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Effect of Initial Microstructure on Warm Deformation Behavior of 45 Steel

Journal of Iron and Steel Research International 2012年第8期19卷 75-78页

作者： ZHAO Xin1, YANG Xiao-ling2, JING Tian-fu3 (1. The Sixth Department, zhengzhou Institute of Aeronautics, zhengzhou 450015, Henan, China 2. zhengzhou zhongxing basic constructions development co ltd, zhengzhou 450015, Henan, China 3. State Key Laboratory of Metastable Materials Science and Technology, Qinhuangdao 066004, Hebei, China) The Sixth Department Zhengzhou Institute of Aeronautics Zhengzhou Henan China zhengzhou zhongxing basic constructions development co ltd Zhengzhou Henan China State Key Laboratory of Metastable Materials Science and Technology Qinhuangdao Hebei China

In order to investigate the effect of initial microstructure on warm deformation behavior, some specimens of 45 steel were annealed and some quenched. Then the specimens were isothermally compressed on a Gleeble 3500 machine. The deformation temperature range was 550 to 700 ℃ and the strain rate range was 0.001 to 0.1 s-1. An optical microscope (OM) and a transmission electron microscope (TEM) were used to study the microstructures. The results show that the microstructure of annealed specimens is ferrite and pearlite and that of quenched specimens is martensite. The flow stress of quenched specimens is higher than that of annealed ones at 550 ℃ when strain rates are greater than 0.001 s-1. However, at 600 to 700 ℃ and strain rate of 0.001 s-1, the whole flow curves of quenched specimens are below that of annealed ones. Under the rest conditions, the flow stress of quenched specimens is higher at the beginning of compression and then the opposite is true after the strain is greater than a critical value. The microstructure examination proves that the tempering and dynamic recrystallization easily occur in the specimens with martensite during warm compression, which results in the above phenomena.

关键词： warm deformation flow stress steel microstructure

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Processing Maps for Use in Hot Working of Ductile Iron

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Journal of Iron and Steel Research International 2011年第4期18卷 48-51,72页

作者： ZHAO Xin YANG Xiao-ling JING Tian-fu The Sixth Department Zhengzhou Institute of Aeronautics Zhengzhou 450015 Henan China zhengzhou zhongxing basic constructions development co ltd Zhengzhou 450015 Henan China State Key Laboratory of Metastable Materials Science and Technology Qinhuangdao 066004 Hebei China

The hot deformation characteristics of ductile iron are studied in the temperature range of 973 to 1273K and strain rate range of 0.001 to 1 s-1 by using hot compression *** maps for hot working are developed on the basis of the variations of efficiency of power dissipation with temperature and strain *** results reveal that the flow stress of ductile iron is sensitive to strain *** the processing map under strain of 0.7,a domain is centered at 1273 K and 1 s-1,and the maximum efficiency is more than 36%.According to the maps,the zone with the temperature range of 1173 to 1273 K and strain rate range of 0.1 to 1 s-1 may be considered as the optimum region for hot working.

关键词： ductile iron processing map hot working

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