【摘要】 采用ECAP方法对TWIP钢(30Mn-3Si-3Al)试样进行一道次等径角挤压(ECAP)变形,对比研究原始态、一道次挤压态、ECAP1P+850℃×1 h(空冷)处理和ECAP1P+1 000℃×1 h空冷处理后的微观结构及力学性能。试验结果表明:在变形过程中,形变孪晶的相互形变阻力和位错在形变孪晶界的大量塞积,使TWIP钢表现出很高的加工硬化率。试样经ECAP1P+1 000℃×1 h空冷处理,与原始态相比在强度不变的情况下塑性有一定提高。同时,退火后晶粒的长大增加了位错沿孪晶界方向的剪切通道长度,增强了位错储存能力,从而表现出更高的塑性和加工硬化能力。试样经ECAP1P+850℃×1 h空冷处理后晶粒尺寸较小,增加了阻碍位错运动的有效界面,从而同样表现出很高的加工硬化能力。更多还原

【Abstract】 After adopting the deformation of a TWIP steel sample steel(30Mn-3Si-3Al) during equal channel angular pressing(ECAP),a comparative study on microstructures and the mechanical properties of the original state,the one pass pressing state,the ECAP1P+850℃×1h/A.C state and the ECAP1P+1000℃×1h/A.C state was carried out.The results of the experiment reveal that: during the deformation,because of the large amount of obstruction of mutual deformation resistance forces and dislocations of deformation twins in the deformation area,the TWIP steel shows a high degree of work-hardness for processing.After the air-cooling treatment of ECAP1P+1000℃×1h,the plasticity is improved.At the same time,the growing of grains is increased the length of shear channel of dislocation to the direction of the area of twins,and strengthened the storage ability of dislocation,thus shows an even higher degree of plasticity and the work-hardness ability during processing.After the air-cooling treatment of ECAP1P+850℃×1h,because the small grain increases the resistance of the dislocation,the work-hardness ability is improved.更多还原