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首页> 美国卫生研究院文献>Materials >Evolution of Grain Interfaces in Annealed Duplex Stainless Steel after Parallel Cross Rolling and Direct Rolling
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Evolution of Grain Interfaces in Annealed Duplex Stainless Steel after Parallel Cross Rolling and Direct Rolling

机译：平行双轧和直轧后退火双相不锈钢晶粒界面的演变

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摘要

Changes in various grain interfaces, including the grain boundary and phase boundary, are a strong indication of microstructural changes, particularly ultra-fined grains achieved by large strain deformation and subsequent annealing. After direct rolling and cross rolling with the same strain of ε = 2, the distributions of the interfaces in annealed UNS S32304 duplex stainless steel were investigated using electron backscatter diffraction (EBSD) in this study. The ferrite experienced continued recovery, and a high density of low-angle grain boundaries (LAGBs) was produced. The percentage and number of twin boundaries (TBs) and LAGBs varied within the austenite. TBs were frequently found within austenite, showing a deviation from the Kurdjumov-Sachs (K-S) orientation relationship (OR) with ferrite matrix. However, LAGBs usually occur in austenite, with the K-S OR in the ferrite matrix. LAGBs were prevalent in the precipitated austenite grains, and therefore a strong texture was introduced in the cross-rolled and annealed samples, in which the precipitated austenite readily maintained the K-S OR in the ferrite matrix. By contrast, more TBs and a less robust texture were found in the precipitated austenite in direct-rolled and annealed samples, deviating from the K-S OR.
机译：包括晶界和相界在内的各种晶界的变化强烈地表明了显微组织的变化，特别是通过大的应变变形和随后的退火而获得的超细晶粒。在相同的ε= 2应变下进行直接轧制和交叉轧制之后，使用电子背散射衍射（EBSD）研究了退火的UNS S32304双相不锈钢中界面的分布。铁素体经历了持续的恢复，并且产生了高密度的低角度晶界（LAGB）。奥氏体中双晶界（TB）和LAGB的百分比和数量不同。在奥氏体中经常发现结核，这表明与铁素体矩阵的库尔德朱莫夫-萨克斯（K-S）取向关系（OR）存在偏差。但是，LAGB通常出现在奥氏体中，而K-S OR出现在铁素体基体中。 LAGBs在析出的奥氏体晶粒中普遍存在，因此在交叉轧制和退火的样品中引入了强烈的织构，其中析出的奥氏体易于在铁素体基体中保持K-S OR。相比之下，在直接轧制和退火后的样品中，与K-S OR有所不同，在沉淀的奥氏体中发现了更多的TB和较不坚固的织构。

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