In Situ Observation of the Peritectic Reaction and Transformation in a Commercial HSLA Steel

  • Tao Liu
  • Dengfu ChenEmail author
  • Songyuan Ai
  • Pingmei Tang
  • Mujun LongEmail author
  • Jie Yang
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


In situ experiments have been performed to investigate the peritectic reaction and transformation in a commercial HSLA steel. The characteristic temperature and interface migration behavior were recorded during the peritectic reaction and transformation were recorded during the cooling. The in situ observed results indicated that the austenite phase (γ) was observed to nucleate at the interface of the liquid and primary δ-ferrite phases. The intermediate γ phase propagated along with the liquid/δ-ferrite interface and gradually isolated the liquid and primary δ-ferrite phases. Subsequently, the annular γ phase laterally grew toward the liquid and δ phases. Moreover, the occurrence of the peritectic reaction turned into a lower temperature as the cooling rate increased. In the peritectic transformation, the γ phase thickened toward both the liquid side and primary δ-ferrite side. The interface migration velocities during the peritectic transformation were obtained by measuring the migration distances of two interfaces versus time. The migration velocity of austenite/δ-ferrite (γ/δ) interface was significantly higher than that of liquid/austenite (L/γ) interface. Furthermore, an increase in the cooling rate accelerated the migration velocities of γ/δ and L/γ interfaces during the peritectic transformation.


In situ observation Peritectic reaction Peritectic transformation HSLA steel Continuous casting 



The work is financially supported by the National Natural Science Foundation of China (NSFC, Project No. 51874060 and 51874059). The authors would like to thank the support by the Natural Science Foundation of Chongqing (Project No. cstc2018jcyjAX0647, cstc2018jszx-cyzdX0076), the China Scholarship Council (CSC).


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© The Minerals, Metals & Materials Society 2020

Authors and Affiliations

  1. 1.College of Materials Science and EngineeringChongqing UniversityChongqingPeople’s Republic of China
  2. 2.Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New MaterialsChongqing UniversityChongqingPeople’s Republic of China

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