Abstract: The solidification process and structure of high alloy steel Vanadis4(V4)- 1.5C, 8.0Cr, 1.5Mo, 4.0V have been investigated by laser scanning confocal microscope,X-ray difraction,SEM,electron probe micro analyzer,en- ergy dispersive X-ray spectrometer and differential scanning calorimetry. Results showed that the matrix of steel V4 consis- ted of martensite and retained austenite with main carbides MC and M₇C₃.The Carbide VC with shape of pole,stick and block was distributed at grain boundary.The crystallization process L→γ first occurred during solidification of the steel to precipitate primary γ phase,with increasing γ phase the alloy elements continuously were enriched in remained liquid,with liquid reaching eutectic,composition,the eutectic reactions,CL→γ+MC and L→γ+M₇C₃ ocncfuorcrld in seoqsuccee.

Key words: steel Vanadis4, structure, solidification process, laser scanning confocal microscope

摘要： 通过激光扫描共焦显微镜、X射线衍射、扫描电镜、电子探针、微区成分能谱分析和差示扫描量热法,研究了高合金Vanadis4(V4)模具钢(%:1.5C、8.0Cr、1.5Mo、4.0V)的凝固过程及其微观组织。结果表明,V4钢基体为马氏体和残余奥氏体,基体中碳化物主要为MC与M₇C₃型。杆状、棒状或团块状VC分布在晶界。该钢在凝固时,首先发生结晶过程L→γ从液相中析出初生γ相,随着γ相不断析出,剩余液相中合金元素含量不断富集,达到共晶成分后将先后发生L→γ+MC与L→γ+M₇C₃共晶反应。

关键词: Vanadis4钢, 组织, 凝固过程, 激光扫描共焦显微镜,