Continuous Cooling Bainite Transformation Characteristics of a Low Carbon Microalloyed Steel under the Simulated Welding Thermal Cycle Process

doi:10.1016/j.jmst.2013.03.022

J. Mater. Sci. Technol. ›› 2013, Vol. 29 ›› Issue (5): 446-450.DOI: 10.1016/j.jmst.2013.03.022

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Continuous Cooling Bainite Transformation Characteristics of a Low Carbon Microalloyed Steel under the Simulated Welding Thermal Cycle Process

Xiangwei Kong¹⁾, Chunlin Qiu²⁾

1) School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110004, China
2) State Key Laboratory of Rolling Technology and Automation, Northeastern University, Shenyang 110819, China

Received:2012-11-25 Revised:2013-01-15 Online:2013-05-30 Published:2013-05-17
Contact: X. Kong
Supported by:
financial support of Shenyang Key Laboratory of Construction Project (Grant No. F12-256-1-00) and Science Foundation for the Excellent Youth Scholars of Ministry of Education of China (Grant No. 90403006)

Abstract

Abstract:

Continuous cooling transformation of a low carbon microalloyed steel was investigated after it was subjected to the simulation welding thermal cycle process and the interrupted cooling test. Microstructure observation was performed by optical microscopy and transmission electron microscopy. On the basis of the dilatometric data and microstructure observation, the continuous cooling transformation (CCT) diagram was determined, which showed that the main microstructure changes from a mixture of lath martensite and bainitic ferrite to full granular bainite with the increase in the cooling time t_8/5 from 10 to 600 s, accompanied with a decrease in the microhardness. The interrupted cooling test confirmed that the bainitic ferrite can form attached to grain boundaries at the beginning of transformation even if the final microstructure contains a mixture of granular bainite and bainitic ferrite.

Key words: Low carbon microalloyed steel, Bainitic ferrite, Continuous cooling transformation, Welding

Xiangwei Kong, Chunlin Qiu. Continuous Cooling Bainite Transformation Characteristics of a Low Carbon Microalloyed Steel under the Simulated Welding Thermal Cycle Process[J]. J. Mater. Sci. Technol., 2013, 29(5): 446-450.

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Continuous Cooling Bainite Transformation Characteristics of a Low Carbon Microalloyed Steel under the Simulated Welding Thermal Cycle Process

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