Development of a novel melt spinning-based processing route for oxide dispersion-strengthened steels

Journal article

Melt spinning of an Fe-5Y and Fe-1Y-1Ti (wt pct) alloy produced a relatively uniform spatial distribution of Y and Ti in solid solution and ribbons with consistent yield (> 60 pct by weight), fast processing time (< 10 seconds), good scalability (up to > 100 g feedstock material), and repeatability. Heat treatment in the presence of Fe₂O₃ as an oxygen source (Rhines pack method) at 973 K validated the potential of forming < 20 nm Y-rich oxides in the Fe-5Y ribbons. Pulverized Fe-1Y-1Y ribbons were consolidated to bulk using the field-assisted sintering technique (FAST) incorporating nano-sized Fe₃O₄ powder as the oxygen source. After FAST at 1273 K, 50 MPa, and 30 minutes, a comparatively high number density of sub-micron Y and/or Ti-rich oxides were developed. Further formation of fine-scale oxides took place during post-FAST annealing, resulting in an approximate 20 pct increase in hardness at temperatures below 573 K, but with a reduced hardening effect above 673 K due to a small fraction of persistent porosity and mechanically weak prior ribbon boundaries that were decorated with Ti-rich oxides.

Authors: Hong, Z; Morrison, A; Zhang, H; Roberts, SG; Grant, PS

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Springer Verlag
• Journal: Metallurgical and Materials Transactions A
• Volume: 49
• Issue: 2
• Pages: 604–612
• Publication date: 2017-12-04
• Acceptance date: 2017-10-23
• DOI: 10.1007/s11661-017-4398-x
• EISSN: 1543-1940
• ISSN: 1073-5623
• Keywords: oxide dispersion strengthened steel; field assisted sintering; melt spinning; internal oxidation