Shi Yuanyuan*,Luo Yufeng.Study on surface protection and properties of light rail building steel structure[J].Plating & Finishing,2023,(3):60-67.[doi:10.3969/j.issn.1001-3849.2023.03.009]
轻轨建筑钢结构的表面防护与性能研究
- Title:
- Study on surface protection and properties of light rail building steel structure
- Keywords:
- laser cladding ; WC ; TiN ; microstructure ; friction and wear ; corrosion
- 分类号:
- TG174.4
- 文献标志码:
- A
- 摘要:
- 对轻轨钢结构用 Q345 钢进行了表面激光熔覆，对比分析了 GH 625 熔覆层和添加不同含量 WC 和 TiN 熔覆层的显微形貌、物相组成、拉伸性能、电化学性能和耐磨性能。结果表明， GH625 熔覆层的物相主要为 γ -Ni 、 FeNi 3 、 M 23 C 6 和 NbC ；熔覆层中 WC 含量增加至 10% 及以上时，熔覆层中还出现了 WC 、 W 2 C 、 M 6 C 相； 5%TiN 和 10%TiN 熔覆层的物相为 γ -Ni 、 FeNi 3 、 TiN 、 NbC 和 M 23 C 6 相。在 GH625 中添加一定含量的 WC 或者 TiN 后可以抑制晶粒长大和熔覆层中 Laves 相的形成。 WC 熔覆层和 TiN 熔覆层的耐腐蚀性能都优于 Q345 钢和 GH625 熔覆层，且 15%WC 熔覆层的耐腐蚀性能最好； Q345 和熔覆层的磨损失重从小至大顺序为： 15%WC<5%TiN<20%WC<10%WC<10%TiN< 5%WC
- Abstract:
- ： The surface laser cladding of Q345 steel for light rail steel structure was carried out. The microstructure ， phase composition ， tensile properties ， electrochemical properties and wear resistance of GH 625 cladding layer and cladding layers with different content of WC and TiN were compared and analyzed. The results show that the main phase of the GH625 cladding layer is γ -Ni ， FeNi 3 ， M 23 C 6 and NbC ； when the WC content in the cladding layers increases to 10% or more ， WC ， W 2 C and M 6 C phases also appear in the cladding layers ； the phase of 5%TiN and 10%TiN cladding layers is γ -Ni ， FeNi 3 ， TiN ， NbC and M 23 C 6 . Adding a certain amount of WC or TiN to GH625 can inhibit the grain growth and the formation of Laves phase in the cladding layers. The corrosion resistance of WC cladding layers and TiN cladding layers is better than those of Q345 steel and GH625 cladding layer ， and the corrosion resistance of 15%WC cladding layer is the best ； the order of wear losses of Q345 and cladding layers from small to large are ： 15%WC < 5%TiN < 20%WC < 10%WC < 10%TiN < 5%WC < GH625 < Q345 ， so the wear resistance of cladding layers is better than that of Q345 steel ， and 15%WC cladding layer has the best wear resistance. The wear mechanism is adhesive wear and slight abrasive wear.
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备注/Memo
收稿日期： 2021-02-10 修回日期： 2022-03-22 作者简介： 石圆圆（ 1987 —），女，副教授， email ： 18704409366@139.com 基金项目： 2022 年度吉林省教育厅社会科学研究规划项目（ JJKH20221322SK ）