The impact of retained austenite characteristics on the two-body abrasive wear behavior of ultrahigh strength bainitic steels

Narayanaswamy, Balaji, Hodgson, Peter, Timokhina, Ilana and Beladi, Hossein 2016, The impact of retained austenite characteristics on the two-body abrasive wear behavior of ultrahigh strength bainitic steels, Metallurgical and materials transactions A: physical metallurgy and materials science, vol. 47, no. 10, pp. 4883-4895, doi: 10.1007/s11661-016-3690-5.

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Title The impact of retained austenite characteristics on the two-body abrasive wear behavior of ultrahigh strength bainitic steels
Author(s) Narayanaswamy, Balaji
Hodgson, Peter
Timokhina, Ilana
Beladi, HosseinORCID iD for Beladi, Hossein orcid.org/0000-0003-0131-707X
Journal name Metallurgical and materials transactions A: physical metallurgy and materials science
Volume number 47
Issue number 10
Start page 4883
End page 4895
Total pages 13
Publisher Springer
Place of publication Berlin, Germany
Publication date 2016-10
ISSN 1073-5623
Keyword(s) Science & Technology
Technology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Materials Science
DIFFERENT MICROSTRUCTURES
C STEEL
RESISTANCE
TEMPERATURE
PROPERTY
FRACTURE
STRESS
DESIGN
Summary In the current study, a high-carbon, high-alloy steel (0.79 pct C, 1.5 pct Si, 1.98 pct Mn, 0.98 pct Cr, 0.24 pct Mo, 1.06 pct Al, and 1.58 pct Co in wt pct) was subjected to an isothermal bainitic transformation at a temperature range of 473 K to 623 K (200 °C to 350 °C), resulting in different fully bainitic microstructures consisting of bainitic ferrite and retained austenite. With a decrease in the transformation temperature, the microstructure was significantly refined from ~300 nm at 623 K (350 °C) to less than 60 nm at 473 K (200 °C), forming nanostructured bainitic microstructure. In addition, the morphology of retained austenite was progressively altered from film + blocky to an exclusive film morphology with a decrease in the temperature. This resulted in an enhanced wear resistance in nanobainitic microstructures formed at low transformation temperature, e.g., 473 K (200 °C). Meanwhile, it gradually deteriorated with an increase in the phase transformation temperature. This was mostly attributed to the retained austenite characteristics (i.e., thin film vs blocky), which significantly altered their mechanical stability. The presence of blocky retained austenite at high transformation temperature, e.g., 623 K (350 °C) resulted in an early onset of TRIPing phenomenon during abrasion. This led to the formation of coarse martensite with irregular morphology, which is more vulnerable to crack initiation and propagation than that of martensite formed from the thin film austenite, e.g., 473 K (200 °C). This resulted in a pronounced material loss for the fully bainitic microstructures transformed at high temperature, e.g., 623 K (350 °C), leading to distinct sub-surface layer and friction coefficient curve characteristics. A comparison of the abrasive behavior of the fully bainitic microstructure formed at 623 K (350 °C) and fully pearlitic microstructure demonstrated a detrimental effect of blocky retained austenite with low mechanical stability on the two-body abrasion.
Language eng
DOI 10.1007/s11661-016-3690-5
Field of Research 091207 Metals and Alloy Materials
0912 Materials Engineering
0306 Physical Chemistry (Incl. Structural)
0913 Mechanical Engineering
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, The Minerals, Metals & Materials Society and ASM International
Persistent URL http://hdl.handle.net/10536/DRO/DU:30085704

Document type: Journal Article
Collection: Institute for Frontier Materials
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