摘要
用回收的废WC Co硬质合金作原料,采用电冶熔铸法制备了新型的WC/钢基复合材料。借助金相分析、扫描电镜及X射线衍射等方法研究了该材料铸造原始态和退火态的微观组织结构,还测试了主要力学性能。材料中的硬质相和钢基体相的相互溶解,使两相实现了冶金结合,形成含W和Co的碳化物,但形态不佳。增加电磁搅拌可使枝晶"破碎";经退火处理和锻造可以改善材料中的不良组织,使硬质相碳化物粒子均匀地分布在钢基体中,冲击韧度也得到提高。
A new kind of WC/steel matrix composites was prepared by electroslag melting and casting and by utilizing waste WC-Co cemented carbides as raw material. As-cast and as-annealed and as-forged microstructures of this material were studied by means of opical microscopy and SEM and X-ray diffraction anlysis, and main mechanical properties were measured. The results show that hard phases and steel matrix phase in the material can solute each other and it results in these phases metallurgical combine and forming carbides which contain W and Co but have improper shape. The electromagnetic stirring has the action of cracking dendrites; annealing and forging help improve the improper structures, and It results in hard phases carbides particles distributing uniformly in steel matrix and impact toughness increasing.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2003年第z1期133-136,共4页
Journal of the Chinese Society of Rare Earths
基金
安徽省教育厅自然科学基金资助
重点项目(2003KJ016ZB)
关键词
WC-CO硬质合金
WC/钢基复合材料
电冶熔铸
组织结构
力学性能
WC-Co cemented carbide
WC/steel matrix composites
electroslag melting and casting
microstructure
mechanical properties