i think i understand what you mean, soften the edges of the hammer, make it a bit spherical. And make sure that you don't overheat the steel, otherwise it changes to cementite.
btw, does someone know an answer to the following question?
when i'm more experienced, i want to start forgewelding damascus steel for making knives. But next week i'll probably start building a forge, but what fuel is best for damascus? Charcoal, coal or gas?