Study of High Co Superhard High Speed Steel Surface

摘要：

Cobalt- superhard high speed steel layer has been formed on the surface of low alloy steel 20Cr2V by tungsten-molybdenum-cobalt plasma surface alloying and following plasma carbonizing. After plasma surface alloying, a homogeneous and dense surface alloying layer was formed, thickness of which is 200μm. Composition, microstructure and properties of the alloying layer were investigated. Contents of W, Mo, Co, Cr, V and C in the surface layer reach 8％,5％, 6％ ,4％,1.5％ and 1.5％ or so respectively. The concentrations of alloy elements basically meet the requirements of high cobalt type superhard high speed steel. Constituent phases of the surface layer were martensite, M7C3 ,M2C and Cr3C2 carbides and μ phase after quenching treatment. The advanced gradient superhard high speed steel possesses not only high surface hardness, high anti-temper softening ability but also enough toughness.

关键词： plasma surface alloying superhard high speed steel structure and property

作者: Zhonghou LI Shasha LIU Zhiyong CHEN

作者单位: Research Institute of Surface Engineering,Taiyuan University of Technology,Taiyuan 030024,China Research Institute of Surface Engineering,Taiyuan University of Technology, Taiyuan 030024,China

会议类型: 国际会议

会议名称: 2008年中美材料国际研讨会

会议地点: 重庆

会议语种:英文

页码: 253-256

在线出版日期: 2008-06-09（万方平台首次上网日期，不代表论文的发表时间）