Mechanical Properties and Temper Resistance of Deformation Induced Ferrite in a Low Carbon Steel

被引：12

作者：

Hao, Luhan ^{[1
]}

Xiao, Namin ^{[1
]}

Zheng, Chengwu ^{[1
]}

Li, Dianzhong ^{[1
]}

机构：

[1] Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China

来源：

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2010年 / 26卷 / 12期

基金：

中国国家自然科学基金;

关键词：

Low carbon steel; Deformation induced ferrite transformation; Grain size; Mechanical properties; Temper resistance; ULTRAFINE-GRAINED STEELS; STRAIN; MICROSTRUCTURES; TRANSFORMATION; STABILITY; STRENGTH;

D O I：

10.1016/S1005-0302(11)60009-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microstructures and mechanical properties of deformation induced ferrite (DIF) in the low carbon steel Q235 under different deformation temperatures have been investigated systematically. Through deformation induced ferrite transformation (DIFT), ferrite grain can be refined to 3 mu m and accounts for above 85% of the overall fraction. Yield strength of DIF (>500 MPa) is increased by up to 100% compared with the conventional low carbon steel. Comparison of microstructure and mechanical properties in the Q235 steel with DIF and tempered DIF microstructure illustrates that the strengthening mechanism of DIF microstructure is the combination of grain boundary strengthening and carbon supersaturated strengthening. Electron back-scattered diffraction (EBSD) analysis and high magnification scanning electron microscopy (SEM) observation denote that high-angle grain boundary among ultrafine ferrite grain and the transformation product of retain austenite membrane along ferrite boundaries are responsible for the stability of ferrite grain size during tempering process. Transmission electron microscopy (TEM) analysis demonstrates that the transformation product of retained austenite membrane between ferrite grain boundaries is cementite.

引用

页码：1107 / 1113

页数：7

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