Transactions of Materials and Heat Treatment

Title：Influence of continuous annealing temperature on microstructure and mechanical properties for high strength IF steel

Authors： Chen Aihua Huo Changjun Yue Chongxiang Li Hualong

Unit： Institute of Research of Iron and Steel Shasteel Jiangsu Shagang Group Co. Ltd.

KeyWords： continuous annealing high strength IF steel annealing temperature mechanical properties texture

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2018,43(7):192-196

Abstract：

The influences of different continuous annealing temperatures on the microstructure,texture and mechanical properties of high strength IF steel were researched. The results show that the grains of annealing plates are not fully recrystallized when the continuous annealing temperature is 760 ℃, and the yield strength is higher. On the contrary, the elongation, the strain hardening exponent n value, the plastic strain ratio r value and the {111} texture strength are lower. With the increasing of annealing temperature, the elongated grains disappear, the grain size and uniformity of annealing plates increase, the yield strength decreases, and the elongation, n value and r value increase. When the annealing temperature is higher than 790 ℃, the γ texture is the main texture in annealing plates. With the continuously increasing of annealing temperature, the difference of {111}<110> and {111}<112> orientation strength decreases as well as the homogeneity increases. Above all, rising the continuous annealing temperature is benefitial for increasing microstructure uniformity, formability and deep drawability of high strength IF steel.

Funds：

陈爱华（1985-），女，硕士，工程师，E-mail：cahly02@163.com

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