梯度变形加工改善低碳钢的力学性能

Improving the Mechanical Properties of Low-carbon Steel by a Graded Pre-torsion Deformation

文中研究了经过非均匀梯度预扭转和均匀预拉伸处理的低碳钢的组织结构和力学性能。实验结果表明,预扭转和预拉伸都能有效地提高低碳钢的强度,但在延性和韧性方面有所损失。然而,梯度预扭转处理的试样比预拉伸的试样具有更好的强度-延展性-韧性协同效应。这种综合力学性能的提高是由于梯度组织的形成,即位错密度随着距试样表面深度的减小而逐渐增大。本研究为提高金属材料的力学性能提供了一种梯度塑性变形的策略。

The microstructure and mechanical properties of low carbon steel treated with non-uniform gradient pre torsion and uniform pre tension were studied in the article.The experimental results show that both pre twisting and pre stretching can effectively improve the strength of low-carbon steel,but there is a loss in ductility and toughness.However,the samples treated with gradient pre torsion have better synergistic effects of strength ductility toughness than those pre stretched.The improvement of comprehensive mechanical properties is due to the formation of gradient structure,which means that the dislocation density gradually increases with the decrease of depth from the sample surface.This study provides a strategy for improving the mechanical properties of metal materials through gradient plastic deformation.