Site-specific quasi in situ investigation of primary static recrystallization in a low carbon steel
Site-specific quasi in situ investigation of primary static recrystallization in a low carbon steel
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低碳钢初次静态再结晶的定点准原位研究
DOI：
10.1016/j.msea.2019.02.032
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
D. Raabe
中科院分区：
文献类型：
--
作者：
M. Diehl;L. Kertsch;K. Traka;D. Helm;D. Raabe
具有体心立方晶体结构的低合金钢是一种广泛应用于钣金成形的材料。当具有适当的晶体织构和微观结构时，其力学行为的特点是各向同性的平面内流动行为，同时具有低屈服强度。获得这些有利力学性能的决定性加工步骤是冷轧和随后的退火。前者的主要工艺参数是道次数、变形速率和总减薄量，后者的主要工艺参数是加热速率、保温温度和保温时间。冷轧后退火过程中的一次静态再结晶主要改变了材料状态的两个方面：首先，它以低位错密度的小球状晶粒取代了冷轧组织中伸长和严重变形的晶粒；其次，它改变了晶体织构，典型地减少了α-纤维织构成分，增强了γ-纤维织构成分。本文对一种非合金低碳钢的再结晶行为进行了研究。采用一种准原位设置，使特定位置的表征能够获得成核和再结晶过程的局部图像。根据形变结构的核平均取向偏差（KAM）值，可以预测新晶粒消耗的趋势。晶体学分析表明，变形最多的区域要么是a - γ纤维取向，要么属于严重破碎的区域。新晶粒尤其在这些高度变形的区域成核，并往往继承变形组织的取向。
Low-alloyed steels with body-centered cubic crystal structure are a material class that is widely used for sheet metal forming applications. When having an adequate crystallographic texture and microstructure, their mechanical behavior is characterized by an isotropic in-plane flow behavior in combination with a low yield strength. The decisive processing steps for obtaining these beneficial mechanical properties are cold rolling and subsequent annealing. While for the former the number of passes, the deformation rates, and the total thickness reduction are the main processing parameters, the latter is described mainly by the heating rate and the holding temperature and time. Primary static recrystallization during annealing subsequent to the cold rolling process alters mainly two aspects of the material state: It firstly replaces the elongated and heavily deformed grains of the cold rolled microstructure by small, globular grains with low dislocation density and secondly it changes the crystallographic texture insofar as it typically diminishes theα- and strengthens theγ-fiber texture components. In the present work, the recrystallization behavior of a commercial non-alloyed low carbon steel is studied. A quasiin situsetup that enables site-specific characterization is employed to gain a local picture of the nucleation and recrystallization process. From the Kernel Average Misorientation (KAM) values of the deformation structure, the tendency to be consumed by new grains can be predicted. Crystallographic analysis shows that the most deformed regions have either aγ-fiber orientation or belong to heavily fragmented regions. New grains nucleate especially in such highly deformed regions and inherit often the orientation from the deformation microstructure.
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影响因子：
9.4
作者：
Dorner, Dorothee;Zaefferer, Stefan;Raabe, Dierk
通讯作者：
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DOI：
--
发表时间：
1996
期刊：
影响因子：
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作者：
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作者：
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M. Gómez;A. Quispe;S. Medina
影响因子：
1.8
作者：
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M. Barnett;J. Jonas
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DOI：
--
发表时间：
1998
期刊：
影响因子：
--
作者：
A. Miroux;H. Réglé;B. Bacroix
通讯作者：
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