H13钢表面激光熔覆H13合金涂层质量研究

发布时间：2018-04-12 22:42

本文选题：激光熔覆 + H合金涂层　；参考：《表面技术》2015年08期

【摘要】：目的研究获得高质量H13激光涂层的工艺。方法以H13合金粉末为熔覆材料,在H13钢退火基体表面制备H13合金涂层,采用均匀设计试验,利用金相法检测涂层的几何形貌参数,得到涂层宽度回归模型,并验证所建立模型的准确性。利用光学显微镜和扫描电镜分析涂层的显微组织形貌,对涂层成分进行分析,通过显微硬度计测试涂层截面的显微硬度分布。对涂层气孔、裂纹和成分偏析进行分析。结果扫描速度22 mm/s,激光功率1300 W,送粉速率21 g/min时,H13合金涂层与基体呈良好的冶金结合,涂层内组织均匀致密,无裂纹缺陷,截面显微硬度约600~699HV,是H13基体硬度的2.4~3倍。扫描速度14 mm/s,激光功率1400 W,送粉速率42 g/min时,涂层的截面显微硬度约为669~698HV,是基体的2.85~3倍。结论在两种工艺条件下,均能获得质量较优的H13合金涂层。
[Abstract]:Objective to study the process of high quality H 13 laser coating.Methods H13 alloy coatings were prepared on the annealed substrate of H13 steel with H13 alloy powder as cladding material. The uniform design test was used to detect the geometric parameters of the coating, and the regression model of coating width was obtained.The veracity of the model is verified.The microstructure and composition of the coating were analyzed by optical microscope and scanning electron microscope. The microhardness distribution of the coating cross-section was measured by microhardness meter.The porosity, crack and composition segregation of the coating were analyzed.Results the scanning speed was 22 mm / s, the laser power was 1300 W, and the powder feeding rate was 21 g/min. The microstructure of H13 alloy coating was uniform and compact, without crack defect, and the cross section microhardness was about 600,699 HVV, which was 2.4 ~ 3 times of that of H13 substrate.When the scanning speed is 14 mm / s, the laser power is 1400 W, and the powder feeding rate is 42 g/min, the cross section microhardness of the coating is about 669 998 HVV, which is 3 times of that of the substrate.Conclusion High quality H 13 alloy coatings can be obtained under both conditions.
【作者单位】：湖北汽车工业学院材料科学与工程学院;西安交通大学材料科学与工程学院;
【基金】：湖北省教育厅科学研究项目(Q20122302)~~
【分类号】：TG174.4

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