I just started watching the anime and I haven't read much of the manga so I don't know if it is explained further on.
We all know a Titan's body gives off extreme heat, from an encounter Eren had with the Colossal Titan and an episode where they learned this in class.
In episode 6, when Mikasa killed a Titan, we saw the body still giving off heat..
..and a few minutes later it was pretty badly burnt, unrecognizable in fact.
Later in episode 7 when Eren in his Titan form attacks another and beats it to a pulp, we see that the process has somewhat accelerated? At first I thought the body eventually burned away but this one was different than the first. All of the Titan's flesh was gone.
So, what exactly happens to a Titan's body structure after it is killed? Does the heat burn it up now that it cannot regenerate or what?