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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。
Sheet metal rolling deformation deformation can refine the grain of the material, affecting the mechanical parameters of the material. The 4 mm ultra-low carbon and low-alloy steel sheets were rolled to 3 and 2 mm respectively, and sheets of microstructure grains with different sizes were obtained. The mechanical properties of the material were tested by uniaxial tension. The cumulative amount of rolling strain was calculated and its effect on grain refinement was analyzed. The results show that when the cumulative strain reaches the limit value of 0.6534, the ferrite grains become slender. Under the tensile stress, the final grains are continuously refined and show the directionality. Due to the fine grain of granular bainite, it is not easy to be refined at the limit of rolling deformation cumulative amount. The larger the ferrite deformation, the higher the yield strength and tensile strength, and the smaller the elastic modulus and elongation, while the granular bainite grains have little effect on the material properties.