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Microstructure and mechanical properties of AISI 316L steel with an inverse gradient nanostructure fabricated by electro-magnetic induction heating

机译：电磁感应加热制备具有反梯度纳米结构的AISI 316L钢的组织和力学性能

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摘要

In this paper, we proposed an inverse gradient nanograined structure (IGNS) to improve the mechanical behavior of an austenitic stainless steel. Using high strain cold rolling and subsequent ultra-high-frequency electromagnetic induction heating, we successfully fabricated an IGNS layer on AISI 316L stainless steel, within which the grain size exponentially decreases from the micrometer scale in the surface to the nanometer scale in the inner center. Microstructure evolution was systematically characterized by transmission electron microscopy. The uniaxial tensile test result shows a superior strength-ductility synergy in the IGNS sample. It obtained a yield strength of 842 MPa and a uniform elongation of 16%. A linear relationship between yield strength and uniform elongation was exhibited in IGNS samples with different volume fractions. Effects of the IGNS layer on strength and ductility were examined. Additionally, the effect of recrystallized grain distribution on mechanical properties was discussed.
机译：在本文中，我们提出了一种反梯度纳米晶粒结构（IGNS），以改善奥氏体不锈钢的力学性能。使用高应变冷轧和随后的超高频电磁感应加热，我们成功地在AISI 316L不锈钢上制造了IGNS层，其晶粒尺寸从表面的微米级到内部中心的纳米级呈指数减小。通过透射电子显微镜系统地表征了微观结构的演变。单轴拉伸试验结果显示了IGNS样品中优异的强度-延性协同作用。其屈服强度为842 MPa，均匀伸长率为16％。在不同体积分数的IGNS样品中，屈服强度与均匀伸长率之间呈线性关系。研究了IGNS层对强度和延展性的影响。此外，还讨论了再结晶晶粒分布对机械性能的影响。

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