Yes they can. Do not use heat! Use a vertical press and a set of V blocks. Using a dial indicator find the high spot and press down in between the 2 blocks. A little at a time. Repeat this procedure until you have eliminated any run out. A machine shop can do this for you if you don't have the tools.
Are these axles forgings, similar to Ford I beams? I began cleaning up the axle with a flap wheel today, it seems to grind rather slowly compared to mild steel which leads me to believe they are of a substantial nickel content.
Where Are You From? Normal IL
Do You own a car built by Durant? Just parts really