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M_7C_3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+M_7C_3共晶反应。
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 diffraction, SEM, electron probe micro analyzer, energy dispersive X-ray spectrometer and differential scanning calorimetry. Results showed that the matrix of steel V4 consisted of martensite and retained austenite with main carbides MC and M7 C3. 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 γphase, with increasing γphase the alloy elements continuously were enriched in remained liquid, with liquid reaching eutectic composition, the eutectic reactions L→γ＋ MC and L→γ＋ M7 C3 occurred in sequence. Material Index Steel Vanadis4, Structure, Solidification Process, Laser Scanning Confocal Microscope
出处
《特殊钢》
北大核心
2008年第1期4-6,共3页
Special Steel
基金
上海宝钢集团“十五”重大项目资助(BG010102)
