Effect of Fast Cooling Rate on the Microstructure and Mechanical Properties of Low-Carbon High-Strength Steel Annealed in the Intercritical Region

被引：6

作者：

Li Zhuang ^{[1
]}

Tian Yong ^{[2
]}

Kang Shaopu ^{[1
]}

Zheng Zhen ^{[1
]}

Liu Ming ^{[1
]}

机构：

[1] Shenyang Aerosp Univ, Sch Mat Sci & Engn, Shenyang 110136, Peoples R China

[2] Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110004, Peoples R China

来源：

JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION | 2014年 / 29卷 / 03期

基金：

中国国家自然科学基金;

关键词：

cooling rate; low-carbon high-strength steel; intercritical annealing; microstructure; mechanical properties; DUAL-PHASE STEELS; RETAINED AUSTENITE; TENSILE PROPERTIES; TRANSFORMATION; SI; DEFORMATION; MORPHOLOGY; FERRITE;

D O I：

10.1007/s11595-014-0959-7

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of fast cooling rate on the microstructure and mechanical properties of low-carbon high-strength steel annealed in the intercritical region was investigated using a Gleeble 1500 thermomechanical simulator and a continuous annealing therrnomechanical simulator. The results showed that the microstructure consisted of ferrite and bainite as the main phases with a small amount of retained austenite and martensite islands at cooling rate of 5 and 50 degrees C/s. respectively. Fast cooling after continuous annealing affected all constituents of the microstructure. The mechanical properties were improved considerably. Ultimate tensile strength CUTS) increased and total elongation (TEL) decreased with increasing cooling rate in all specimens. The specimen 1 at a cooling rate of 5 degrees C/s exhibited the maximum TEL and UTSxTEL (20% and 27 200 MPa%, respectively) because of the competition between weakening by presence of the retained austenite plus the carbon indigence by carbide precipitation, and strengthening by martensitic islands and precipitation. The maximum UTS and YS (1 450 and 951 MPa, respectively) were obtained for specimen 2 at a cooling rate of 50 degrees C/s. This is attributed to the effect of dispersion strengthening of finer martensite islands and the effect of precipitation strengthening of carbide precipitates.

引用

页码：572 / 577

页数：6

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