Effect of Short?Term Low?Temperature Austempering on the Microstructure and Abrasive Wear of Medium?Carbon Low?Alloy Steel

Quanshun Luo; Haijuan Mei; Matthew Kitchen; Yubi Gao; Leon Bowen

doi:10.1007/s12540-020-00957-6

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자료유형: 학술저널

저자정보: Quanshun Luo (Sheffield Hallam University) Haijuan Mei (Guangdong University of Technology) Matthew Kitchen (Sheffield Hallam University) Yubi Gao (Lanzhou University of Technology) Leon Bowen (Durham University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.9

발행연도: 2021.9

수록면: 3,115 - 3,131 (17page)

DOI: 10.1007/s12540-020-00957-6

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Nano-bainitic steels have attracted great attention for good wear resistance. In this research, a medium-carbon low-alloyedsteel was austempered at a low temperature close to its martensite-start temperature for various times to obtain mixed microstructureof nano-bainite, martensite and retained austenite. The austempered samples were characterised comprehensively byfield-emission SEM and quantitative XRD. Its two-body abrasive wear property was evaluated by sliding on a SiC abrasivedisc. The results revealed the formation of initial nano-width carbide-free bainitic ferrite (BF) after austempering by 10 min,whereas the BF size and amount both increased with the austempering time. The austempered samples exhibited wear coefficientslower than the quenched martensitic sample by up to 50%. SEM and TEM observations showed wear mechanismsof micro-cutting and ploughing deformation, including the formation of a nano-laminate top layer and bending deformationin the subsurface multiphase microstructure. The decreased wear loss was attributed to the role of retained austenite in theincreased plasticity.

#Low-temperature austempering #Bainite transformation #Trained austenite #Carbon partitioning #Abrasive wear

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