Application of quenching–partitioning–tempering process and modification to a newly designed ultrahigh carbon steel |
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| Affiliation: | 1. School of Materials Science and Engineering, Central South University, Changsha, Hunan Province 410083, PR China;2. Scientific Center of Phase Diagram and Material Design, Central South University, Changsha, Hunan Province 410083, PR China;1. The State Key Laboratory of Rolling & Automation, Northeastern University, Shenyang 110819, China;2. Research Academy, Northeastern University, Shenyang 110819, China;1. School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;2. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;1. Beijing Jiaotong University, Materials Science & Engineering Research Center, Beijing 100044, People’s Republic of China;2. Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, 40237 Düsseldorf, Germany;3. Tsinghua University, Key Laboratory of Advanced Materials, School of Materials Science & Engineering, Beijing 100084, People’s Republic of China |
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| Abstract: | The applicability of quenching–partitioning–tempering (Q–P–T) process to an ultrahigh carbon steel (UHCS) has been investigated by means of optical microscopy (OM), scanning electronic microscopy (SEM) combined with energy-dispersive spectrometry (EDS), X-ray diffraction (XRD) and mechanical property tests. The molten steel was modified with a multi-component modifier-rare earth and a low melting point alloy (Al–Bi–Sb) before casting into iron molds. Observations showed that the carbide exists as partly isolated and fine blocky structure in as-cast microstructure, indicating good effect of modification. After the Q–P–T treatment, carbon was partitioned into austenite from martensite, creating a mixture of carbon-depleted martensite, carbon-enriched retained austenite and fine carbides. This kind of microstructure leads to a much higher impact toughness, 32 J/cm2, in comparison with the value, i.e., no more than 20 J/cm2, of the conventional quenching and tempering (Q–T) treatment at the same hardness level. Furthermore, wear-resisting property of the steel has also been investigated. It showed that the Q–P–T treated steel has better abrasive wear resistance, about 18% increased, compared with the Q–T treated alloy under high load conditions. |
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| Keywords: | Microstructure Ultrahigh carbon steel Quenching–partitioning–tempering Modifier mixture Abrasion resistance |
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