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研究了等径通道挤压技术对于一种低碳高锰孪晶诱导塑性变形(TWIP)钢力学性能,微观结构以及织构性能的影响。微拉伸实验结果表明:TWIP钢维氏硬度值,屈服强度和抗拉强度随挤压道次增长不断升高,而塑性则下降。通过EBSD分析,结果表明经等径通道挤压,平均晶粒尺度由原始状态下的199.6μm减小到不足1μm,孪晶比例也随之下降。关于ECAP挤压后的织构演化,EBSD结果表明原始状态下的主导织构为Goss和Brass,而在挤压后,逐渐由一道次的A*1和A*2织构向多道次的B/B·织构过渡。这表明了多道次挤压后材料呈现了更加稳定的微观结构。
The effect of equal channel extrusion technology on mechanical properties, microstructure and texture properties of a low carbon, high manganese twins induced plastic deformation (TWIP) steel was investigated. The microtensile test results show that the Vickers hardness, yield strength and tensile strength of TWIP steel increase with the increase of extrusion pass, while the ductility decreases. By EBSD analysis, the results show that the average grain size decreases from 199.6μm to less than 1μm through the iso-channel, and the twin ratio also decreases. With regard to the texture evolution after ECAP extrusion, the EBSD results show that the dominant texture in the original state is Goss and Brass, and gradually squeezed by a series of A * 1 and A * 2 texture to the multi-pass B / B · Texture transition. This shows that the material after multi-pass extrusion presents a more stable microstructure.