Details

Autor(en) / Beteiligte

• Hsu, Tzu-Hou
• Chang, Yao-Jen
• Huang, Cheng-Yao
• Yen, Hung-Wei
• Chen, Chih-Peng
• Jen, Kuo-Kuang
• Yeh, An-Chou

Titel

Microstructure and property of a selective laser melting process induced oxide dispersion strengthened 17-4 PH stainless steel

Ist Teil von

• Journal of alloys and compounds, 2019-09, Vol.803, p.30-41

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Selective laser melting (SLM) process of 17-4 PH stainless steel has been a subject of research interest due to its complex microstructure-property correlation associated with SLM process. In this work, an oxide dispersion strengthened 17-4 PH stainless steel was successfully fabricated directly by SLM process with an oxygen content of 500 ppm in the chamber. It contained a matrix of ultrafine packet of martensite and reverted austenite with a dispersion of nano Mn-Si oxide particles that could provide strengthening by generation of geometrically necessary dislocations, making 17-4 PH an oxide dispersion strengthened material after the SLM process. Furthermore, post heat treatments could increase fractions of martensite and further induce either formation of ultrafine reverted austenite to promote significant transformation-induced plasticity during work hardening process or Cu-rich phase precipitation strengthening. This article not only describes a clear microstructure-property correlation for a SLM processed 17-4 PH, but also it shows the potential advantage of the SLM process in microstructure engineering. [Display omitted] •An oxide dispersion strengthened 17-4 PH was fabricated by SLM.•As-SLM microstructure consisted of a matrix of fine martensite with nano oxide.•Post ageing could promote ultrafine reverted austenite resulting TRIP effect.•Geometrically necessary dislocations were observed around nano oxides.•Mn-Si nano oxides were stable after post heat treatment processes.