Investigation on microstructural and mechanical properties of sub-zero processed AISI 440C steel
| Autor: | Rama Thirumurugan, Shanmugam, Vignesh Kumar |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Austenite Materials science Precipitation (chemistry) Metallurgy Metals and Alloys Zero (complex analysis) 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Residual 01 natural sciences Carbide Martensite 0103 physical sciences Materials Chemistry Physical and Theoretical Chemistry 0210 nano-technology Sliding wear |
| Zdroj: | International Journal of Materials Research. 111:761-770 |
| ISSN: | 2195-8556 1862-5282 |
| DOI: | 10.3139/146.111938 |
| Popis: | Sub-zero processing is an effective method to enhance the mechanical properties of steel due to the complete removal of residual austenite, and better precipitation of secondary carbides. Especially, the sub-zero processing temperature significantly influences the mechanical properties of steel. In the present study, the impacts of shallow and deep sub-zero processing on the microstructure, hardness, wear characteristics, and toughness of 440C martensitic steel were evaluated. An attempt has been made to correlate the influences of microstructural changes on these measured properties. It was found that although shallow sub-zero processing was capable of reducing the amount of residual austenite, deep sub-zero processing was required for its complete removal. Due to the low-temperature martensite formation at −196 °C, deep sub-zero processed specimens possessed a twinned martensite microstructure that significantly improved their strength. Furthermore, deep sub-zero processing increased the volume of micro-carbides by driving alloying carbides to the nearby defects. Hence, deep sub-zero processing led to a 15% improvement in hardness and up to a 60% improvement in wear resistance with an 11% drop in toughness. In contrast, shallow sub-zero processing improved the hardness and wear resistance by 7% and 23%, respectively, with a 30% drop in toughness. |
| Databáze: | OpenAIRE |
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