Transactions of Materials and Heat Treatment

Title：Analysis on mechanical properties and microstructure evolution for automotive high carbon steel in cold drawing

Authors： Yang Jinping

Unit： Shanxi Jiaotong Vocational and Technical College

KeyWords： high carbon steel cold drawing tempering tensile strength cementite

ClassificationCode：TG142

year,vol(issue):pagenumber：2019,44(12):182-186

Abstract：

In order to improve the mechanical strength and toughness of cold drawing high carbon steel on automobile tires, the changes of microstructure and mechanical properties of cold drawing high carbon steel obtained under different strain and tempering conditions were analyzed by tensile mechanics, SEM, TEM and DSC, and the corresponding microstructure and properties under different process conditions were characterized. The results show that with the increasing of strain, the proportion of tensile strength for high carbon steel increased by tempering is smaller, and the tempering treatment improves the strength of cold drawing high carbon steel to cause a slight reduction in plasticity. After tempering at 175 ℃, the lamellar pearlite is still in parallel with the drawing direction, and many nanoscale cementite particles are formed in the lamellar cementite. However, after tempering at 150 ℃, nanoparticles and segregation C formed by in-situ recrystallization can produce strong pinning effect on dislocations, and significantly improve the deformation resistance of high carbon steel. Thus, when the strain is 3.0, only two exothermic peaks are formed in high carbon steel, and when the strain is 5.0, three exothermic peaks are formed.

Funds：

山西省自然科学基金资助项目(20140321014-02)

杨晋平（1973），男，硕士，讲师 E-mail：pangshanmei079049@126.com

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