| LI Jun,YANG Li-jun,ZHENG Hang,JIANG Ze-rui,SUI Ze-hui.Influence of Laser Selection Melting Times on the Surface Properties of 316L Stainless Steel[J],50(6):93-100 |
| Influence of Laser Selection Melting Times on the Surface Properties of 316L Stainless Steel |
| Received:June 20, 2020 Revised:November 03, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.06.009 |
| KeyWord:Laser selective melting 316L stainless steel laser remelting surface roughness surface hardness |
| Author | Institution |
| LI Jun |
Shaanxi University of Science & Technology, Xi'an , China |
| YANG Li-jun |
Shaanxi University of Science & Technology, Xi'an , China |
| ZHENG Hang |
Shaanxi University of Science & Technology, Xi'an , China |
| JIANG Ze-rui |
Shaanxi University of Science & Technology, Xi'an , China |
| SUI Ze-hui |
Shaanxi University of Science & Technology, Xi'an , China |
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| Abstract: |
| By controlling the number of laser melting times in selected areas, to study its influence on the crystalline phase, chemical composition and physical properties of the 316L stainless steel surface, and to obtain a 316L stainless steel surface with excellent comprehensive properties. Under the conditions of laser power 80 W, laser scanning speed 500 mm/s, molding thickness 0.03 mm, and scanning pitch 0.06 mm, the number of melting times is controlled during laser selective melting (SLM) molding, and it is passed through an optical microscope (OM), Scanning electron microscope (SEM), X-ray diffractometer (XRD), backscattered electron diffractometer (EBSD), digital micro-hardness tester and DSF900 surface profile roughness tester and other instruments for testing. The results show that with the increase of the number of laser remelting:the macro solidification structure is significantly refined, the grains become larger, and the second phase distribution is more dispersed; the content of the Cr0.19Fe0.7Ni0.11 alloy compound also increases, and the remelting 3 times later, the content of Cr0.19Fe0.7Ni0.11 alloy compounds tends to be stable; the proportion of low-∑CSL grain boundaries increases, but the proportion of low-∑CSL grain boundaries is still higher than that of other remelted low stacking energy alloy materials. Low surface hardness increases rapidly and then tends to be stable. The maximum hardness after remelting is 316.9HV and the minimum hardness after remelting is 265.9HV; the surface roughness decreases first and then increases, and the minimum roughness after remelting is 3, Ra is 8.076 μm, and the maximum roughness Ra of 5 times of remelting is 17.228 μm. With the increase of the number of laser melting times, the surface performance of 316L stainless steel has been improved; but when the number of melting times is too much, overmelting and splashing will occur, which will reduce the surface performance of stainless steel. |
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