A novel and simple technique for development of dual phase steels with excellent ductility

被引:82
作者
Ashrafi, H. [1 ]
Shamanian, M. [1 ]
Emadi, R. [1 ]
Saeidi, N. [1 ]
机构
[1] Isfahan Univ Technol, Dept Mat Engn, Esfahan 8415683111, Iran
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2017年 / 680卷
关键词
Dual phase steel; Mechanical characterization; Ductility; work hardening; WORK-HARDENING BEHAVIOR; MECHANICAL-PROPERTIES; MARTENSITE MORPHOLOGY; VOLUME FRACTION; TENSILE PROPERTIES; FRACTURE-BEHAVIOR; GRAIN-SIZE; FERRITE; MICROSTRUCTURE; STRENGTH;
D O I
10.1016/j.msea.2016.10.098
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
A new and simple approach was introduced to produce dual phase (DP) steels with excellent ductility. This technique included intercritical annealing of a cold-rolled ferrite-pearlite structure followed by water quenching to produce a ferrite-martensite duplex structure, and a subsequent short intercritical annealing at a lower temperature followed by water quenching to produce the final DP steel. It was found that the microstructure of the newly developed DP steel consisted of chain-like networked martensite in the ferrite matrix with both ultrafine and coarse grain structure. Despite the same value of ultimate tensile strength (-736 MPa), the uniform elongation and total elongation of the newly developed DP steel were 52% and 54% higher than those for a DP steel with the same composition and martensite volume fraction produced by conventional intercritical annealing. This new DP steel also exhibited a superior strength-elongation balance (UTS xTE > 30,000 MPa%) in comparison with commercial and thermomechanically processed DP steels. The newly developed DP steel showed two stages of work hardening based on the Kocks-Mecking approach corresponding to an initial rapid decrease of work hardening rate cla/de) with stress followed by stage III hardening. This steel also exhibited larger values of work hardening exponent in the Hollomon and Ludwik equations compared with the intercritically annealed DP steel.
引用
收藏
页码:197 / 202
页数:6
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