应变速率对室温下90°等通道转角挤压变形工业纯钛拉伸性能的影响
Effect of Strain Rate on Tensile Properties of Commercial Pure Titanium Processed by ECAP at Room Temperature with a 90° Die
摘 要
采用单向拉伸测试方法, 研究了应变速率(0.001 7, 0.01, 0.1 s-1)对室温下经90°等通道转角挤压变形1道次工业纯钛室温拉伸性能的影响, 并分析了其断口形貌。结果表明: 当应变速率由0.001 7 s-1升至0.1 s-1时, 挤压后工业纯钛的断裂伸长率由17.9%减至14.9%, 抗拉强度由780 MPa增至926 MPa, 应变硬化指数由0.07降低到0.04; 拉伸断口均为韧窝型韧性断口, 且随应变速率的增加韧窝深度变浅。
工业纯钛
应变速率
拉伸性能
equal channel angular pressing (ECAP)
commercial pure titanium
strain rate
property
Abstract
The uniaxial tensile test was applied to investigate the effect of strain rate (0.001 7, 0.01, 0.1 s-1) on the tensile properties and fractography of commercial pure titanium (CP-Ti) fabricated by equal channel angular pressing (ECAP)with one pass deformation at room temperature using a die of 90°. The results show as the strain rate rose from 0.001 7 s-1 to 0.1 s-1, elongation to fracture decreased from 17.9% to 14.9%, and ultimate tensile strength increased from 780 MPa to 926 MPa, and work hardening exponent reduced from 0.07 to 0.04. The fracture surface of CP-Ti exhibited tough fracture of dimple, and dimple became shallow with the increase of strain rate.
中图分类号 TG146.4
所属栏目 试验研究
基金项目 高等学校博士学科点专项科研基金资助项目(20116120110012); 陕西省教育厅专项科研基金资助项目(12JK0430)
收稿日期 2012/10/19
修改稿日期 2013/5/7
网络出版日期
作者单位点击查看
备注刘晓燕(1980-), 女, 内蒙古鄂托克旗人, 讲师, 博士研究生。
引用该论文: LIU Xiao-yan,ZHAO Xi-cheng,YANG Xi-rong,ZHANG Kai,XIE Chen. Effect of Strain Rate on Tensile Properties of Commercial Pure Titanium Processed by ECAP at Room Temperature with a 90° Die[J]. Materials for mechancial engineering, 2013, 37(8): 5～8
刘晓燕,赵西成,杨西荣,张凯,解晨. 应变速率对室温下90°等通道转角挤压变形工业纯钛拉伸性能的影响[J]. 机械工程材料, 2013, 37(8): 5～8
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【2】ZHERNAKOV V S, LATYSH V V, STOLYAROV V V, et al. The developing of nanostructured SPD Ti for structural use[J].Scr Mater, 2001, 44(8/9): 1771-1774.
【3】TORRE F D, LAPOVOK R, SANDLIN J, et al. Microstructures and properties of copper processed by equal channel angular extrusion for 1-16 passes[J].Acta Mater, 2004, 52(16): 4819-4832.
【4】VALIEV R Z, ALEXANDROV I V, ZHU Y T, et al. Paradox of strength and ductility in metals processed by severe plastic deformation[J].J Mater Res, 2002, 17(1): 5-8.
【5】STOLYAROV V V, ZHU Y T, LOWE T C, et al. Microstructure and properties of pure Ti processed by ECAP and cold extrusion[J].Mater Scie Eng A, 2001, 303(1/2): 82-89.
【6】STOLYAROV V V, ZHU Y T, ALEXANDROV I V, et al. Grain refinement and properties of pure Ti processed by warm ECAP and cold rolling[J].Mater Scie Eng A, 2003, 343(1/2): 43-50.
【7】ZHU Y T, KOBOLOV Y R, GRABOVETSKAYA G P, et al. Microstructures and mechanical properties of ultrafine grained Ti foil processed by equal-channel angular pressing and cold rolling[J].J Mater Res, 2003, 18: 1011-1016.
