Journal
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
Volume 23, Issue 12, Pages 4421-4428Publisher
SPRINGER
DOI: 10.1007/s11665-014-1226-y
Keywords
austenite-to-martensite phase transformation; microstructure formation; selective laser melting
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Funding
- Office of Naval Research [N00014-09-1-0147, N00014-10-1-0800]
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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 A mu m) 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.
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