The 21-year-old Dahlbeck, a 2011 third-round pick, had one goal, five assists and a plus-11 rating in 70 games for the IceHogs this season. He has not played in the NHL.
The 22-year-old Olsen, a 2009 first-round pick, had two goals and nine assists in 50 games with the IceHogs this season. He has played in 28 regular-season games and one playoff game for the Blackhawks in his career.
The Blackhawks recalled nine other players from the IceHogs on Friday.