Abstract

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Author(s):: ZHANG Zhongwu; Key Laboratory of Superlight Materials and Surface Technololgy, Ministry of Education, College of Materials
Science and Chemical Engineering, Harbin Engineering University

Abstract:: High strength low alloy (HSLA) steels were developed based on the plain carbon steels. HSLA steels have been applied widely to automobile industry, ship building and marine engineering, and infrastructure construction, etc., due to the moderate mechanical properties, good formability and low cost. With the requirement in the improved properties of steels, specifically weldability and lowtemperature toughness, HSLA steels were strengthened by Cuprecipitation,which have attracted great interest. In this paper, the origin of HSLA steels was introduced firstly, combining with the discussion of the strengthening mechanisms. The emphasis was mainly placed on the dualphase HSLA steels and Cuprecipitation strengthened HSLA steels. The control of steel matrix microstructure and their effects on the mechanical properties were reviewed. Subsequently, phase transformation of matrix and Cu precipitation processes during both isothermal cooling and continuous cooling were reviewed. Finally, the concept of Curich nanoclusters in HSLA and the corresponding advanced characterization methods were introduced. The effects of alloying elements on the formation of Curich nanoclusters were also reviewed.