Do divorces occur in the two aforementioned cases, and what is the ruling on an oath made with the intention of تهديد (threatening), and what are its consequences?

No divorce has occurred with your wife. The first oath pertains only to her leaving the room, because intention specifies the general. The second oath is merely a promise and a threat of divorce, by which no divorce occurs upon breaking it. One should avoid threatening with divorce and be diligent in using legitimate means for reconciliation.