铸钢表面钒铬铸渗层组织及干滑动磨损性能研究

Study on Microstructure and Dry Sliding Wear Property of Casting Penetration Composite Layer with Vanadium and Chromium on the surface of Cast Steel

采用消失模铸渗工艺在ZG310-570表面制备了钒铬表面复合层,并考察了其显微组织、显微硬度以及干滑动磨损性能。结果表明,钒碳化物为球状和条状,铬碳化物为块状和板条状。铸渗复合层的硬度沿渗层表面到基体方向先增加后降低,在距表面1.5-2.0 mm处达到最大值。在30-90 kg载荷下,复合材料的磨损失重随着载荷的增加而增加,含V-Fe15%、Cr-Fe60%的渗剂做成的块试样耐磨性最好。复合层的磨损机制主要为磨粒磨损,ZG310-570的磨损机制为塑性变形和剥落。

Casting penetration composite layer with vanadium and chromium on the surface of ZG310-570 was formed by V-EPC casting penetration technology. The microstructure, microhardness and property to resist dry sliding wear of the composite layer were studied. The results show that, typical morphologies of vanadium carbide appears in the shape of sphericity and strip, and chromium carbide appears lump and lath. The microhardness of the composite layer rise first and decrease later from surface to inside and reach the maximum within the range of 1.5 to 2.0 millimeters from surface. Under the loads of 30 to 90 kilograms, the weight loss of composite layers increase with the increase of load, the sample with 40% V-Fe and 35% Cr-Fe has high ability to resist dry sliding wear. The wear mechanism of the composite layers is mainly abrasive wear, and the wear mechanism of ZG310-570 is plastic deformation and spalling.