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首页> 外文期刊>ISIJ international >Fabrication of Ultrafine Grained Ferrite/Martensite Dual Phase Steel by Severe Plastic Deformation
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Fabrication of Ultrafine Grained Ferrite/Martensite Dual Phase Steel by Severe Plastic Deformation

机译：严重塑性变形制备超细晶粒铁素体/马氏体双相钢

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摘要

Processing of ultrafine grained ferrite/martensite dual phase (UFG F/M DP) steel by equal channel angular pressing (ECAP) and subsequent intercritical annealing was described in detail. Along with strain gradient plasticity concept in which an introduction of a high density of geometrically necessary, dislocations attributes to enhance strain hardenability, the aim of the present study was fabrication of UFG F/M DP steel exhibiting extensive strain hardenability, which other UFG materials hardly exhibit, in addition to ultrahigh strength and good uniform elongation. By selecting the optimum ECAP and intercritical annealing conditions, it was possible to fabricate UFG F/M DP steel in which isolated UFG martensite islands were uniformly embedded into UFG ferrite matrix. The formation of such a unique microstructure under the present processing conditions was discussed in terms of microstructural evolution during ECAP. Room temperature tensile properties of UFG F/M DP steel were superior to those of coarse grained counterpart. More importantly, in spite of an UFG structure, the present UFG F/M DP steel exhibited extensive strain hardenability from the onset of plastic deformation in association with grain size independent strain gradient plasticity, unlike other UFG materials.
机译：详细介绍了通过等通道角压（ECAP）处理超细晶粒铁素体/马氏体双相（UFG F / M DP）钢和随后的临界退火工艺。伴随着应变梯度可塑性的概念，其中引入了几何上的高密度，位错可增强应变淬透性，本研究的目的是制造具有广泛应变淬透性的UFG F / M DP钢，而其他UFG材料几乎没有除具有超高强度和良好的均匀伸长率外，还具有良好的显示性。通过选择最佳的ECAP和临界退火条件，可以制造UFG F / M DP钢，其中隔离的UFG马氏体岛均匀地嵌入UFG铁素体基体中。就当前的加工条件下这种独特的微观结构的形成，就ECAP期间的微观结构演变进行了讨论。 UFG F / M DP钢的室温抗拉性能优于粗粒对等钢。更重要的是，尽管具有UFG结构，但是与其他UFG材料不同，本发明的UFG F / M DP钢从塑性变形的开始与晶粒尺寸无关的应变梯度可塑性表现出广泛的应变硬化性。

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