | Institution |
| HUANG Ming-ji |
University of Science and Technology Beijing, Beijing , China |
| YANG Ying-chao |
University of Science and Technology Beijing, Beijing , China |
| FENG Shao-chuan |
University of Science and Technology Beijing, Beijing , China |
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| Abstract: |
| The work aims to improve the wear resistance and hardness of 316L stainless steel formed by selective laser melting (SLM). In the range of energy density 50 to 110 J/mm3 and hatch space 0.04 to 0.12 mm, 12 kinds of 316L stainless steel samples were prepared through SLM by changing the energy density and hatch space. The effects of process parameters on the wear characteristics and hardness of SLM-formed 316L stainless steel samples were investigated by surface roughness masurement, porosity measurement, pin-on-disk friction test and Brinell hardness test. When the energy density was 90 J/mm3 and the hatch space was 0.12 mm, the surface roughness was the smallest, reaching 5700 nm. When the porosity ranged from 12.35% to 0.94%, and the porosity of the sample with hatch space of 0.12 mm was smaller than that of sample with the hatch space of 0.04 mm and 0.08 mm. When hatch space remained unchanged, the porosity decreased as the energy density increased. When the energy density was 50 J/mm3, the friction coefficient and wear rate of samples with hatch space of 0.12 mm were smaller than those with s hatch space of 0.04 mm and 0.08 mm. When the energy density remained unchanged, the hardness of the sample with hatch space of 0.12 mm was higher than that with hatch space of 0.04 mm and 0.08 mm. The surface roughness and porosity of the molded samples are affected directly by the change of hatch space and energy density. The surface roughness and porosity decrease with the increase of hatch space. Wear and hardness have correlation with porosity: the smaller the porosity, the greater the hardness and the smaller the wear rate. Therefore, the reasonable selection of process parameters can reduce porosity, thereby improving surface quality, reducing wear rate and increasing hardness. |
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