If you have a welder (arc or mig) you can run 3 short beads across the race's inside diameter and after they cool,the race shrinks enough to let you remove it easily..you can cut a slot in it with a torch too,the hard bearing race will melt faster than the axle housing,but you'll risk getting some slag in the tubes,if I use a torch I put the tip on the inside and blow the sparks out if possible..or stuff a wet rag in the axle tube..
One guy I know had the same problem as you,he used a can of A/C freon to "freeze" the race,and it shrunk it enough to allow his slide hammer to get it out..
You can use a chisel to crack the race too,but be ready for shards to come flying out,wear goggles and gloves if you try that...