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 M

7

C

3

.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+M

7

C

3

ocncfuorcrld in seoqsuccee.