Effect of intercritical temperature on the strain hardening of dual-phase bainite/ferrite steel

被引:10
|
作者
Nawaz, Bilal [1 ]
Yang, Zhinan [2 ,3 ]
Zhang, Fucheng [1 ,2 ]
Li, Junkui [1 ]
机构
[1] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao, Hebei, Peoples R China
[2] Yanshan Univ, Natl Engn Res Ctr Equipment & Technol Cold Strip, Qinhuangdao 066004, Hebei, Peoples R China
[3] State Key Lab Aviat Precis Bearings, Luoyang 471039, Henan, Peoples R China
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
Vanadium carbides; strain hardening; cold rolling; localisation; Dual-phase; alloy-cementite; recrystallization; mechanical properties; MECHANICAL-PROPERTIES; DEFORMATION; STRENGTH;
D O I
10.1080/02670836.2020.1809854
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Medium-carbon dual-phase bainite/ferrite steels with different bainite and carbide volume fractions were prepared via intercritical annealing and austempering. Bainite dominated the microstructure at high intercritical temperatures, and carbides and ferrite phase dominated at low temperatures. Carbides existed in two types, undissolved alloy-cementite and vanadium carbide. The ferrite grain size was reduced to 1.22 +/- 0.7 mu m at 790 degrees C. Modified Crussard-Jaoul (MC-J) model was used to analyse the strain hardening process, and the highest strain hardening rate was obtained at 755 degrees C. The high carbide fraction at 755 degrees C increased the ferrite dislocation density and enhanced the ferrite phase strength. The high dislocation density in ferrite and the small strength difference in bainite and ferrite enhanced the strain hardening rate at 755 degrees C.
引用
收藏
页码:1614 / 1620
页数:7
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