徐永波
,
阳华杰
,
Marc Andre Meyers
材料研究学报
本文是作者对背散射电子衍射技术在高应变率态载荷下诱发的几种晶体(包括FE-Cr-Ni单晶,304不锈钢和纳米铜)变形结构演化的最新研究结果,以及对相关研究进展的简要评述.具体内容包括:(1)进一步辨认剪切带中再结晶现象,澄清长期来学者们对该问题看法上的分歧;(2)采用Meyers等提出的结构演化模型对再结晶予以合理的解释;(3)在实验基础上,根据位错动力学理论,对局部化过程中再结晶的晶粒生长予以定量描述,其结果与实验事实吻合.
关键词:
材料科学基础学科
,
EBSD
,
高应变率
,
亚结构
,
剪切带
,
动态再结晶
D. Ferguon
,
W. N. Chen and H. Ferguson (Dynamic Systems Inc. Poestenkill
,
NY 12140
,
USA)
金属学报(英文版)
Ultrafine grain size is often achieved by severe plastic deformation. A few techniques have been devel- oped to achieve severe plastic deformation,such as equal channel angular (ECA ) processing, torsion, and accumulative roll bonding (ARB) techmpues. This paper will introduce a moftiaxis deformation technique which can achieve essentially unlimited strain with constant deformation volume. The mul- tiaxis deformation can be fully restrained or unrestrained.The bulk volume of a multiaxis restraint compression specimen can be easily machined into mechanical testing specimens for mechanical property measurement and other studies.
关键词:
ultrafine grain
,
null
,
null
徐永波阳华杰MarcAndreMeyers
材料研究学报
本文是作者对背散射电子衍射技术在高应变率态载荷下诱发的几种晶体(包括Fe----Cr----Ni单晶、304不锈钢和纳米铜)变形结构演化的最新研究结果, 以及对相关研究进展的简要评述. 具体内容包括: (1)进一步辨认剪切带中再结晶现象, 澄清长期来学者们对该问题看法上的分歧; (2)采用Meyers等提出的结构演化模型对再结晶予以合理的解释; (3)在实验基础上, 根据位错动力学理论, 对局部化过程中再结晶的晶粒生长予以定量描述, 其结果与实验事实吻合.
关键词:
材料科学基础学科
,
EBSD
,
high–strain rate
,
substructures/misorientation, shear bands
,
dynamic–recrystallization
,
null
岳重祥
,
张立文
,
廖舒纶
,
裴继斌
,
高惠菊
,
贾元伟
,
廉晓洁
机械工程材料
用Gleeble-3800型热模拟试验机研究了不同加热温度和保温时间对CCr15钢奥氏体晶粒的长大影响,得到了描述GCr15钢奥氏体晶粒长大规律的数学模型;井将该模型写入Marc的子程序,利用大型商业有限元软件Marc模拟了加热保温过程申GCr15钢奥氏体晶粒的长大过程.结果表明:晶粒长大的模拟结果与试验结果基本吻合.
关键词:
GCr15钢
,
奥氏体晶粒
,
有限元模拟
J.S. Ye
,
Z.R. Ye
,
A. Yang
金属学报(英文版)
A modified temperature-phase transformation-stress coupled 3D non-linear mathemat-ical model and a series of subroutines on the non-liner MARC (MARC Analysis Re-search Corporation) are developed. Then this modified model has been utilized to simu-late the heat treatment processes of 280 connecting rod of 16V280ZJ diesel locomotive.The simulation results are basically in agreement with the experiments, which testifythat the mathematical model and method are feasible. In addition, the simulationcan not only obtain the transient temperature and microstructure of heat treatmentprocess, but also provide a sound scientific basis for the heat treatment workers.
关键词:
non-linear
,
null
,
null
,
null
邹勇
,
张希俊
,
郭华
,
邓勇
金属世界
doi:10.3969/j.issn.1000-6826.2008.01.005
为了解决H型钢轧制缺陷问题,优化工艺方案,借助于有限元分析软件MSC.Marc2003,建立H型钢的轧制模型,模拟轧制过程,并分析了轧件的变形和金属流动情况和翼缘的等效总应变的分布.其模拟结果与实测数据基本吻合.
关键词:
H型钢
,
万能轧制
,
数值模拟
M. Zhao
,
G. Zhang
,
K.S. Zhang
金属学报(英文版)
By combining the Bodner-Partom constitutive model and equivalent stress function,finite element methods and program on analyzing non-elastic deformation and stressfor thermal viscoplastic material are studied in this paper, and it's the first timethat this material model is used in a kind of engineering software-MARC. Thermalviscoplastic behavior of high temperature alloy GH536 specimen with gap is analyzedby this program. The research results show it is feasible to analyze thermal viscoplasticbehavior of specimen or structure by applying B-P model.
关键词:
effective stress function(ESF)
,
null
J.G. Yang
,
H.Y. Fang
,
C.L. Fan
,
Z. Luo
,
X.Z. Hou
,
null
金属学报(英文版)
There is a cyclical aperture at a certain part of the fiberglass reinforced plastic compound pipeline with a stainless steel pipe as a liner, which becomes the weakness of the conduit. The field of stress and strain of the aperture was investigated using the nonliner finite element code Marc. The results of the finite element analysis showed that there were concentrations of stress and strain in the layer of stainless steel at the part of the pipeline where the aperture existed. The method to solve these problems was also discussed.
关键词:
compound pipeline
,
null
,
null
