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Dependence of Deformation Twinning on Grain Orientation and Texture Evolution of High Manganese TWIP Steels at Different Deformation Temperatures

FANG Xiu-hui , YANG Ping , LU Fa-yun , MENG Li

Mechanical properties, microstructure and texture evolution were studied in two tensile-deformed high manganese TWIP steels at different temperatures. Special attention was paid to the effects of deformation temperature and grain orientation on twinning behavior. The results showed that, at -70 ℃ and at room temperature, both twins and hexagonal martensite were found in a lower manganese steel of 26Mn. With deformation temperature rising, twins became less and they disappeared at 500 ℃. Strong <111> texture appeared at 300 ℃, while it weakened at 500 ℃ due to the low strain rate and higher stacking fault energy. EBSD measurement revealed the dependence of deformation twinning on grain orientation at all test temperatures.

关键词: high manganese steel , warm deformation , TWIP effect , texture

温度对中碳钢淬火组织塑性变形力学行为的影响

周继锋，，高聿为，荆天辅

物理测试

利用Gleeble3500热力模拟试验机对中碳钢M和P+F组织的温加工流变应力在不同的变形参数条件下进行了对比研究。结果表明：存在临界温度和临界应变量，使M组织的流变应力等于和低于F+P组织；应变速率()为0.01 s-1时，650~700 ℃压缩，M和F+P的流变行为近于一致，M组织的加工软化作用都大于F+P组织，二者的σ - ε曲线存在交点，交点所对应的ε值为临界应变量。

关键词: 马氏体 , warm deformation , flow stress , critical strain , critical temperature

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Dependence of Deformation Twinning on Grain Orientation and Texture Evolution of High Manganese TWIP Steels at Different Deformation Temperatures

温度对中碳钢淬火组织塑性变形力学行为的影响

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