扫描间距对45钢激光熔凝强化组织性能的影响

Influence of scanning interval on microstructure and abrasive wear resistance of 45 Steel by laser melting

为了研究扫描间距对45钢激光熔凝强化组织性能的影响,采用HLD1001-5型固体激光器对45钢表面进行了多条带等间距激光熔凝处理,分别利用扫描电镜、洛氏硬度计、磨损试验机观察和测量了不同扫描间距下硬化层的显微组织及性能。结果表明:激光熔凝处理的硬化层由熔化区、相变硬化区和热影响区组成,组织为马氏体;多条带等间距激光熔凝处理在垂直于熔凝条带方向上的硬度分布由左高硬度区、左过渡区、低硬度区、右过渡区和右高硬度区组成,高硬度区的硬度为58.1～59.6 HRC,低硬度区的硬度约16 HRC;在试验范围内,经激光扫描间距为4.5 mm熔凝处理的试样具有最好的耐磨性。

A variety of the multi-stripe and equal-interval laser melting treatments on the surface of 45 Steel samples were obtained using HLD1001.5 solid-state laser for studying the influence of scanning interval on the microstructure and abrasive wear resistance of 45 Steel by laser melting.The microstructure and properties of the samples were studied by SEM,Rockwell hardness tester and wear tester.The results showed that the hardened layer by laser melting was composed of melted zone,phase transformation zone and heat affected zone.The hardened layer was a martensite microstructure.The Rockwell hardness distribution was composed of left high value zone,left transitional zone,low value zone,right transitional hardness zone and right high value zone.The hardness at high value zone and low value zone was 58.1–59.6 HRC and 16 HRC respectively.Under the conditions of the experiment,the samples with the treatment of 4.5 mm scanning interval featured the best abrasive wear resistance.