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Additively manufactured nitrogen-atomized 17-4 PH stainless steel with mechanical properties comparable to wrought

Published

Author(s)

Eric Lass, Mark R. Stoudt, Maureen E. Williams

Abstract

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.
Citation
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume
50A
Issue
4

Keywords

additive manufacturing, 17-4 stainless steel, martensite, retained austenite
Created February 4, 2019, Updated September 25, 2019