粉末流量对铝合金表面高速激光熔覆铁基熔覆层性能的影响  

Effect of Powder Flow on Properties of High-speed Laser Cladding Iron-based Cladded Layer on Aluminum Alloy Surface

作　　者：赵子豪 殷咸青[1] 李成新[1] 杜开平 王轲岩 ZHAO Zihao;YIN Xianqing;LI Chengxin;DU Kaiping;WANG Keyan(School of Materials Science and Engineering,Xi'an Jiaotong University,Xi'an 710072,China;BGRIMM Technology Group,Beijing 100160,China)

机构地区：[1]西安交通大学材料科学与工程学院,陕西西安710072 [2]矿冶科技集团有限公司,北京100160

出　　处：《热加工工艺》2024年第22期15-19,共5页Hot Working Technology

基　　金：国家重点研发计划项目(2018YFB2002000)。

摘　　要：为了改善铝合金表面的耐摩擦磨损性能,研究采用高速激光熔覆工艺在ADC12压铸铝合金表面制备马氏体不锈钢耐磨熔覆层。研究了粉末流量对熔覆层表面粗糙度、厚度、硬度的影响,分析了熔覆层和基体交界区域的微观形貌,对比了马氏体熔覆层和ADC12铝合金、铸铁HT250的摩擦磨损性能。结果表明:粉末流量对熔覆层厚度和表面质量有较明显的影响,熔覆层和基体交界处并不完全为光滑形貌,存在回旋状不规则结构和微观孔隙。在本文的摩擦磨损试验条件下,马氏体不锈钢熔覆层体积损失仅为铝合金的23.1%,为铸铁HT250的60.0%。这说明马氏体不锈钢熔覆层在该条件下耐磨损性能明显优于基体ADC12铝合金,且优于对比的缸套材料铸铁HT250,有较好的耐摩擦磨损性。In order to improve the friction and wear resistance of the aluminum alloy surface,the high-speed laser cladding process was used to prepare the martensitic stainless steel wear-resistant cladded layer on the surface of ADC12 die-casting aluminum alloy.The effects of different powder flow rates on the surface roughness,thickness and hardness of the cladded layer were studied.The micro-morphology of the interface area between the cladded layer and the matrix was analyzed.The friction and wear properties of martensitic cladded layer,ADC12 aluminum alloy and cast iron HT250 were compared.The results show that the powder flow has a significant effect on the thickness and surface quality of the cladded layer.The junction between the cladded layer and the substrate is not completely smooth,and there are convoluted irregular structures and microscopic pores.Under the friction and wear test conditions described in the paper,the volume loss of martensitic stainless steel cladded layer is only 23.1%of that of aluminum alloy and 60.0%of that of cast iron HT250.It shows that the wear resistance of the martensitic stainless steel cladded layer is obviously better than that of the base ADC12 aluminum alloy under the condition,and it is better than the comparison cylinder liner material cast iron HT250,which has better friction and wear resistance.

关 键 词：高速激光熔覆 异种金属连接 表面改性 摩擦磨损 

分 类 号：TG174.4[金属学及工艺—金属表面处理]