The effect of deformation texture on the thermal stability of UFG HSLA steel

The effect of deformation texture on the thermal stability of UFG HSLA steel
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变形织构对UFG HSLA钢热稳定性的影响

DOI:
10.1007/s10853-012-6518-8
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发表时间:
2012
影响因子:
4.5
通讯作者:
Enrico
Enrico
中科院分区:
材料科学3区
文献类型:
--
作者:
Bruder;Enrico

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经过剧烈塑性变形处理的超细晶金属的微观结构远离热力学平衡,容易发生粗化过程。理论和实验研究表明,在具有高堆垛层错能的UFG金属中,对不连续晶粒生长的稳定性强烈依赖于大角度晶界(HAGB)的分数。这意味着如果HAGB的分数超过一定水平,则不会发生不连续的晶粒生长。本工作的重点是强变形织构的铁素体钢中的UFG组织的热稳定性的影响,通过线性分流处理。它表明,预期的热稳定性和分数的HAGB之间的相关性是有效的中等织构强度,而强的变形织构促进不连续的晶粒生长,尽管高分数的HAGB。EBSD测量结果表明,这种行为是由于应变引起的晶界迁移造成的渐进取向钉扎效应与正在进行的晶粒生长。因此,大部分的HAGB转化为低迁移率的小角度晶界(LAGB)。因此,具有大部分LAGB的微结构演变为不稳定的不连续晶粒生长。
The microstructures of ultrafine grained (UFG) metals processed by severe plastic deformation are far from the thermodynamic equilibrium thus being prone to undergo coarsening processes. Theoretical and experimental investigations revealed that the stability against discontinuous grain growth in UFG metals with high stacking fault energy strongly depends on the fraction of high angle grain boundaries (HAGBs). This means that discontinuous grain growth does not occur if the fraction of HAGBs exceeds a certain level. The present work focuses on the impact of strong deformation textures on the thermal stability of UFG microstructures in a ferritic steel processed by linear flow splitting. It shows that the expected correlation between thermal stability and fraction of HAGBs is valid up to moderate texture intensities, whereas a strong deformation texture promotes discontinuous grain growth in spite of a high fraction of HAGBs. EBSD measurements reveal that this behavior is attributed to a strain-induced grain boundary migration causing a progressive orientation pinning effect with ongoing grain growth. Thereby, a large fraction of HAGBs is transformed into low angle grain boundaries (LAGBs) with low mobility. Consequently, a microstructure with a majority of LAGBs evolves being unstable against discontinuous grain growth.
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