TK does not have a codeshare agreement with AS. Your ticket is just an interline ticket - therefore, no TK miles or lounge. The default baggage allowance applies all the way through IST-SEA - TK will grant +1 bag based on your elite status, but AS will not.

Any reason you are doing this connection rather than flying the TK IST-SEA nonstop? Changing terminals from the international terminal to domestic terminal in ORD is highly inconvenient, to put it lightly.

If you want miles and/or the extra bag allowance, you'll want a TK ticket that includes UA segments within the US, rather than AS.