Effect of Cryogenic Treatment on Microstructure and Wear Resistance of Carburized 20CrNi2MoV Steel
| Autor: | Xin Jin, Wang Yu, Chang-sheng Li, Binzhou Li |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
lcsh:TN1-997
Materials science Scanning electron microscope microstructure 02 engineering and technology wear resistance 01 natural sciences Carburizing Carbide 0103 physical sciences General Materials Science lcsh:Mining engineering. Metallurgy 010302 applied physics Austenite retained austenite Metallurgy carbide Metals and Alloys 021001 nanoscience & nanotechnology Microstructure carburizing steel Martensite Cryogenic treatment cryogenic treatment 0210 nano-technology Tribometer |
| Zdroj: | Metals Volume 8 Issue 10 Metals, Vol 8, Iss 10, p 808 (2018) |
| ISSN: | 2075-4701 |
| DOI: | 10.3390/met8100808 |
| Popis: | This paper investigated the response of carburized 20CrNi2MoV steel to cryogenic treatment including microstructure and wear resistance. Two cryogenic treatment methods including cryogenic treatment at &minus 80 ° C (CT) and deep cryogenic treatment at &minus 196 ° C (DCT) as well as conventional heat treatment (CHT) were carried out after carburizing process. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffractometry (XRD) were employed for microstructure characterization. The wear resistance was investigated by ball-on-disc sliding wear test on a multi-functional tribometer. The results show that the wear resistance of the experimental steel has been improved by 17% due to CT and by 25.5% due to DCT when compared to CHT. This significant improvement in wear resistance after cryogenic treatment is attributed to the microstructural changes including the finer martensitic structure, the reduction of retained austenite and the development of fine and more numerous carbides. Among these factors, the precipitation of fine carbides plays a more prominent role in enhancing wear resistance. |
| Databáze: | OpenAIRE |
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