负压铸渗法制备铸铁表面Ni／WC复合渗层三点弯曲性能测试  

Three-Point Bending Behavior of Surface Composite Ni/WC on Cast Iron Substrate Produced By Vacuum Infiltration Casting

作　　者：王海棠[1] 李元东[1] 杨贵荣[1] 刘生龙 郝远[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室 [2]酒钢机械制造公司,嘉峪关735100

出　　处：《中国表面工程》2008年第4期22-26,35,共6页China Surface Engineering

基　　金：甘肃省中俄国际合作项目(4WS064-A72-053);中科院“西部之光”项目;中科院“科技支甘”项目

摘　　要：采用负压铸渗法制备了铸铁表面不同WC含量的Ni基复合渗层,观察了渗层与基体结合形貌并对试样进行三点弯曲测试。结果表明:渗层与基体熔合良好;随着渗层中WC含量的增加,渗层的韧性变差,变形的能力变差;弯曲破坏形貌和断口分析表明,不同WC含量的渗层破坏形貌基本相同,断裂机理也相同,基体沿石墨断裂,渗层沿WC断裂。The composite layers with different content of WC infiltrated on Ni-based surface were fabricated on cast iron substrate through vacuum infiltration casting technology. The appearance of combining layer had been observed and three-point bending test was performed. The result shows that, the bonding between substrate and layer is excellent; With the increasing of content of WC in the infiltrated layer, the toughness of the surface infiltrated layer decreases, the ability of deformation becomes poor. The analysis of destruction pattern and fracture shows that, the fracture appearance of surface infiltrated layer for various content of WC was identical, and their fracture mechanics seem similar, the substrates break apart along graphite, the layers break apart along WC.

关 键 词：渗层 三点弯曲 断口形貌 

分 类 号：TB331[一般工业技术—材料科学与工程]