轧制变形对F-M双相钢0.05C-2.8Mn-4.2Ni-2Al-1.2Mo-1.9Cu晶粒细化的影响  

Effect of Rolling Deformation on Grain Refinement of F-M Dual Phase Steel 0.05C-2.8Mn-4.2Ni-2Al-1.2Mo-1.9Cu

作　　者：马才女 高雪云[1,2] 呼陟宇 翟亭亭 李瑞红[1] 王海燕[1,2] 薛春江[3] MA Cai-nv;GAO Xue-yun;HU Zhi-yu;ZHAI Ting-ting;LI Rui-hong;WANG Hai-yan;XUE Chun-jiang(School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010;Inner Mongolia Autonomous Region Key Laboratory of Advanced Metal Materials,Baotou 014010;Engineering Training Center,Inner Mongolia University of Science and Technology,Baotou 014010)

机构地区：[1]内蒙古科技大学材料与冶金学院,包头014010 [2]内蒙古自治区新金属材料重点实验室,包头014010 [3]内蒙古科技大学工程训练中心,包头014010

出　　处：《特殊钢》2022年第3期91-94,共4页Special Steel

基　　金：国家自然科学基金项目(51764047);内蒙古科技大学创新基金(2019QDL-B15)资助。

摘　　要：借助EBSD场发射扫描电子显微镜,研究了轧制变形及热处理后的铁素体/马氏体双相钢0.05C-2.8Mn4.2Ni-2Al-1.2Mo-1.9Cu显微组织演变及力学性能。结果表明,经900℃30%+780℃75%变形,500℃退火的F-M钢晶粒尺寸0.97μm,屈服抗拉强度和延伸率分别为876MPa,976MPa和15.2%,经900℃30%+780℃50%变形,500℃退火的F-M钢晶粒尺寸1.54μm,屈服、抗拉强度和延伸率分别为801 MPa,895 MPa和19.4%。由轧制变形导致的晶粒细化、小角度晶界增多,是提高实验钢强度的主要原因。然而,较大的轧制变形量也使过多的小角度晶界阻碍位错运动,从而导致实验钢在塑性变形过程中,延展性略差。By field emission scanning electron microscope equipped with an EBSD imaging system the structure and properties of ferritic/martensitic dual-phase steel 0.05 C-2.8 Mn-4.2 Ni-2 Al-1.2 Mo-1.9 Cu after rolling deformation and heat treatment are studied.The results show that by rolled with 900 ℃ 30%+780℃ 75% deforming and 500 ℃annealed,of FM steel the grain size 0.97 μm,yield、tensile strength and elongation are respectively 876 MPa,976 MPa and 15.2%,and by rolled with 900 ℃30%+780 ℃ 50% deforming and 500 ℃ annealed,of F-M steel the grain size 1.54 μm,yield、tensile strength and elongation are respectively 801 MPa,895 MPa and 19.4%.The grain refinement and the increase of small-angle grain boundaries caused by rolling deformation are the main reasons for improving the strength of the experimental steel.However,the large rolling deformation also makes too many small-angle grain boundaries hinder the movement of dislocations,which leads to more difficult deformation and slightly poorer ductility in the plastic deformation process of the experimental steel.

关 键 词：F-M双相钢 轧制 EBSD 晶粒细化 

分 类 号：TG335[金属学及工艺—金属压力加工] TG142.1[一般工业技术—材料科学与工程]