摘要
应用扫描电镜(SEM)、微区成份分析(EDS)和X射线衍射研究了H13钢经离子渗氮后不同温度盐浴渗铬所得复合渗铬层的显微组织及其形成机制,并从热力学上探讨复合盐浴渗铬的可行性。H13钢复合渗铬化合物层为高铬化合物层,其相结构主要为CrN、(Cr,Fe)2N1-x和α-(Cr,Fe)组成;随渗铬温度的升高,复合渗铬试样表面上CrN和α相含量降低,而(Cr,Fe)2N1-x含量却增加并出现(Cr,Fe)2N1-x(0002)晶面择优取向,同时化合物层中出现氮浓度外低内高的层状结构。
The microstructure and formation mechanism of the composite ion-nitrided plus chromized layers obtained at various salt-bath chromizing temperatures for H13 tool steel were investigated using scanning electron microscopy and X-ray diffraction. The thermodynamic equilibrium of the composite salt bath chromizing was discussed. It is found that the composite chromized layer on H13 tool steel is a Cr-rich compound layer, consisting of CrN, (Cr, Fe)2N1-x and α-(Cr, Fe). When temperature of chromizing increasing, the content of CrN and α-phase in the surface decreases while the content of (Cr, Fe)2N1-x increases and the texture of (Cr, Fe)2N1-x (0002) crystal plane become intensity. There appears sublayers contained different content of nitrogen in the compound layer, and the content of nitrogen increases along the depth of the layer.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2007年第3期93-97,共5页
Transactions of Materials and Heat Treatment
基金
教育部博士点基金(No.20030561001)
湖南省博士后基金(2006FJ4238)
关键词
H13钢
复合渗铬
氮化铬
热力学
Microstructure
Scanning electron microscopy
Thermodynamics
X ray diffraction analysis