【8】KIM I, KIM J, SHIN D H, et al. Effects of grain size and pressing speed on the deformation mode of commercially pure Ti during equal channel angular pressing[J].Metall Mater Trans A, 2003, 34 (7): 1555-1558.
【9】STOLYAROV V V, ZEIPPER L, MINGLER B, et al. Influence of post-deformation on CP-Ti processed by equal channel angular pressing[J].Mater Scie Eng A, 2008, 476(1/2): 98-105.
【10】CHEN Y J, LI Y J, WALMSLEY J C, et al. Microstructure evolution of commercial pure titanium during equal channel angular pressing[J].Mater Scie Eng A, 2010, 527(3): 789-796.
【11】KANG D H, KIM T W. Mechanical behavior and microstructural evolution of commercially pure titanium in enhanced multi-pass equal channel angular pressing and cold extrusion[J].Materials & Design, 2010, 31: 54-60.
【12】SABIROV I, PEREZ-PRADO M T , MOLINA-ALDAREGUIA J M, et al. Anisotropy of mechanical properties in high-strength ultra-fine-grained pure Ti processed via a complex severe plastic deformation route[J].Scr Mater, 2011, 64(1): 69-72.
【13】ZHAO X C, FU W J, YANG X R, et al. Microstructure and properties of pure titanium processed by equal-channel angular pressing at room temperature[J].Scr Mater, 2008, 59(5): 542-545.
【14】ZHAO X C, YANG X R, LIU X Y, et al. The processing of pure titanium through multiple passes of ECAP at room temperature[J].Mater Scie Eng A, 2010, 527(23): 6335-6339.
【15】ZHANG Y, FIGUEIREDO R B, ALHAJERI S N, et al. Structure and mechanical properties of commercial purity titanium processed by ECAP at room temperature[J].Mater Scie Eng A, 2011, 528(25/26): 7708-7714
【16】DHEDA S S, MOHAMED F A. Effect of initial microstructure on the processing of titanium using equal channel angular pressing[J].Mater Scie Eng A, 2011, 528(28): 8179-8186.
【17】赵西成, 王幸运, 杨西荣, 等. 120模具室温8道次ECAP变形TA1纯钛的组织与性能[J].金属材料与工程, 2011, 40(1): 28-31.
【18】付文杰, 赵西成, 杨西荣, 等.室温ECAP和冷轧复合变形工业纯钛的组织和性能[J].材料研究学报, 2008, 22(3): 303-306.
【19】杨西荣, 赵西成, 付文杰.变形方式对工业纯钛室温ECAP组织及性能影响[J].稀有金属材料与工程, 2009, 38(11): 1910-1915.
【20】JIA D, WANG Y M, RAMESH KT, et al. Deformation behavior and plastic instabilities of ultrafine-grained titanium[J].Appl Phys Lett, 2001, 79 (5): 611-613.
【21】IWAHASHI Y, WANG J T, HORITA Z, et al. Principle of equal-channel angular pressing for the processing of ultra-fine grained materials[J].Scr Mater, 1996, 35 (2): 143-146.
【22】束德林. 工程材料力学性能[M].北京: 机械工业出版社, 2003.
【23】谭树青, 王经涛.金属塑性加工物理基础[M].西安: 陕西科学技术出版社, 1996.
【24】杨觉先.金属塑性变形物理基础[M].北京: 冶金工业出版社, 1988.
【25】吴全兴, 曾泉浦, 张小明, 等.钛加工技术[R].西安: 西北有色金属研究院, 1997.
【26】PARK K T, SHIN D H. Microstructural interpretation of negligible strain-hardening behavior of submicrometer- grained low-carbon steel during tensile deformation[J].Metall Mater Trans A, 2002, 33(3): 705-707.
【27】LOJKOWSKI W. On the Spreading of grain boundary dislocations and its effect on grain boundary properties[J].Acta Metall Mater, 1991, 39(8): 1891-1899.
【28】KO Y G, SHIN D H, PARK K T, et al. An analysis of the strain hardening behavior of ultra-fine grain pure titanium[J].Scr Mater, 2006, 54(10): 1785-1789.
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