。88 北京科技大学学报 2007年增刊2 microst ructurerelated length scale.int J Plast.1998,l4(4):【(傅俊岩.钢的显微组织和性能.北京：治金工业出版社，1985 3195李雪彤.王有铭，徐建国.等.590MPa高强度厚钢板的调 【了小指军夫，李伏桃。控制轧制和控制冷却.北京：治金工业出 质工艺参数研究.钢铁，1999,341)：31 版社.2002 Study of direct quenching process for SPV490 steel plate CHEN Yinli,YU Wei,SU Lan,CAI Qingwu,JIANG Weihua Institute of Metallurgical Engineering University of Science and Technobgy Beijing.Beijing 100083.China ABSTRACT The effect of defommation in austenite region and tempering temperature on microstructure and mechanical properties of SPV490 steel was studied.In direct quenching and tempering process,strength of sam- ples w as remarkably increased w hen adopting control rolling in austenite recrystallized zone,while impact tough- ness w as decreased.With 44%deformation in recrystallized zone fortwo-phase rolling,because fine microstruc- ture transformed from austenite with deformed band and high dislocation density was achieved,samples had good mechanical properties. KEY WORDS steel of SPV490;direct quenching:temperingmicrostructure-relat ed length scales.Int J Plast, 1998, 14 ( 4 ) : 3195 李雪彤, 王有铭, 徐建国, 等.590MPa 高强度厚钢板的调 质工艺参数研究.钢铁, 1999, 34( 1) :31 [ 6] 傅俊岩.钢的显微组织和性能.北京:冶金工业出版社, 1985 [ 7] 小指军夫, 李伏桃.控制轧制和控制冷却.北京:冶金工业出 版社, 2002 S tudy of direct quenching process for SPV490 steel plate CHEN Y inli, Y U Wei, SU Lan, CAI Qingwu, JIANG Weihua Institu te of Met allurgical Engineering, University of S cience and Technology Beijing, Beijing 100083, China ABSTRACT The effect of deformation in austenite region and tempering temperature on microstructure and mechanical properties of SPV490 steel was studied .In direct quenching and tempering process, streng th of sam￾ples w as remarkably increased w hen adopting control rolling in austenite recrystallized zone, while impact tough￾ness w as decreased .With 44 %deformation in recrystallized zone fo r two-phase rolling , because fine microstruc￾ture transformed from austenite w ith deformed band and high dislocation density was achieved, samples had g ood mechanical properties . KEY WORDS steel of SPV490 ;direct quenching ;tempering · 88 · 北 京 科 技 大 学 学 报 2007 年 增刊 2