铸钢表面消失模铸渗层干滑动磨损行为研究

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和干滑动磨损性能.结果表明,所制备的复合层组织致密、无铸造缺陷.在铸渗复合层中存在着几种典型的碳化物形态：条块状、菊花状、短杆状以及团球状.在300～750 N载荷下,铸渗层的磨损量随载荷的增加而增加,当铸渗剂中铬铁、钒铁的质量分数分别为35%、40%时铸渗层的耐磨性能最好,在450 N载荷下是ZG310-570的16.5倍.铸渗层的磨损机理为磨粒磨损及塑性变形和剥落.

Dry Sliding Wear Property of V-EPC Cast-infiltration Composite Layer on the Surface of Cast Steel

The microstructure and dry sliding wear behavior of V-Cr composites layer on the surface of ZG310-570 cast steel prepared by V-EPC cast-infiltration method have been investigated.The result indicates that the prepared composite layer possesses compact microstructure and absence of defects in the composites layer is found.There exists typical carbide morphology in composites layer,such as strip and bar,chrysanthemum,short bar and spheroids.The weight loss of the composites layer is increased with raising loading in the range of 300~750N.The desirable wear resistance of the composites layer can be observed with cast-infiltration agent containing 35% Cr-Fe and 40% V-Fe,which is 16.5 times of that of ZG310-570 cast steel.The wear mechanism of the cast-infiltration layer exhibits abrasive wear,plastic deformation and delamination.