Try looking under "Trade skills - by trade" in the column to the left. When you click on "Blacksmithing", then on "recipe list", you will find a group of recipes listed for Master Armorsmiths, with the availability of each. Just glancing over the list, it looks like many of them are from quests (the Thorium group), some from the Dark Iron trainer, and most require even higher levels of blacksmithing skill.