Effect of Phosphorus Grain Boundaries Segregation and Precipitations on Mechanical Properties for Ti-IF Steel after Recrystallization Annealing

J Mater Sci Technol ›› 2010, Vol. 26 ›› Issue (9): 793-797.

• Mechanical and Functional Properties of Materials • Previous Articles Next Articles

Effect of Phosphorus Grain Boundaries Segregation and Precipitations on Mechanical Properties for Ti-IF Steel after Recrystallization Annealing

Xinli Song, Zexi Yuan, Juan Jia, Di Wang, Pinghe Li, Zhaojun Deng

1) Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
2) Iron and Steel Research Center, Wuhan Iron and Steel Group Corporation, Wuhan 430080, China

Received:2009-10-12 Revised:2010-03-10 Online:2010-09-21 Published:2010-09-21
Contact: Song XinLi
Supported by:
the National Natural Science Foundation of China under Grant No. 50901054

Abstract

Abstract:

The cold-rolled (75% reduction ratio) Ti-IF (interstitial-free) steels of 1 mm thickness were recrystallized by annealing at 810°C for different times. The microstructure, mechanical properties and phosphorus segregation at grain boundary were investigated by means of optical microscopy (OM), tensile testing and field emission transmission electron microscopy (FE-TEM). It was observed that recrystallization was completed after annealing at 810°C for 180 s. The yield strength and tensile strength decreased as annealing time increased. The FE-TEM observation showed that after the annealing treatment, the grain boundary was broadened and the dislocations with higher density of phosphorus atoms and phosphide at grain boundaries became evident. The amount of phosphorus segregated at grain boundaries increased with annealing time.

Key words: IF (interstitial-free) steel, Segregation, Mechanical properties, Recrystallization annealing

Xinli Song Zexi Yuan Juan Jia Di Wang Pinghe Li Zhaojun Deng. Effect of Phosphorus Grain Boundaries Segregation and Precipitations on Mechanical Properties for Ti-IF Steel after Recrystallization Annealing[J]. J Mater Sci Technol, 2010, 26(9): 793-797.

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Effect of Phosphorus Grain Boundaries Segregation and Precipitations on Mechanical Properties for Ti-IF Steel after Recrystallization Annealing

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