电冶熔铸WC/钢复合材料中WC的溶解行为

用电冶熔铸工艺制备不同WC含量的WC/钢复合材料,研究了WC颗粒在复合材料钢基体中的溶解行为和影响因素.结果表明:随着WC含量的增加,碳化物从钢基体晶界处分布逐渐转向晶内分布;随着WC颗粒尺寸的增大,在WC颗粒与钢基体界面处形成一层反应物,它阻止了WC颗粒在钢基体中的进一步溶解,同时也提高了两相界面的结合强度.通过调整电冶熔铸工艺参数和WC颗粒的尺寸及含量,可以控制WC颗粒在复合材料中的溶解行为.

Dissolution behavior of WC particle in WC steel matrix composites by electroslag melting and casting method

The WC/steel composites with various contents of WC were prepared by means of electroslag melting and casting method. The dissolution behavior of WC particle and its effect factors in the composites were researched. A variety of experiment techniques were used to investigate the interactions between tungsten carbide particle and the steel matrix. The results show that the distribution of WC particles varies from intergranular position of the steel matrix to interagranular location with increasing contents of WC particle. Furthermore, the interracial reaction layer is formed on the vicinity of WC particle owing to the increase of size of WC particle, which prevents the interdiffusion of elements between matrix and WC particle and enhances drastically the interface bonding intensity. The dissolution behavior of WC particle in the composites can be controlled by regulating the processing parameters of elecctroslag melting and casting method and adjusting the powder starting size and contents of WC particle.