摘要
以金相、透射电镜,电子衍射、X射线衍射及微区成分分析等综合方法研究了4Cr5MoVSi钢渗氮层中氮化物的类型、分布、形貌及微区成分沿渗层的变化规律。结果表明,化合物层的ε、γ基体上弥散析出CrN、Mo_2N和VN合金氮化物。扩散层内弥散析出的合金氮化物多分布在碳化物较多的原马氏体界面及碳化物与α的边界上。脉状组织形成的原因是合金元素和氮原子在原奥氏体晶界偏聚形成合金氮化物。控制渗氮工艺可减轻脉状组织为细小的颗粒状。由于大量氮原子溶入合金化的α相,使α晶胞膨胀晶面间距增大。
The morphology,microstructure.composition and distribution in nitrided layer of 4Cr5MoVSi steel has been examined by OM,TEM,XRD and EPMA. The investigation shows that there are dispersed CrN,Mo2N and VN within e and γ' -matrix on chemical compound layer,and the alloynitrides on diffusion layer is distributed along the o-riginal martensite boundary and carbide/a phase. Since the alloy element and nitric atom segregate on the austenite crystal boundary,the vein-like structure is formed. The a-phase unit cell is expanded and the space of crystal face is increased, because a lot of nitric atoms dissolve in alloying o-phase.
出处
《理化检验（物理分册）》
CAS
1994年第2期15-18,57,共5页
Physical Testing and Chemical Analysis(Part A:Physical Testing)
关键词
渗氮层
氮化物
模具钢
组织结构
4Cr5MoVSi steel Nitrided layer Chemical compound layer Diffusion layer
