Nanostructurization assisted by twinning during equal channel angular pressing of metastable 316L stainless steel
Nanostructurization assisted by twinning during equal channel angular pressing of metastable 316L stainless steel
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DOI：
10.1007/s10853-011-5303-4
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发表时间：
2011-02
影响因子：
4.5
通讯作者：
H. Ueno;K. Kakihata;Y. Kaneko;S. Hashimoto;A. Vinogradov
中科院分区：
文献类型：
--
作者：
H. Ueno;K. Kakihata;Y. Kaneko;S. Hashimoto;A. Vinogradov
在250 °C至室温的不同温度下，通过等通道转角挤压（ECAP）将常规SUS 316L低碳不锈钢加工至等于2、4、6或8的等效剪切应变。本研究的目的是通过纳米结构的形成，包括孪晶和/或应变诱导相变，获得对“强度-延展性”组合的额外控制。通过透射电子显微镜、X射线衍射和电子背散射衍射（EBSD）技术检查所得的显微结构。观察到大量的结构细化到纳米级，同时拉伸屈服和极限拉伸应力显著增强，均超过1GPa。据报道，在局部塑性流动过程中具有相当大的抗断裂能力，在拉伸时具有相当好的断裂伸长率。
A conventional SUS 316L low carbon stainless steel has been processed by Equal channel angular pressing (ECAP) to the equivalent shear strain equal to 2, 4, 6 or 8 at different temperatures ranging from 250 °C to room temperature. The aim of this study is to gain extra control over the “strength-ductility” combination via nanostructure formation, involving twinning and/or strain-induced phase transformation. The resultant microstructure is examined by transmission electron microscopy, X-ray diffraction and electron back scattered diffraction (EBSD) techniques. Substantial structure refinement down to nanoscale is observed in parallel with significant enhancement of tensile yield and ultimate tensile stress, both exceeding 1GPa. A considerable resistance to fracture during localized plastic flow and a fairly good elongation to fracture in tension is reported.