退火温度对Nb-Ti深冲双相钢板组织与性能的影响  

Effects of annealing temperature on microstructure and properties of Nb-Ti deep drawing dual-phase steel sheet

作　　者：陈京京[1] 赵征志[1] 汪志刚[1] 赵爱民[1] 叶洁云[1] 

机构地区：[1]北京科技大学冶金工程研究院,北京100083

出　　处：《金属热处理》2014年第1期15-19,共5页Heat Treatment of Metals

基　　金：中央高校基本科研业务费专项资金(FRF-TP-10-001A);国家自然科学基金(50904006)

摘　　要：利用CCT-AY-Ⅱ型钢板连续退火试验机模拟研究了退火过程中退火温度为840、860、880和900℃时,Nb-Ti系低碳深冲双相钢板组织与性能的变化规律。结果表明,随着退火温度的升高,铁素体晶粒尺寸略有增大,均匀程度增加,同时伸长率、屈服强度、r值呈先上升后下降趋势,在880℃时出现峰值;{111}织构占有率逐渐增加,{111}/{100}值渐增,880℃退火时{111}<110>织构取向分布函数值达到最大,但{111}<110>与{111}<112>取向密度差值也较大。The effects of annealing temperature on microstructure and properties of the low-carbon Nb-Ti deep drawing dual-phase steel sheet were investigated when the tested steel sheets were annealed at 840 ℃, 860 ℃, 880 ℃, 900 ℃ respectively. The results show that, with the increase of the annealing temperature, the ferrite grain size increases a little, and the uniformity increases. The elongation, yield strength and r-value increase first and then decrease, and reach maximum values at 880 ℃. The corresponding { 111 } texture increases gradually and the value of {11 }//{ 100} increases with the increase of annealing temperature. The orientation density of the strongest component { 111 } 〈 110 〉 reaches to a maximal value when the sheet is annealed at 880 ℃, however the difference of orientation distribution density increases between { 111} 〈 110 〉 and { 111 } 〈 112 〉 texture.

关 键 词：深冲双相钢 退火温度 显微组织 力学性能 织构 

分 类 号：TG115.6[金属学及工艺—物理冶金] TG142.7[金属学及工艺—金属学]