黄海博,孙文磊,黄勇.超高速激光熔覆Fe基非晶合金单道工艺分析[J].表面技术,2022,51(7):410-419.
HUANG Hai-bo,SUN Wen-lei,HUANG Yong.Analysis on the Process of Single Track Fe Based Amorphous Alloy during Ultra High Speed Laser Cladding[J].Surface Technology,2022,51(7):410-419 |
| 超高速激光熔覆Fe基非晶合金单道工艺分析 |
| Analysis on the Process of Single Track Fe Based Amorphous Alloy during Ultra High Speed Laser Cladding |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.07.041 |
| 中文关键词: 超高速激光熔覆 铁基非晶合金 熔覆宽度 稀释率 显微组织 |
| 英文关键词:ultra high speed laser cladding Fe based amorphous alloy cladding width dilution ratio microstructure |
| 基金项目:自治区重点研发计划项目(2020B02014);自治区重点实验室开放基金(2020520002);新疆工程学院科研基金项目(2019xgy152112) |
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| 中文摘要: |
| 目的 利用超高速激光熔覆工艺制备Fe基非晶合金。方法 利用专用模具制备0.4、0.5、0.6 mm不同厚度预置涂层，并用质量分数为4%的聚乙烯醇将涂层与基材黏接，在真空环境下烘干。然后，设计正交试验分析预置厚度、激光功率和扫描速度对Fe–Si–B非晶粉末材料单道熔覆宽度的影响，并利用超景深显微镜和极差分析法分析工艺参数对涂层稀释率的影响次序。最后，对样件磨抛和腐蚀，借助扫描电子电镜分析涂层显微组织。结果 利用超高速激光熔覆制备涂层，单道涂层宽度与激光功率大小呈正相关关系。涂层稀释率变化区间为8.8%~12.1%，影响涂层稀释率的工艺次序为预置厚度>激光功率>扫描速率。所制备的涂层与基材形成良好的冶金结合，但涂层底部出现了晶化现象，晶粒尺寸分布区间为0.5~3.5 μm。将工艺因素归一化考虑，涂层晶粒大小受激光能量密度影响较大。结论 涂层底部凝固速率较低和成分偏析是造成晶化的重要原因，在预置厚度0.6 mm、激光功率500 W、扫描进给量6 000工艺下的晶化程度最小，将激光能量密度控制在10 W/mm3以下，有利于抑制晶化现象。 |
| 英文摘要: |
| To prepare Fe based amorphous alloys by ultra high speed laser cladding, in this paper, the preset powder coatings with different thickness of 0.4 mm, 0.5 mm and 0.6 mm were prepared by special mold. Next, the coatings were bonded to the substrate with 4% polyvinyl alcohol and dried under the vacuum condition. Then, the orthogonal experiment was designed to analyze the effect of preset thickness, laser power and scanning speed on the single pass cladding width of Fe-Si-B amorphous powder material, also the effect of process parameters on the coating dilution ratio was analyzed by depth of field optical microscope and extremum difference analysis. At last, the microstructure of the coating was analyzed by means of scanning electron microscope (SEM). Results showed that there was a positive correlation between coating width and laser power; the range of coating dilution ratio was 8.8%-12.1%, and the descending order were as follows:preset thickness, laser power and scanning rate. The coating has good metallurgical bonding with the substrate, but there exists crystallization region at the bottom of the coating, which size is 0.5-3.5 μm. Considering the normalization of process factors, the grain size of the coating is greatly affected by the laser energy density, further analysis, the low solidification rate and composition segregation at the bottom of the coating are the important reasons for the crystallization. Compared the result of each process, crystallization degree is the lowest when the preset thickness is 0.6 mm, laser power is 500 W, and scanning feed is 6 000, and it is beneficial to restrain the crystallization when the laser energy density is controlled below 10 W/mm3. |
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