AlFeMn合金冷轧过程中显微硬度与织构研究  

Study on Microhardness and Texture of AlFeMn Alloy Sheets During Cold Rolling

作　　者：潘琰峰[1,2] 沈以赴 苑锡妮[2] 曹零勇 PAN Yanfeng;SHEN Yifu;YUAN Xini;CAO Lingyong(College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,P.R.China;Research Institute,Baoshan Iron&Steel Co.Ltd.,Shanghai 201999,P.R.China)

机构地区：[1]南京航空航天大学材料科学与技术学院,中国南京211106 [2]宝山钢铁股份有限公司中央研究院,中国上海201999

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2023年第5期618-626,共9页南京航空航天大学学报（英文版）

摘　　要：采用硬度测试仪、透射电镜(Transmission electron microscopy,TEM)、X射线衍射仪(X-ray diffraction,XRD)等手段研究了冷轧过程中AlFeMn合金板材的硬度、微观组织、织构变化。AlFeMn合金的显微硬度先随冷轧率增加而增加,在冷轧率为82%时,硬度达到峰值;然后硬度随冷轧率增加而下降。与此同时,合金中的位错密度明显降低,出现多边化亚晶。结果表明,冷轧过程中,AlFeMn合金存在由加工硬化转变为加工软化的行为。加工软化在中低应变量(≤78%冷轧率)时,copper、S取向含量随冷轧率增加略有增加,而brass取向含量基本保持不变;在达到82%冷轧率时,copper、S、brass取向含量明显急剧增加,在冷轧率超过84%后含量又急剧降低。Cube取向含量在加工硬化期间一直降低,在加工软化后期含量略有增加。结果表明,加工软化的发生伴随有晶粒取向的变化。The microhardness and texture of cold rolled AlFeMn alloy sheets were investigated by means of hardness tester,transmission electron microscopy(TEM),and X-ray diffraction(XRD).It was found that the hardness of the rolled AlFeMn alloy sheet increased with the increase of cold rolling reduction,reaching the peak at 82%cold rolling reduction,and then decreasing.Simultaneously,the dislocation density of the rolled sheets decreased obviously,accompanied by the polygonization of sub-structures.It showed that there was a transition from work hardening to work softening during the cold rolling of AlFeMn alloy.At low and medium strains(≤78%cold rolling reduction),the content of copper and S orientation increased slightly with the increase of cold rolling reduction,while the content of Brass orientation remained almost unchanged.When the cold rolling reduction reached 82%,the content of copper,S and Brass increased sharply,and then decreased sharply when the cold rolling reduction exceeded 84%.The content of cube orientation decreased during the work hardening and increased slightly at the end of work softening.The results showed that the occurrence of work softening was accompanied by changes in grain orientation.

关 键 词：AlFeMn合金 冷轧 显微硬度 微观组织 织构 

分 类 号：TG146.2[一般工业技术—材料科学与工程]