摘要
利用等离子表面合金化技术 ,在碳钢表面进行W、Mo、C共渗 ,共渗合金层中W当量质量分数超过 10 % ,含碳量超过平衡碳计算值 ,碳饱和度达 1 6以上 ,约是一般冶金高速钢碳饱和度的两倍。用X射线衍射分析了共渗合金层中碳化物的结构类型 ;用电子探针进行微区成分分析 ,测定碳化物的成分 ,并计算了碳化物中碳原子与合金元素之间的原子比。结果表明 ,共渗合金层中的碳化物主要是由合金元素W、Mo和C形成的M6 C型碳化物及少量的M2 C型碳化物。M6 C型碳化物中碳原子与合金元素之间的原子比为 1 6～ 3 2∶1平均为 2 4。与一般冶金低合金高速钢中的合金元素与碳原子比相比较 ,范围窄 ,且偏低。
The carbides in plasma surface alloying layer of 20 steel were studied by XRD and EPMA. The results show that the W content is higher than 10% (mass fraction) and the carbon content exceeds the calculated balance carbon value and the saturability of carbon reaches 1.6 in the alloying layer for W-Mo-C multi-element alloying on carbon steel. The structure and type of the carbide are analyzed by X-ray diffraction and the carbide composition is determined with EPMA. The atom ratios of carbon to W, Mo are calculated. The carbides in plasma surface alloying layer are mostly M6C and M2C. The atom ratios of carbon to alloy elements in M6C are 1.6-3.2:1 and the average value is 2.4. This ratio is lower than that of conventional high speed steel.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2004年第3期78-80,84,共4页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金资助项目 (50 3740 54)
关键词
高速钢
等离子
碳化物
合金化
Alloying
Carbides
Carbon steel
Microstructure
Plasma applications
