退火温度和平整工艺对1000 MPa级双相钢组织和力学性能的影响  

Influence of annealing temperature and temper rolling on microstructure and mechanical properties of 1000 MPa grade dual phase steel

作　　者：刘华赛[1,2] 邝霜[1,2] 谢春乾 滕华湘[1,2] 

机构地区：[1]首钢技术研究院,北京100043 [2]绿色可循环钢铁流程北京市重点实验室,北京100043

出　　处：《金属热处理》2017年第8期98-101,共4页Heat Treatment of Metals

基　　金：国家"十二五"科技支撑计划(2012BAF04B02)

摘　　要：采用不同的退火温度和平整工艺对C-Si-Mn系1000 MPa级冷轧双相钢DP1000进行连续退火和平整试验,研究了退火温度和平整延伸率对DP1000钢的组织和力学性能的影响。研究表明:随着退火温度的提高,DP1000钢中的马氏体岛所占的比例和尺寸都逐渐增加;当退火温度为800℃时,可以获得综合性能良好的DP1000双相钢;随着平整延伸率的提高,DP1000双相钢的屈服强度提高,抗拉强度变化不大,伸长率则逐渐降低;随着平整延伸率的增加,DP1000双相钢中铁素体中的位错密度逐渐提高。Microstructure and mechanical properties of a 1000 MPa grade cold-rolled continuous annealed dual phase steel were investigated under different annealing temperature and temper rolling reduction. The results indicate that the size and volume fraction of martensite island in DP1000 steel increases with annealing temperature increasing. When annealing temperature is at 800 ℃,the best strength-ductility combination can be obtained. Furthermore,with temper rolling reduction increasing,the yield strength of the steel increases continuously,but the ultimate tensile strength changes a little,and the elongation of the steel decreases slightly. TEM observation shows dislocation density in ferrite increases with temper rolling reduction increasing.

关 键 词：退火温度 平整延伸率 DP1000钢 微观组织 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]