Experimental Research on Thermo-mechanical Control Process for High Strength Non-quenched and Tempered Cold Heading Steel

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Journal of Materials Engineering ›› 2011, Vol. 0 ›› Issue (11) : 35-38.

Experimental Research on Thermo-mechanical Control Process for High Strength Non-quenched and Tempered Cold Heading Steel

CAO Jie^1,2, YAN Jun², LIU Ya-zheng¹, ZHANG Jing², SUN Wei³, YU Tong-ren³, LIU Mei-ling²

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Abstract

Tests were carried out on a Gleeble-3500 simulator to simulate the low temperature rolling process for a newly developed non-quenched and tempered cold heading steel.The effects of deformation and cooling rate on microstructure transformation were analyzed.The results show that the microstructure of the steel is mainly granular bainite when the cooling rate is above 5℃/s.The matrix of the granular bainite changes from massive shape to lath shape with the increasing of cooling rate.The deformation of austenite not only promotes the nucleation and growth of ferrite,but also has an influence on the microstructure of granular bainite.Large deformation induces ferrite transformation.The hardness testing suggests that the hardness decreases with the increasing of deformation.

Key words

non-quenched and tempered steel / deformation degree / cooling rate / granular bainite / hardness

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CAO Jie, YAN Jun, LIU Ya-zheng, ZHANG Jing, SUN Wei, YU Tong-ren, LIU Mei-ling. Experimental Research on Thermo-mechanical Control Process for High Strength Non-quenched and Tempered Cold Heading Steel[J]. Journal of Materials Engineering, 2011, 0(11): 35-38

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