表面激光熔覆对体育器材硬度的改善北大核心CSCD

为了能够明确激光熔覆技术对体育器材硬度的改善效果,提出分别从复合涂层、层间停光时间以及激光扫描速度方面变量参数进行硬度影响分析,研究三氧化二铝含量对复合熔覆层形貌、显微硬度和耐磨性能的影响,多层熔覆对激光熔覆层微观组织和硬度的影响,激光扫描速度对熔覆层宏观形貌、相组成、显微组织、成分及硬度分布等影响。进行了理论分析和实验验证,结果表明,随熔覆层表面距离增加,激光熔覆层显微硬度会减小,器材硬度会呈现出先增加后减小趋势;第二层熔覆距离降低使第一层中硬度随距离减少而提高;通过增大扫描速度,熔覆层的组织有细化趋势,组织不均匀性得到改善,同时熔覆层厚度降低,稀释率减小,使熔覆层平均硅含量提高,显微硬度改善。

Improvement of hardness of sports equipmentby surface laser cladding

In order to clarify the improvement effect of laser cladding technology on the hardness of sports equipment,the influence of variable parameters including composite coating,inter layer stop time and laser scanning speed on the hardness were analyzed.The influence of aluminum oxide content on the morphology,microhardness and wear resistance of composite cladding layer were studied.What′s more,the effects on multi-layer cladding on the microstructure and hardness of laser cladding layer were researched.And the effects of laser scanning speed on the morphology,phase composition,microstructure,composition and hardness distribution of the cladding layer were investigated.Theoretical analysis and experimental verification are carried out.The results show that with the increase of cladding layer surface distance,the microhardness of laser cladding layer will decrease,and the hardness of equipment will increase first and then decrease;the hardness of the first layer will increase with the decrease of cladding distance of the second layer;with the increase of scanning speed,the microstructure of cladding layer will be refined,and the inhomogeneity of microstructure will be improved.At the same time,the thickness of the cladding layer decreases and the dilution ratio decreases,which increases the average silicon content and improves the microhardness of the cladding layer.