摘要
为了研究铁素体轧制和奥氏体轧制两种不同热轧工艺对超薄规格冷轧IF钢组织、织构和成形性能的影响,采用金相显微镜和XRD衍射仪分别观察和检测了两种热轧工艺下热轧、冷轧、退火带钢微观组织和宏观织构,采用EBSD检测了退火带钢的表面微观织构,采用拉伸试验机分别检测了退火带钢沿轧向、45°方向和横向的力学性能。结果表明:相比奥氏体轧制工艺,铁素体轧制工艺下退火带钢γ织构更强,主要织构组元{111}<110>、{111}<112>强度差异更小,相应r值提高0.45,△r值降低0.10;铁素体轧制工艺下冷轧带钢位错、亚晶界等晶体缺陷密度更大,且形成的α织构更强,退火过程中具备<110>//ND取向的晶粒优先形核,且在生长过程中吞并邻近低取向差的{118}<110>、{557}<110>等其他取向晶粒,从而导致退火板形成更强的{111}织构。
In order to investigate the influence of ferrite rolling and austenite rolling technology on the microstructure,texture and formability of ultra-thin gauge cold rolled IF steel,the microstructure and macrotexture of the hot rolled,cold rolled and annealed strip were observed and detected respectively by OA and XRD,the microtexture of the annealed strip was detected by EBSD,the mechanical properties of annealed strip along the rolling direction,45 degree from the rolling direction,transverse direction were tested by tensile testing machine.The results showed that compared with austenite rolling technology,the annealed strip processed with ferrite rolling technology had strongerγtexture and showed little intensity variation between the main texture component{111}<110>、{111}<112>,thus the r value increased by 0.45 and the△r value decreased by 0.10 correspondingly.The cold rolled strip processed with ferrite rolling technology gained a higher density of dislocation、subgrain boundary and other crystal defect and formed a strongerαtexture,the grain owned<110>//ND orientation nucleated preferentially and annexed other surrounding grain with low misorientation such as{118}<110>、{557}<110>during the subsequent annealing process,thus formed a stronger{111}texture in the annealed sheet.
作者
孙超凡
周旬
方圆
李瑞
SUN Chaofan;ZHOU Xun;FANG Yuan;LI Rui(Technology Institute of Shougang Group Co.,Ltd.,Beijing 100043,China;Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology,Beijing 100043,China;Hot Rolling Department,Shougang Jingtang United Iron and Steel Co.,Ltd.,Tangshan 063210,China)
出处
《轧钢》
2023年第3期40-46,71,共8页
Steel Rolling
关键词
轧制工艺
超薄规格
IF钢
织构
成形性能
rolling technology
ultra-thin gauge
IF steel
texture
formability
