gamma irons造句

• Steel contains a relatively small percentage of carbon, which can migrate freely within the gamma iron.
• When iron or steel cross the A 2 critical temperature, it begins to change into the allotrope called gamma iron.
• In steel, the carbon begins to mix with gamma iron at the A 3 temperature, forming a solid solution called austenite.
• At atmospheric pressure, there are three allotropic forms of iron : ferrite, gamma iron ( ? ) a . k . a . austenite, and delta iron ( ? ).