Ironman and Superman didn't have any crossover encounters in the original comics. Their universes and story arcs were distinct, and there were no official meetings.
No, they never met in the original comics. Their storylines were separate.
No, Ironman has never become Dr Doom in the comics.
Yes, Ironman has died in some comic storylines.
It varies depending on the comic series. Sometimes it's through a mutual enemy's plot that brings them face to face and makes them realize they need to team up.
Yes, they have fought many times in the comics. It's a classic showdown between two of DC's biggest heroes.
Yes, Superman did fly in the original comics. It was one of his signature abilities.
Yes, he did. His death was a significant event in the comic storyline.
No, Superman has conventionally been shown as a white character in the comic universe. There haven't been any significant storylines where he was portrayed as black.
Well, Ironman's death in the comics was a heroic act. He made a huge sacrifice to protect the world. His suit couldn't handle the immense power needed to stop the threat, and it ultimately cost him his life.
Ironman sacrificed himself to save the universe by using the Infinity Stones, which took a huge toll on his body and led to his death.