超细晶铁素体双峰结构及其对中碳钢力学性能的影响  

Effect of ultrafine grain ferrite bimodal structure on mechanical properties of medium carbon steel

作　　者：张家豪 李红斌 赵志浩 徐海卫 韩赟 田亚强 陈连生 Zhang Jiahao;Li Hongbin;Zhao Zhihao;Xu Haiwei;Han Yun;Tian Yaqiang;Chen Liansheng(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan Hebei 063210,China;Technology Center,Shougang Jingtang Iron and Steel United Co.,Ltd.,Tangshan Hebei 063200,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210 [2]首钢京唐钢铁联合有限责任公司技术中心,河北唐山063200

出　　处：《金属热处理》2023年第5期54-59,共6页Heat Treatment of Metals

基　　金：河北省科技厅重点研发计划(20311004D);河北省自然科学基金高端钢铁冶金联合基金(E2020209124,E2020209127,E2020209040);河北省自然科学基金重点项目(E2022209049)。

摘　　要：对含碳0.49%的中碳钢在两相区不同温度下淬火,随后冷轧50%并退火,制备中碳钢铁素体双峰结构。通过扫描电镜(SEM)、背散射电子衍射(EBSD)对双峰结构进行表征,并通过室温拉伸试验分析了双峰结构对力学性能的影响。结果表明,随两相区淬火温度的升高,铁素体平均晶粒尺寸减小;当淬火温度为770℃时,试验钢的强度最高,750℃时伸长率最高,760℃时强塑积最高。当亚微米晶比例为31.4%,粗细晶峰值晶粒尺寸为2.51和0.79μm时,试验钢具有较好的强塑性匹配。A medium carbon steel with 0.49%C was quenched at different temperatures in two-phase zone,then cold rolled 50%and annealed to obtain the ferritic bimodal structure.The microstructure was characterized by means of scanning electron microscope(SEM)and electron backscattered diffraction(EBSD),and the effect of the bimodal structure on mechanical properties was analyzed by tensile experiments at room temperature.The results show that the average grain size of the ferrite decreases with the increase of the quenching temperature in the two-phase zone.The strength of the tested steel is the highest when quenched at 770℃,the elongation is the highest at 750℃,and the product of strength and elongation is the highest at 760℃.When the proportion of submicron grains is 31.4%and the peak grain sizes of coarse grains and fine grains are respectively 2.51 and 0.79μm,the tested steel has better matching of strength and elongation.

关 键 词：超细晶铁素体 中碳钢 双峰结构 力学性能 强塑积 

分 类 号：TG156.1[金属学及工艺—热处理]