Abstract

Small angle neutron scattering was applied to steel produced by rolling with shear (RS) technology and compared to samples produced by standard technology (ST). Based on small angle neutron scattering measurements the morphology of the grains and pores of RS steels were compared to those of the ST steels. The scattering in small scattering vector region showed anisotropy, attributed to the elongation of the pores; the pearlite lamellae distances along and perpendicular to the rolling directions differed by a factor of 1.5. The results of the Small angle neutron scattering measurements were in accordance with the electrical characteristics of the specimens. They showed smaller and less anisotropic average sizes of the cracks and nanopores for the RS samples than for the ST rods. This confirms the dynamic healing of the nanosized defects during the cold drawing of the RS rods. This fundamental result shows that during severe plastic deformation a cyclic process of nucleation and healing of the nanovoids took place. However, during the standard deformation process only nucleation of the nanovoids is present.

Graphic abstract

中文翻译：

---

低碳钢剪切剪切冷拉后纳米结构的小角中子散射研究

摘要

小角中子散射应用于通过剪切（RS）技术轧制生产的钢，并与通过标准技术（ST）生产的样品进行比较。基于小角度中子散射测量，将RS钢与ST钢的晶粒和孔的形态进行了比较。小散射矢量区域的散射表现出各向异性，这归因于孔的伸长。沿和垂直于轧制方向的珠光体薄片距离相差1.5倍。小角中子散射测量的结果与样品的电气特性一致。他们显示出与ST棒相比，RS样品的裂纹和纳米孔的各向异性平均尺寸更小且更少。这证实了在RS棒的冷拔过程中纳米尺寸缺陷的动态修复。该基本结果表明，在严重的塑性变形过程中，发生了纳米空隙的成核和愈合的循环过程。然而，在标准变形过程中，仅存在纳米空隙的成核。

图形摘要