A synchrotron X-ray diffraction study of non-proportional strain-path effects
A synchrotron X-ray diffraction study of non-proportional strain-path effects
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非比例应变路径效应的同步加速器 X 射线衍射研究
DOI：
10.1016/j.actamat.2016.11.011
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发表时间：
2017
期刊：
影响因子：
9.4
通讯作者：
Collins D
中科院分区：
文献类型：
--
作者：
Collins D
以板材形式使用的常见合金在承受某些多轴应变路径时可以表现出显着的延展性优势。本文结合中岛膨胀测试、十字形样品双轴测试期间的 X 射线衍射和晶体塑性有限元 (CPFE) 建模，研究了多晶铁素体钢的这种效应。当板材承受单轴载荷，然后进行平衡双轴变形时，发现失效应变的最大增益，导致总变形接近平面应变。实现了大约两倍于比例载荷的组合应变。通过原位高能同步加速器衍射评估了非比例加载过程中宏观应变、微应变和织构的演变。结果表明，非比例变形产生的不均匀应变积累强烈依赖于纹理和第一道变形所施加的应变比。实验衍射证据得到了 CPFE 衍生衍射模拟新方法产生的结果的支持。使用与测量的晶格应变发展良好一致的基础上选择的本构定律，CPFE 模型证明了复制实验测量的延展性增益的能力。
Common alloys used in sheet form can display a significant ductility benefit when they are subjected to certain multiaxial strain paths. This effect has been studied here for a polycrystalline ferritic steel using a combination of Nakajima bulge testing, X-ray diffraction during biaxial testing of cruciform samples and crystal plasticity finite element (CPFE) modelling. Greatest gains in strain to failure were found when subjecting sheets to uniaxial loading followed by balanced biaxial deformation, resulting in a total deformation close to plane-strain. A combined strain of approximately double that of proportional loading was achieved. The evolution of macrostrain, microstrain and texture during non-proportional loading were evaluated by in-situ high energy synchrotron diffraction. The results have demonstrated that the inhomogeneous strain accumulation from non-proportional deformation is strongly dependent on texture and the applied strain-ratio of the first deformation pass. Experimental diffraction evidence is supported by results produced by a novel method of CPFE-derived diffraction simulation. Using constitutive laws selected on the basis of good agreement with measured lattice strain development, the CPFE model demonstrated the capability to replicate ductility gains measured experimentally.
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DOI：
10.1007/bf02645615
发表时间：
1973-01-01
期刊：
METALLURGICAL TRANSACTIONS
影响因子：
--
作者：
GHOSH, AK;BACKOFEN, WA
通讯作者：
BACKOFEN, WA
奥氏体不锈钢对 90° 应变路径变化的宏观和晶间应力响应
DOI：
--
发表时间：
2012
期刊：
影响因子：
--
作者：
D. González;J. Kelleher;J. Fonseca;P. Withers
通讯作者：
P. Withers
局部颈缩开始时实验成形极限曲线的评估和应变率敏感性的研究
DOI：
--
发表时间：
2011
期刊：
影响因子：
--
作者：
W. Volk;P. Hora
通讯作者：
P. Hora
DOI：
10.1007/s11661-001-0042-9
发表时间：
2001-10-01
影响因子：
2.8
作者：
Nesterova, EV;Bacroix, B;Teodosiu, C
通讯作者：
Teodosiu, C
影响因子：
9.8
作者：
T. Erinosho;A. Cocks;F. Dunne
通讯作者：
T. Erinosho;A. Cocks;F. Dunne