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

Published

February 4, 2019

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

Pub Type

Journals

Download Paper

DOI Link

Keywords

additive manufacturing, 17-4 stainless steel, martensite, retained austenite

Citation

Lass, E. , Stoudt, M. and Williams, M. (2019), Additively manufactured nitrogen-atomized 17-4 PH stainless steel with mechanical properties comparable to wrought, Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, [online], https://doi.org/10.1007/s11661-019-05124-0 (Accessed April 19, 2024)