Will my K-1 fiancee visa automatically change to a Green Card (permanent resident card)?
No. After the marriage takes place, your U.S. citizen wife or husband must contact U.S. Citizenship and Immigration Services to change your status to legal permanent resident in order to obtain a Green Card. This information is given to you when you enter the U.S. For more information, see Fiance Visa – US Fiancee Visa USA (K-1 Visa).