Influence of Vanadium on the Microstructure and Mechanical Properties of Medium-Carbon Steels for Wheels
| Autor: | Cai-fu Yang, Guobiao Lin, Pengfei Wang, Zhaodong Li, Shitong Zhou, Qi-long Yong |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
lcsh:TN1-997
Toughness Materials science Metallurgy Metals and Alloys Vanadium chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure 020501 mining & metallurgy precipitation strengthening Precipitation hardening 0205 materials engineering chemistry Ferrite (iron) Volume fraction Hardening (metallurgy) General Materials Science medium-carbon steel grain refinement strength and toughness Pearlite 0210 nano-technology lcsh:Mining engineering. Metallurgy |
| Zdroj: | Metals, Vol 8, Iss 12, p 978 (2018) Metals Volume 8 Issue 12 |
| ISSN: | 2075-4701 |
| Popis: | Steels used for high-speed train wheels require a combination of high strength, toughness, and wear resistance. In 0.54% C-0.9% Si wheel steel, the addition of 0.075 or 0.12 wt % V can refine grains and increase the ferrite content and toughness, although the influence on the microstructure and toughness is complex and poorly understood. We investigated the effect of 0.03, 0.12, and 0.23 wt % V on the microstructure and mechanical properties of medium-carbon steels (0.54% C-0.9% Si) for train wheels. As the V content increased, the precipitation strengthening increased, whereas the grain refinement initially increased, and then it remained unchanged. The increase in strength and hardness was mainly due to V(C,N) precipitation strengthening. Increasing the V content to 0.12 wt % refined the austenite grain size and pearlite block size, and increased the density of high-angle ferrite boundaries and ferrite volume fraction. The grain refinement improved the impact toughness. However, the impact toughness then reduced as the V content was increased to 0.23 wt %, because grain refinement did not further increase, whereas precipitation strengthening and ferrite hardening occurred. |
| Databáze: | OpenAIRE |
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