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研究了TWIP钢(30Mn-3Si-3Al)在等径角挤压冷变形过程中的组织演变。结果表明,1道次变形后,产生大量10~40 nm宽的形变孪晶,同时出现的微观剪切带对孪晶进行了切割。随着道次的增加,孪生系统增多,形变孪晶相互交割。同时剪切带的数量增加,产生相互交错并切割孪晶板条。4道次变形后,组织变成由碎化带和割裂开的孪晶相互交织的变形结构。碎化部分超细晶晶粒尺寸为40~120 nm,而未碎化孪晶板条宽度降至5~20 nm。
The microstructure evolution of TWIP steel (30Mn-3Si-3Al) during the cold deformation of isobaric angle extrusion was investigated. The results show that a large number of deformation twins with a width of 10 ~ 40 nm are produced after one pass of deformation, and the twins are cut by microscopic shear bands at the same time. As the number of passes increased, the number of twin systems increased, and deformation twins delivered each other. At the same time, the number of shear bands increases, resulting in interlacing and cleaving of twin slats. After 4 passes deformation, the structure becomes a deformed structure that is intertwined with the fractured zone and the cleaved twins. The ultrafine grain size of the shredded part is 40-120 nm, while the width of the unbroken twinning strip is reduced to 5-20 nm.