Strain Partitioning of Step Quenched Dual Phase Steels in Tensile Deformation
摘 要
采用亚微米级分辨率的数字图像相关(DIC)方法, 探究了分级淬火得到的马氏体体积分数分别为33.8%和58.3%双相钢在不同拉伸变形量下的应变分配规律。结果表明: 两种双相钢在不同变形量下的微观应变分配规律相似, 应变分布都很不均匀, 且变形量较大时应变分布不均匀性更为显著; 在马氏体体积分数较小的双相钢中, 应变在铁素体和马氏体间分配的不均匀性更显著; 微区内存在应变集中的变形带, 变形带主要分布在铁素体上, 在块状马氏体间的较窄铁素体区域出现的概率比较大; 在马氏体上或相界面处也有少量应变集中的变形带, 马氏体体积分数较小时沿相界面扩展的变形带数量较多; 马氏体体积分数较大时变形带穿过马氏体的概率更大。
Abstract
The strain partitioning behavior of step quenched dual phase steels with martensite volume fraction of 33.8% or 58.3% was studied in different tensile deformation degrees using digital image correlation (DIC) method of sub-micron scale. The results show that the strain partitioning behavior was similar for both dual phase steels in different deformation degrees; the strain distribution was quite inhomogeneous, especially when the deformation degree was increased; the inhomogeneity of strain partitioning behavior between ferrite and martensite was more pronounced for dual phase steel with less martensite. There were deformation bands with intense strain in the micro area, which mainly distributed in ferrite regions, especially in narrow ferrite bands between martensite. There were also few deformation bands in martensite and along the phase interfaces, and the deformation bands along the phase interfaces increased in number when the volume fraction of martensite was small. The probability of deformation bands crossing martensite was larger for dual-phase steel with large volume fraction of martensite.
中图分类号 TG142.1 DOI 10.11973/jxgccl201506009
所属栏目 新材料新工艺
基金项目 国家重点基础研究发展计划项目 (2012CB619600)
收稿日期 2014/4/10
修改稿日期 2015/3/12
网络出版日期
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备注许以阳 (1990—), 男, 山东聊城人, 硕士研究生。
引用该论文: XU Yi-yang,DENG Jie,GE Han-qing,SHEN Yao. Strain Partitioning of Step Quenched Dual Phase Steels in Tensile Deformation[J]. Materials for mechancial engineering, 2015, 39(6): 40~46
许以阳,邓洁,葛涵清,沈耀. 分级淬火热处理双相钢在拉伸变形时的应变分配[J]. 机械工程材料, 2015, 39(6): 40~46
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【2】TASAN C, HOEFNAGELS J, GEERS M. Microstructural banding effects clarified through micrographic digital image correlation[J]. Scripta Materialia, 2010, 62 (11): 835-838.
【3】RAMAZANI A, SCHWEDT A, ARETZ A, et al. Failure initiation in dual-phase steel[J]. Key Engineering Materials, 2014, 586: 67-71.
【4】GHADBEIGI H, PINNA C, CELOTTO S. Failure mechanisms in DP600 steel: Initiation, evolution and fracture[J]. Materials Science and Engineering: A, 2013, 588: 420-431.
【5】RAMAZANI A, SCHWEDT A, ARETZ A, et al. Characterization and modelling of failure initiation in DP steel[J]. Computational Materials Science, 2013, 75: 35-44.
【6】CHOI S H, KIM E, WOO W, et al. The effect of crystallographic orientation on the micromechanical deformation and failure behaviors of DP980 steel during uniaxial tension[J]. International Journal of Plasticity, 2013, 45: 85-102.
【7】KIM E Y, YANG H, HAN S, et al. Effect of initial microstructure on strain-stress partitioning and void formation in DP980 steel during uniaxial tension[J]. Metals and Materials International, 2012, 18 (4): 573-582.
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【9】万妮, 李鹏. 浅谈数字散斑相关测量方法[J]. 山西建筑, 2007, 33 (18): 54-55.
【10】PAN B, QIAN K, XIE H, et al. Two-dimensional digital image correlation for in-plane displacement and strain measurement: a review[J]. Measurement Science and Technology, 2009, 20 (6): 062001(1-17).
【11】KANG J, OSOSKOV Y, EMBURY J D, et al. Digital image correlation studies for microscopic strain distribution and damage in dual phase steels[J]. Scripta Materialia, 2007, 56 (11): 999-1002.
【12】HAN Q, KANG Y, HODGSON P, et al. Quantitative measurement of strain partitioning and slip systems in a dual phase steel[J]. Scripta Materialia, 2013, 69: 13-16.
【13】JOO S H, LEE J K, KOO J M, et al. Method for measuring nanoscale local strain in a dual phase steel using digital image correlation with nanodot patterns[J]. Scripta Materialia, 2012, 68: 245-248.
【14】马鸣图, 吴宝榕. 双相钢: 物理和力学冶金[M]. 北京: 冶金工业出版社, 2009.
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