Metallurgy Question: Download Questions PDF
Is it possible to determine the heat treatment condition in Stainless Steel (ASTM A 479 Gr XM-19) by checking the microstructure?
Answer:
Clearly, you have some specific alloy issues possibly relating to an engineering or design problem you are working on. It appears to me then you are seeking some free consultation. I will cover some basics but you need to be talking to a local metallurgical engineer who can help with the specifics of your problem.
First, you mention two different alloys A-479 is a type 405 ferritic alloy, 11.5 - 14.5 Cr, 0.8 C, and no nickel. This single-phase BCC alloy is not heat treatable. The XM-19 alloy is a type 209 austenitic stainless steel, sometimes called Nitronic 50, 20.5 - 23.5 Cr, 0.6 C, 4 - 6 Mn, 11.5 - 13.5 Ni, plus all kinds of minor alloying elements. This stable, single-phase FCC alloy is also not heat treatable but gets its strengthening from cold work.
First, you mention two different alloys A-479 is a type 405 ferritic alloy, 11.5 - 14.5 Cr, 0.8 C, and no nickel. This single-phase BCC alloy is not heat treatable. The XM-19 alloy is a type 209 austenitic stainless steel, sometimes called Nitronic 50, 20.5 - 23.5 Cr, 0.6 C, 4 - 6 Mn, 11.5 - 13.5 Ni, plus all kinds of minor alloying elements. This stable, single-phase FCC alloy is also not heat treatable but gets its strengthening from cold work.
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