回火对超细贝氏体晶粒取向和尺寸的影响  

Effect of Tempering on Size and Orientation of Grain in Ultra-Fine Grain Bainite Steel

作　　者：陈庆丰[1] 关云[1] 陈邦文[1] 汪福成[1] 刘昌明[1] 严翔[1] 

机构地区：[1]武钢技术中心,武汉430080

出　　处：《特殊钢》2006年第6期52-53,共2页Special Steel

基　　金：国家重大基础研究"973"二期项目(2004C13619102)

摘　　要：用50kg真空感应炉冶炼的钢锭,经1150℃开轧,两阶段控制轧制,830℃终轧成12mm钢板,驰豫27s,720℃进水快冷(冷却速率30～35℃/s)后,超低碳贝氏体钢(成分%:0.023C、1.63Mn、0.52Cu、0.25Mo、0.055(Nb+Ti)、0.0011B)具有板条贝氏体+少量粒状贝氏体和不规则铁素体的复合组织,贝氏体束团尺寸为3～5μm,块状和不规则铁素体尺寸为1～2.5μm。650℃和700℃回火对贝氏体晶粒取向无显著影响。With 50 kg vacuum induction fumace melted ingot, breakdown at 1 150 ℃ and two stage control rolling, 12 mm plate finishing rolling at 830 ℃, then relaxation for 27 s, water cooling at 720 ℃ with cooling rate 30 -35 ℃/s, the ultra-low-carbon bainite steel- 0. 023C, 1.63Mn, 0. 52Cu, 0. 25Mo, 0. 055（ Nb ＋ Ti）, 0. 001 1B had compound structure consisting of lath bainite ＋ minor granular bainite, and irregular ferrite. The bainite bunch colony size was 3 ～ 5μm and the lump and irregular ferrite size was 1～ 2.5μm. Tempering at 650 ℃ and 700 ℃ weren＇t obvious influence on bainite grain orientation.

关 键 词：超低碳贝氏体钢 等效晶粒直径 回火 

分 类 号：TG113.1[金属学及工艺—物理冶金]