Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (4): 495-505.DOI: 10.1007/s40195-018-0797-2

Special Issue: 2019年钢铁材料专辑 2019年腐蚀专辑-1

• Orginal Article • Previous Articles     Next Articles

Hot Deformation and Corrosion Resistance of High-Strength Low-Alloy Steel

Wilasinee Kingkam1, Cheng-Zhi Zhao12, Hong Li1, He-Xin Zhang1,2(), Zhi-Ming Li3   

  1. 1 College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
    2 Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China
    3 College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
  • Received:2018-05-24 Revised:2018-06-25 Online:2019-04-10 Published:2019-04-19
  • Contact: Zhang He-Xin
  • About author:

    Dr. Kun-Kun Deng was born in 1983 and was awarded Ph. D in Harbin University of Technology in 2011. After graduation, he worked in the College of Materials Science and Engineering, Taiyuan University of Technology. At the same time, he continued his research work on the design, fabrication and processing of advanced Mg-based material in. Now, he is the vice chairman of Youth Committee in Magnesium Alloy Branch of Chinese Materials Research Society. He was denoted as young academic pacemaker of Shanxi Province in 2018. He has held two projects of National Nature Science Foundation of China, one project of Specialized Research Fund for the Doctoral Program of Higher Education, one Project of International Cooperation in Shanxi and two projects of Natural Science Foundation of Shanxi. He has published more than 60 articles. The time cited is more than 840 (without selfcitations), and the H-index is 22. In addition, he has published one academic monograph and acquired eight Chinese patents.

Abstract:

The hot deformation characteristics and the corrosion behavior of a high-strength low-alloy (HSLA) steel were investigated at deformation temperatures ranging from 800 to 1100 °C and strain rates ranging from 0.1 to 10 s-1 using an MMS-200 thermal simulation testing machine. Based on the flow curves from the experiment, the effects of temperature and strain rate on the dynamic recrystallization behavior were analyzed. The flow stress decreased with increasing deformation temperature and decreasing strain rate. With the assistance of the process parameters, constitutive equations were used to obtain the activation energy and hot working equation. The hot deformation activation energy of HSLA steel in this work was 351.87 kJ/mol. The work hardening rate was used to determine the critical stress (strain) or the peak stress (strain). The dependence of these characteristic values on the Zener-Hollomon parameter was found. A dynamic recrystallization kinetics model of the tested HSLA steel was constructed, and the validity of the model was confirmed by the experimental results. Observation of the microstructures indicated that the grain size increased with increasing deformation temperature, which led to a lowered corrosion resistance of the specimens.

Key words: Dynamic recrystallization, Potentiodynamic polarization, Hot deformation, Flow stress, High-strength low-alloy steel