Microstructure and mechanical behavior of 17-4 precipitation hardenable steel processed by selective laser melting
Rafi, H. Khalid
Starr, Thomas L.
Stucker, Brent E.
Date of Issue2014
School of Mechanical and Aerospace Engineering
The mechanical behavior and the microstructural evolution of 17-4 precipitation hardenable (PH) stainless steel processed using selective laser melting have been studied. Test coupons were produced from 17-4 PH stainless steel powder in argon and nitrogen atmospheres. Characterization studies were carried out using mechanical testing, optical microscopy, scanning electron microscopy, and x-ray diffraction. The results show that post-process heat treatment is required to obtain typically desired tensile properties. Columnar grains of smaller diameters (<2 µm) emerged within the melt pool with a mixture of martensite and retained austenite phases. It was found that the phase content of the samples is greatly influenced by the powder chemistry, processing environment, and grain diameter.
DRNTU::Engineering::Mechanical engineering::Control engineering
Journal of materials engineering and performance
© 2014 ASM International. This paper was published in Journal of Materials Engineering and Performance and is made available as an electronic reprint (preprint) with permission of ASM International. The paper can be found at the following official DOI: [http://dx.doi.org/10.1007/s11665-014-1226-y]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.