Effects of electroslag remelting on as-cast microstructure and mechanical properties of Cr20Ni80 ingot were investigated by analyzing comparatively cross section’s macrostructure

inclusions

mechanical properties of ingots before and after ESR.The results reveal that the range of columnar crystal zone in big end

and small end as well as fine grain zone at small end is extended after ESR.The columnar crystal zone is one half of the radius in the big end and the crystal grain exhibits a certain degree of roundness in the small end after ESR.SEM analysis shows that there exist 5types of inclusions in the ingot and absence of new inclusion after ESR.By analyzing the amount and size of inclusions in the ingot before remelting

it is found that the main mechanism for inclusion segregation in the bottom of the ingot is the capturing of large inclusions by showering crystallites during floatation.Area ratio of inclusions in the ingot is decreased by 48.3% with more uniform distribution of inclusion

where plasticity is improved bu 8

9

times

and toughness is increased by 5

6

times after ESR.