磁场淬火处理对硬质合金组织和性能的影响  

Effect of magnetic quenching on performance and structure of cemented carbides

作　　者：李荐[1,2] 郭欣[1] 姚建军 周宏明[1] 杨俊[1] 江彬彬[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]中南大学粉末冶金国家重点实验室,湖南长沙410083 [3]南通江海电容器股份有限公司,江苏南通226361

出　　处：《中南大学学报（自然科学版）》2012年第7期2513-2519,共7页Journal of Central South University:Science and Technology

基　　金：国家科技支撑计划项目(2009BAE71B04);粉末冶金国家重点实验室开放课题资助项目(2008112006)

摘　　要：采用X线衍射（XRD）、扫描电镜（SEM）、金相（OM）、横向断裂强度、维氏硬度以及矫顽磁力测试等分析手段,研究YG6（WC-6%Co）及YN6（WC-6%Ni）合金在磁场淬火处理后的性能变化规律。研究的条件为：样品在（1 100±5）℃下保温20~25 min,在脉冲磁场强度2 T下淬火15 min后再（500±5）℃回火3 h;此外对YG6合金进行常规淬火比较。研究结果表明：磁场淬火可使YG6合金维氏硬度提高3%、横向断裂强度提高18%、冲击韧性提高24%、矫顽磁力提高25%;而YN6合金横向断裂强度提高5.9%,冲击韧性提高6.9%,维氏硬度和矫顽磁力无明显变化。磁场淬火使钴基硬质合金的黏结相中α-Co含量提高,W和C在黏结相中的固溶度增加,WC晶粒棱角趋于圆滑;同时,磁场引起钴基硬质合金中WC晶粒出现锯齿状形貌并偏转为有序方向排列,是合金性能改善的主要原因。The effects of magnetic quenching on the performance and structure of YG6 （WC-6%Co） and YN6 （WC-6%Ni） cemented carbides were studied using powder X-ray diffraction, scanning electron microscope, optical microscope, transverse rupture strength, Vickers hardness and coervice force tests. The research conditions are： samples are held at （1 100q-5） ℃ for 20-25 rain, magnetic quenched for 15 min with 2 T intensity, then annealed at temperature （500＋5） ℃ for 3 h. Conventional quenching treatment with YG6 （WC-6%Co） was also conducted. The results show that after magnetic quenching, Vickers hardness of YG6 increases by 3%, transverse rupture strength increases by 18%, impact toughness increases by 24%, coervice force increases by 25%; while transverse rupture strength of YN6 increases by 5.9%, impact toughness increases by 6.9%, and there is no significant change in Vickers hardness and coervice force of YN6. The content of a-Co in WC-Co alloy increases, solid solubility of W and C increases and the degree of the rounding of the edges and comers of carbide crystals tends to increase after magnetic quenching; and WC presenting serration feature while deflecting to ordered direction is the main reason for performance improving.

关 键 词：硬质合金 磁场淬火 回火 磁化形变 

分 类 号：TG135.5[一般工业技术—材料科学与工程]