Microstructure and tensile properties of oxide strengthened ferritic steel fabricated using as-milled powders with dissolved oxygen

Huang, Liqing, Liu, Zuming, Guo, Wei, Chen, Shiqi, Duan, Qinglong, Zhou, Canxu and Soo, Mun Teng (2015) Microstructure and tensile properties of oxide strengthened ferritic steel fabricated using as-milled powders with dissolved oxygen. Fusion Engineering and Design, 95 1-6. doi:10.1016/j.fusengdes.2015.02.042


Author Huang, Liqing
Liu, Zuming
Guo, Wei
Chen, Shiqi
Duan, Qinglong
Zhou, Canxu
Soo, Mun Teng
Title Microstructure and tensile properties of oxide strengthened ferritic steel fabricated using as-milled powders with dissolved oxygen
Journal name Fusion Engineering and Design   Check publisher's open access policy
ISSN 0920-3796
1873-7196
Publication date 2015
Sub-type Article (original research)
DOI 10.1016/j.fusengdes.2015.02.042
Open Access Status Not yet assessed
Volume 95
Start page 1
End page 6
Total pages 6
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2016
Language eng
Formatted abstract
Pre-alloyed ferritic powders were milled for 10 h in the air atmosphere to introduce O atoms into the steel matrix. Then the milled powders which contained dissolved O were used to fabricate ferritic steels by hot processing. The precipitation of oxide, microstructural evolution and tensile properties of ferritic steels were studied. Results show that about 1.4 wt.% of oxygen was introduced into powders, and the powder surface has a higher O content (about 2–4 wt.%) than the inner region (about 1 wt.%). During hot processing Cr2O3 and Y2TiO5 were precipitated as the main second-phases. Surface regions of powders in which Cr2O3 largely precipitated were elongated, cracked then gathered, and dispersed in the steel matrix along the hot working direction. Tensile results show that the ultimate tensile strength of as-prepared steel in room temperature was 1601 MPa and was still high (1335 MPa) at 550 °C. The excellent tensile strength under 550 °C can be ascribed to the reinforcement of high content of oxide particles in the matrix. The tensile strength suffered a great reduction at temperatures between 550 °C and 650 °C, but it decreased slower at higher tensile temperatures.
Keyword Air atmosphere
Ferritic steels
Microstructural separation
Oxide strengthened
Ultimate tensile strength
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2016 Collection
 
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