Hardening and softening mechanisms of pearlitic steel wire under torsion

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	Hardening and softening mechanisms of pearlitic steel wire under torsion
	T. Z. Zhao; S. H. Zhang; G. L. Zhang; H. W. Song; M. Cheng
	2014
发表期刊	Materials & Design
ISSN	0261-3069
卷号	59 页码:397-405
摘要	The mechanical behaviors and microstructure evolution of pearlitic steel wires under monotonic shear deformation have been investigated by a torsion test and a number of electron microscopy techniques including scanning electron microscopy (SEM) and transmission electron microscopy (TEM), with an aim to reveal the softening and hardening mechanisms of a randomly oriented pearlitic structure during a monotonic stain path. Significantly different from the remarkable strain hardening in cold wire drawing, the strain hardening rate during torsion drops to zero quickly after a short hardening stage. The microstructure observations indicate that the inter-lamellar spacing (ILS) decreases and the dislocations accumulate with strain, which leads to hardening of the material. Meanwhile, when the strain is larger than 0.154, the enhancement of dynamic recovery, shear bands (SBs) and cementite fragmentations results in the softening and balances the strain hardening. A microstructure based analytical flow stress model with considering the influence of ILS on the mean free path of dislocations and the softening caused by SBs and cementite fragmentations, has been established and the predicted flow shear curve meets well with the measured curve in the torsion test. (C) 2014 Elsevier Ltd. All rights reserved.
部门归属	[zhao, tian-zhang ; zhang, shi-hong ; song, hong-wu ; cheng, ming] chinese acad sci, inst met res, shenyang 110016, peoples r china. [zhang, guang-liang] taizhou univ, sch mech engn, taizhou 318000, peoples r china. ; zhang, sh (reprint author), 72 wenhua rd, shenyang 110016, peoples r china. ; shzhang@imr.ac.cn
关键词	Pearlitic Steel Wire Hardening Softening Torsion Cold-drawn Microstructure Evolution Plastic-deformation Tensile-strength Large Strains Cementite Decomposition Single
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/72977
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	T. Z. Zhao,S. H. Zhang,G. L. Zhang,et al. Hardening and softening mechanisms of pearlitic steel wire under torsion[J]. Materials & Design,2014,59:397-405.
APA	T. Z. Zhao,S. H. Zhang,G. L. Zhang,H. W. Song,&M. Cheng.(2014).Hardening and softening mechanisms of pearlitic steel wire under torsion.Materials & Design,59,397-405.
MLA	T. Z. Zhao,et al."Hardening and softening mechanisms of pearlitic steel wire under torsion".Materials & Design 59(2014):397-405.