球铁激光表面重熔组织热处理制备新型铁基耐磨材料

HEAT TREATING LASER MELTED/RAPIDLY SOLIDIFIED DUCTILE IRON FOR NOVEL TRIBOLOGICAL MATERIALS

对球墨铸铁激光表面重熔／快速凝固组织进行热处理，使亚稳相快速凝固共晶渗碳体部分转变为石墨，成功地制得了既含快速凝固共晶渗碳体又含弥散石墨的新型多相铁基耐磨材料其中渗碳体及石墨相的体积分数可以通过调节退火时间严格控制由于集中了快速凝固共晶渗碳体的优异耐磨性与弥散石墨相的优异自润滑、传热及减振性能。

Novel tribological iron-base materials containing both as-rapidly solidified eutectic cementite and fine graphite nodules were successfully fabricated by partial graphitization of cementite through heat treating laser melted/rapidly solidified ductile cast iron. The volume fraction of the rapidly solidified cementite and the fine graphite nodules, and hence the tribological properties of the novel materials fabricated can be easily controlled by controlling the progress of the cementite-graphite phase transformation through simply adjusting the anneal time. The materials which have the unique property combination of excellent wear resistance of the rapidly solidified eutectic cementite phase and outStanding self-lubrication, heat conduction and damping properties of the graphite phase are expected to have excellent peformance under dry and/or boundary lubrication tribological conditions.