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Open AccessArticle

Thermodynamics Analysis of Multiple Microelements’ Coupling Behavior in High Fatigue Resistance 50CrVA Spring Steel with Nanoparticles

1
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
2
School of Mechanical Engineering, Dongguan University of Technology, Dongguan 523808, China
3
School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China
4
Department of Mechanical Engineering, University of South Florida, Tampa, FL 33620, USA
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(18), 2952; https://doi.org/10.3390/ma12182952
Received: 20 July 2019 / Revised: 22 August 2019 / Accepted: 4 September 2019 / Published: 11 September 2019
Solid solution and coupling precipitation behavior of multiple microelements in 50CrVA spring steel under different temperatures were analyzed based on thermodynamics. Quantitative relationships between the multiple microelements’ contents and secondary phases, and their effects on fatigue life, were systematically studied in conjunction with the secondary phase microstructure characterization using scanning and transmission electron microscopy, etc. The solid solution contents of different microelements decreased as the temperature decreased, especially N and Ti, but the number of compounds gradually increased when the temperature decreased. Carbonitride constitutional liquation occurred in 50CrVA-S1# spring steel-containing microparticles, and without carbonitrides, constitutional liquation occurred in 50CrVA-S2# spring steel-containing nanoparticles. The experimental results indicate that the fatigue life reduces by about an order of magnitude when the secondary phase size changes from nanometers to microns, and the corresponding relationship among multiple microelements, microstructure of secondary phases, and fatigue life, was established in this spring steel. View Full-Text
Keywords: multiple microelements; thermodynamics analysis; nanoparticles; fatigue behavior; spring steel multiple microelements; thermodynamics analysis; nanoparticles; fatigue behavior; spring steel
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Wang, Y.; Fu, L.; Zhou, M.; Zhou, Z.; Pang, X.; Zhong, S.; Volinsky, A.A. Thermodynamics Analysis of Multiple Microelements’ Coupling Behavior in High Fatigue Resistance 50CrVA Spring Steel with Nanoparticles. Materials 2019, 12, 2952.

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