李俊,杨立军,郑航,蒋泽睿,隋泽卉.激光选区熔化次数对316L不锈钢表面性能的影响[J].表面技术,2021,50(6):93-100.
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].Surface Technology,2021,50(6):93-100 |
| 激光选区熔化次数对316L不锈钢表面性能的影响 |
| Influence of Laser Selection Melting Times on the Surface Properties of 316L Stainless Steel |
| 投稿时间：2020-06-20 修订日期：2020-11-03 |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.06.009 |
| 中文关键词: 激光选区熔化 316L不锈钢 激光重熔 表面粗糙度 表面硬度 |
| 英文关键词:Laser selective melting 316L stainless steel laser remelting surface roughness surface hardness |
| 基金项目:西安市未央区科技计划项目(202030);陕西省教育厅专项科研计划项目(2020KJRC0008) |
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| Author | Institution |
| LI Jun | Shaanxi University of Science & Technology, Xi'an 710021, China |
| YANG Li-jun | Shaanxi University of Science & Technology, Xi'an 710021, China |
| ZHENG Hang | Shaanxi University of Science & Technology, Xi'an 710021, China |
| JIANG Ze-rui | Shaanxi University of Science & Technology, Xi'an 710021, China |
| SUI Ze-hui | Shaanxi University of Science & Technology, Xi'an 710021, China |
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| 中文摘要: |
| 目的 通过对激光选区熔化次数的控制，研究其对316L不锈钢表面晶相、化学成分和物理性能的影响规律，并最终获得综合性能优良的316L不锈钢表面。方法 在激光功率80 W、激光扫描速度500 mm/s、成形厚度0.03 mm、扫描间距0.06 mm条件下，通过改变激光选区熔化次数成形试件，并通过光学显微镜(OM)、电子扫描显微镜(SEM)、X射线衍射仪(XRD)、背散射电子衍射仪(EBSD)、数字式显微硬度计和DSF900表面形状粗糙度测定机等对试件上表面进行检测。结果 发现随着激光重熔次数增加，宏观凝固组织明显细化，晶粒变大，第二相分布愈加弥散;Cr0.19Fe0.7Ni0.11合金化合物的含量也随之增加，重熔3次以后，Cr0.19Fe0.7Ni0.11合金化合物的含量趋于稳定;低-∑CSL晶界的比例随之增加，但相对于其他重熔后的低层错能合金材料，低-∑CSL晶界的比例还较低;试件表面硬度先急剧增加，随后趋于稳定，重熔5次时，硬度最大，为316.9HV，重熔1次时，硬度最小，为265.9HV;表面粗糙度先减小后增大，重熔2次时粗糙度最小，此时Ra为8.076 μm，重熔5次时，粗糙度最大，Ra为17.228 μm。结论 随着激光选区熔化次数的增加，316L不锈钢表面性能得到了改善。但熔化次数过多，会产生过熔和飞溅现象，使不锈钢表面性能下降。 |
| 英文摘要: |
| 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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