| 引用本文: | 周彬彬,卞祥宇,丁度,陆鼎,张万超,于鹏,业成,张伯君.Q345R表面钛涂层的激光熔覆制备及显微组织研究[J].材料科学与工艺,2022,30(6):53-59.DOI:10.11951/j.issn.1005-0299.20220083. |
| ZHOU Binbin,BIAN Xiangyu,DING Du,LU Ding,ZHANG Wanchao,YU Peng,YE Cheng,ZHANG Bojun.Microstructure of titanium coating on Q345R surface prepared by laser cladding[J].Materials Science and Technology,2022,30(6):53-59.DOI:10.11951/j.issn.1005-0299.20220083. |
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| Q345R表面钛涂层的激光熔覆制备及显微组织研究 |
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周彬彬1,卞祥宇1,丁度1,陆鼎1,张万超1,于鹏1,业成2,张伯君2
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(1.南京工业职业技术大学 工程技术实训中心,南京 210023;2.南京锅炉压力容器检验研究院 技术研发部,南京 210028)
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| 摘要: |
| 本文以采用铜为过渡层、表面激光熔覆钛涂层的Q345R钢板为研究对象,研究了各层凝固组织、结合界面显微组织、元素扩散行为及显微硬度,阐明了两个结合界面处显微组织及元素扩散行为的差异。研究发现,钛层组织为均匀分布的单一柱状树枝晶,与前一条熔覆轨迹交界处为不具备明显方向性的树枝晶,近界面处形成细小而紧密的等轴树枝晶。铜层中部区域的显微组织为典型柱状树枝晶,在铜/钢结合界面铜侧,显微组织表现为垂直于界面的细小树枝晶向细小等轴树枝晶的过渡,细小等轴树枝晶垂直方向的厚度约为20 μm。由于激光熔覆过程中强烈的热量影响,钢层存在明显的热影响区,该区域组织发生了重结晶或不完全重结晶,组织由粒状贝氏体、细小的铁素体和珠光体组成。远离界面处组织为典型的铁素体和珠光体组织,呈现带状分布。钛/铜结合界面存在熔合区,并存在显著的元素扩散行为,而铜/钢结合界面不存在熔合区,Cu、Fe元素在铜/钢结合界面处的含量急剧变化,扩散距离约为1~2 μm。显微硬度方面,结合界面的硬度实现了两侧材料硬度的过渡,有效避免了界面微裂纹的产生。 |
| 关键词: 激光熔覆技术 金属复合板 显微组织 元素扩散行为 显微硬度 |
| DOI：10.11951/j.issn.1005-0299.20220083 |
| 分类号:TG406 |
| 文献标识码:A |
| 基金项目:南京工业职业技术大学科研启动项目(YK20-14-05)；南京工业职业技术大学大学生创新创业训练计划项目、江苏省高等学校大学生创新创业训练计划项目(202110850036Y). |
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| Microstructure of titanium coating on Q345R surface prepared by laser cladding |
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ZHOU Binbin1,BIAN Xiangyu1,DING Du1,LU Ding1,ZHANG Wanchao1,YU Peng1,YE Cheng2,ZHANG Bojun2
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(1.Engineering Technology Training Center, Nanjing Vocational University of Industry Technology, Nanjing 210023, China; 2.Technology Research and Development Department, Nanjing Boiler and Pressure Vessel Inspection Institute, Nanjing 210028, China) [HJ0.4mm]
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| Abstract: |
| The solidification structure, bonding interface microstructure, element diffusion behavior, and micro-hardness of Q345R steel plate with copper as transition layer and laser cladding titanium coating on the surface were studied. The differences in the microstructure and element diffusion behavior between the two bonding interfaces were clarified. Results show that the structure of titanium layer was single columnar dendrite with uniform distribution, and small and compact equiaxed dendrite formed near the interface. The junction with the previous cladding track was dendrite without obvious directivity. The microstructure at the middle area of copper layer was typical columnar dendrite. For the copper side of copper/steel bonding interface, the microstructure showed the transition from fine dendrite to equiaxed dendrite, which was perpendicular to the interface. The thickness of equiaxed dendrites in the vertical direction was about 20 μm. Due to the strong heat effect in the laser cladding process, there was an obvious heat affected zone at the steel layer, where the microstructure was recrystallized or incompletely recrystallized, and composed of granular bainite, fine ferrite, and pearlite. The microstructure far away from the interface was typical ferrite and pearlite, showing banded distribution. There was a fusion zone at the titanium/copper bonding interface, with significant element diffusion behavior, while there was no fusion zone at the copper/steel bonding interface. The content of Cu and Fe elements at the copper/steel bonding interface changed sharply, and the diffusion distance was about 1~2 μm. In terms of micro-hardness, combined with the hardness of the interface, the hardness transition of the materials on both sides was realized, and the occurrence of interface micro-cracks was effectively avoided. |
| Key words: laser cladding technology metal clad plate microstructure element diffusion behavior micro-hardness |
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