TWIP钢的孪晶及其对Hall-Petch关系的影响  

Twins of TWIP Steel and Its Effect on Hall-Petch Relationship

作　　者：伍翠兰[1] 艾倍倍[1] 谢盼[1] 陈汪林[1] 李久茂[1] 

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2013年第6期80-85,共6页Journal of Hunan University:Natural Sciences

基　　金：国家重点基础研究发展计划(973计划)资助项目(2009CB623704);国家自然科学基金资助项目(51071064);湖南省自然科学基金资助项目(09JJ6002)

摘　　要：采用背散射电子衍射、透射电子显微镜和拉伸实验等研究了退火温度对冷轧态Fe-25Mn-3Al-3Si TWIP钢微观组织及力学性能的影响,并分析了Hall-Petch关系.结果表明,完全再结晶组织由等轴晶和退火孪晶组成,再结晶晶粒平均尺寸随退火温度的升高单调增大,∑3晶界面积分数随退火温度升高而呈现波动增加,850℃退火1h后∑3晶界面积分数达到44%.拉伸过程中强度与晶粒大小都服从Hall-Petch关系,但孪晶界影响Hall-Petch关系斜率K(ε)的大小.TWIP钢K(ε)-ε关系不同于一般钢材常温下的K(ε)随ε增加单调上升,TWIP钢K(ε)随着ε的增加逐渐增大,然后出现平台,最后下降.The effect of annealing temperature on the microstructures and mechanical properties of the cold-rolled Fe-25Mn-3Al-3Si TWIP was studied by means of electron backscatter diffraction technology,transmission electron microscope and tensile test.The Hall-Petch relationship was analyzed in detail.The results have shown that the microstructure of the fully recrystallized samples consists of equiaxed grains and annealing twins.With the increase of the annealing temperature,the grain size is continuously increasing while the fraction ofΣ3grain boundaries is fluctuantly increasing.After annealed at 850℃for 1h,the Σ3grain boundaries reach 44%.In the tensile process,the relationship of strength and grain size obeys the Hall-Petch relationship,but twin boundaries affect the slope Kof the Hall-Petch relationship.The K（ε） εrelationship of the TWIP steel is different from that of general steels at room temperature,in which K（ε） monotonically increases with the strainε.The K（ε） of the TWIP steel increases first,then,keeps unchanged and finally decreases with the strainε.

关 键 词：孪晶 退火 孪晶诱导塑性钢 HALL-PETCH关系 ∑3晶界 

分 类 号：TG113[金属学及工艺—物理冶金]