Enhancing the Mechanical Properties of Vanadium-Microalloyed Medium-Carbon Steel by Optimizing Post-Forging Cooling Conditions. Issue 6 (25th April 2016)

• Record Type: Journal Article
• Authors: Hui, Weijun; Zhang, Yongjian; Shao, Chengwei; Chen, Silian; Zhao, Xiaoli; Dong, Han
• Is Part Of: Materials and manufacturing processes. Volume 31:Issue 6(2016)
• Page Start: 770
• Page End: 775
• Publication Date: 2016-04-25
• Subjects: Cooling -- Forging -- Hardening -- Microstructure -- Properties -- Steel -- Tensile -- Vanadium; Manufacturing processes -- Periodicals; Materials -- Periodicals; Manufactured Materials; 670.5
• DOI: 10.1080/10426914.2015.1070416
• Languages: English
• ISSNs: 1042-6914

Abstract

Abstract : The effects of different cooling conditions after forging on the microstructural characteristics and mechanical properties of a kind of high-content V-microalloyed medium-carbon steel 37MnSiVS were investigated. The effects were studied by using optical microscopy, transmission electron microscopy and tensile tests. Increasing direct cooling rate after forging is found to increase strength while slightly decrease ductility. A significant increase of strength could be obtained after forced air cooling and then short time isothermal holding at 873 K, while strength decreases gradually with further increasing holding time. The variations of microstructural characteristics especially V(C, N) precipitation strengthening effects with cooling conditions are mainly responsible for these variations of tensile properties. For the investigated high V-containing MA steel, a direct cooling strategy after finish forging is proposed, which includes accelerated cooling with forced air in ferrite range, following by short time isothermal holding or very slow cooling at around 873 K and then air cooling.