轧制形变累积对超低碳低合金钢的组织演变研究  

Microstructure Evolution of Ultra-low Carbon Low Alloy Steel by Rolling Deformation Cumulation

作　　者：赵茂俞[1] 薛克敏[2] 李萍[2] 田春艳[1] 

机构地区：[1]合肥学院机械工程系,安徽合肥230601 [2]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《热加工工艺》2015年第19期131-133,共3页Hot Working Technology

基　　金：安徽省教育厅自然科学研究重大项目(KJ2011ZD09);安徽省自然科学基金面上项目(1308085ME77)

摘　　要：板料轧制形变累积能细化材料的晶粒,影响材料力学参数。分别多道次轧制4 mm超低碳低合金钢板料到3和2 mm,获得了不同尺寸微观组织晶粒的板料。应用单向拉伸测试了材料的力学性能。计算了板料轧制应变累积量,分析了其对晶粒细化的作用。结果表明,应变累积量接近极限值0.6534时,铁素体晶粒变为细长状;在拉应力的作用下,最终晶粒被不断地细化,且显示方向性。由于粒状贝氏体晶粒细小,在极限的轧制形变累积量下,它不容易被细化。铁素体形变越大,屈服强度和抗拉强度就越高,而弹性模量和伸长率就越小,而粒状贝氏体晶粒对材料性能影响不明显。Deformation accumulation of sheet rolling can refine material grains and affect mechanical parameters of material. Ultra-low carbon low alloy steel sheet was rolled in multi-pass from 4 mm to 3 mm or 2 mm, and the sheets of different grain microstructures were attained. The material mechanieal properties were tested by uniaxial tensile. Rolling accumulative strain was calculated. The effect of it on grain refinement was analyzed. The results indicate that when accumulative strain value closes to the limit 0.6534, the ferrite grains become slender;under the action of the tensile stress,the final grain is refined ceaselessly and displays direction. As grainy bainite grain is smaller, it is not easily refined at the limited cumulative deformation of the rolling. The greater ferrite deformation is, the higher yield strength and tensile strength are, and the smaller elasticity modulus and percentage of elongtation are. However the effect of granular bainite on material properties is not obvious.

关 键 词：轧制 累积 应变 铁素体 晶粒 

分 类 号：TG386[金属学及工艺—金属压力加工] TG156