Hot Deformation Behavior of Vanadium-microalloyed Medium-carbon Steel for Fracture Splitting Connecting Rod

• Published in: Journal of iron and steel research, international Vol. 22; no. 7; pp. 615 - 621
• Main Authors: HUI, Wei-jun, CHEN, Si-lian, SHAO, Cheng-wei, ZHANG, Yong-jian, DONG, Han
• Format: Journal Article
• Language: English
• Published: Singapore Elsevier Ltd 01-07-2015; Springer Singapore
• Subjects: Applied and Technical Physics; dynamic recrystallization; Engineering; fracture splitting connected rod; hot deformation; Machines; Manufacturing; Material; Materials Engineering; Materials Science; Metallic Materials; microalloyed medium-carbon steel; Physical Chemistry; Processes; vanadium; 中碳; 剖分; 动态再结晶; 压缩试验; 微合金非调质钢; 热变形行为; 连杆断裂; 钒化; fracture splitting connected rod; vanadium; microalloyed medium-carbon steel; dynamic recrystallization; hot deformation
• ISSN: 1006-706X; 2210-3988
• DOI: 10.1016/S1006-706X(15)30048-0

Single compression tests were carried out with a Gleeble-3800 thermal simulator to investigate hot deform- ation behavior of two vanadium-microalloyed medium-carbon steels for fracture splitting connecting rod. The tests were performed to a total true strain of 0.92 at true strain rates ranging from 10-2 to 10 s-1 and deformation temper- ature of 900--1 150 ℃, The results show that hot deformation behavior of the tested steels is similar to that of con- ventional medium-carbon microalloyed steels and dynamic recrystallization is easier to occur at higher deformation temperature and lower strain rate. The austenite deformation resistance and activation energy of deformation increase with increasing vanadium content from 0.15% to 0. 28% and thus the starting time of dynamic recrystallization was delayed. Finer recrystallized austenite grain could he obtained at higher strain rate, lower deformation temperature and higher vanadium content. TEM observation of the specimens quenched just before and after deformation reveals that vanadium is mainly in dissolved solute condition in austenite and thus affects the dynamic recrystallization behavior of the tested steels mainly through solute-drag effect.