Additively manufactured nitrogen-atomized 17-4 PH stainless steel with mechanical properties comparable to wrought
Eric Lass, Mark R. Stoudt, Maureen E. Williams
The microstructure of the additively manufactured (AM) nitrogen-atomized 17-4 contains 12±2 % retained austenite after conventional 17-4 post-build thermal processing, compared wrought which contains ≈100 % BCC/martensite, resulting a yield strength half that of wrought. By solutionizing at 1273 K (1000 °C) instead of 1323 K (1050 °C), more nitrogen is trapped as M(C,N)-carbides, and upon further cooling to 233 K (-40 °C) the AM17-4 microstructure contains ≈95 %. This alternative solutionization recovers the yield strength of the AM material to >90 % of its wrought counterpart, a critical first step the implementation of AM17-4 in real-world applications.
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science