高志刚,郭鸿镇,苗小浦,姚泽坤

• 1:西北工业大学材料学院

摘要(Abstract)：

基于位错演化规律量化研究了高温变形过程中的加工硬化行为。通过分析Kocks-Mecking和Estrin-Mecking模型在高温变形加工硬化阶段的适用性,发现两种演化模型在动态软化临界条件处发生转换。通过不同变形条件下TC18钛合金热模拟压缩实验,分析不同参数条件下3个硬化阶段的变化规律。整合Kocks-Mecking和Estrin-Mecking模型,研究高温变形加工硬化阶段硬化率对流变应力的响应机制。根据位错增殖系数特点,分析低应力区应力稳态波动的原因及随变形条件不同而出现的变化规律。并由模型中的位错湮灭系数来量化硬化率变化对变形参数的依赖。最后根据高温变形硬化软化的并发性,结合两种演化模型研究高温变形加工硬化行为的阶段性特点。

关键词(KeyWords)： 加工硬化;高温变形;位错演变;钛合金

Abstract:

Keywords:

基金项目(Foundation): 国家高档数控机床与基础制造装备专项(2012ZX04010081)

作者(Author): 高志刚,郭鸿镇,苗小浦,姚泽坤

DOI: 10.13289/j.issn.1009-6264.2015.s2.041

参考文献(References)：

• [1]Gottstein G,Kocks U F.Dynamic recrystalization and dynamic recovery in(111)single-crystals of nickel and copper[J].Acta Metallurgica,1983,31(1):175-188.
• [2]Galiyev A,Kaibyshev R,Gottstein G.Correlation of plastic deformation and dynamic recrystallization in magnesium alloy ZK60[J].Acta Materialia,2001,49(7):1199-1207.
• [3]梁后权,郭鸿镇,宁永权,等.基于软化机制的TC18钛合金本构关系研究[J].金属学报,2014,50(7):871-878.LIANG Hou-quan,GUO Hong-zhen,NING Yong-quan,et al.Analysis on the constitutive relationship of TC18 titanium alloy based on the softening mechanism[J].Acta Metallurgica Sinica,2014,50(7):871-878.
• [4]李德军,冯耀荣,刘强,等.Fe-25Mn-3Al TWIP钢等温压缩的变形行为[J].材料热处理学报,2014,35(4):111-115.LI De-jun,FENG Yao-rong,LIU Qiang,et al.Hot deformation behavior of Fe-25Mn-3Al TWIP steel during hot compression[J].Transactions of Materials and Heat Treatment,2014,35(4):111-115.
• [5]陈永禄,傅高升,陈文哲,等.均匀化退火对Al-1Mn-1Mg合金高温压缩流变应力的影响[J].材料热处理学报,2008,29(2):103-107.CHEN Yong-lu,FU Gao-sheng,CHEN Wen-zhe,et al.Influence of homogenization on flow stress of Al-1Mn-1Mg alloy during hot compression deformation[J].Transactions of Materials and Heat Treatment,2008,29(2):103-107.
• [6]Mecking H,Kocks U F.Kinetics of flow and strain-hardening[J].Acta Metallurgica,1981,29(11):1865-1875.
• [7]Estrin Y,Mecking H.A unified phenomenological description of work-hardening and creep based on one-parameter models[J].Acta Metallurgica,1984,32(1):57-70.
• [8]Poliak E I,Jonas J J.A one-parameter approach to determining the critical conditions for the initiation of dynamic recrystallization[J].Acta Materialia,1996,44(1):127-136.
• [9]Jorge A M,Regone W,Balancin O.Effect of competing hardening and softening mechanisms on the flow stress curve modeling of ultra-low carbon steel at high temperatures[J].Journal of Materials Processing Technology,2003,142(2):415-421.
• [10]WEN D X,LIN Y C,CHEN J,et al.Work-hardening behaviors of typical solution-treated and aged Ni-based superalloys during hot deformation[J].Journal of Alloys and Compounds,2015,618(1):372-379.
• [11]ZHANG W F,LI X L,SHA W,et al.Hot deformation characteristics of a nitride strengthened martensitic heat resistant steel[J].Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2014,590(1):199-208.
• [12]Moiseyer V N.Titanium Alloys-Russian Aircraft and Aerospace Applications[M].London:Taylor&Francis Group,2005.
• [13]权浩,邱克辉,黄德明,等.热处理对TC18钛合金组织的影响[J].材料热处理学报,2014,35(6):71-74.QUAN Hao,QIU Ke-hui,HUANG De-ming,et al.Effect of heat treatment on microstructure of TC18 alloy[J].Transactions of Materials and Heat Treatment,2014,35(6):71-74.
• [14]Picu R C,Majorell A.Mechanical behavior of Ti-6Al-4V at high and moderate temperatures-PartⅡ:constitutive modeling[J].Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2002,326(2):306-316.
• [15]Bergstro Y.A dislocation model for stress-strain behaviour of polycrystalline alpha-fe with special emphasis on variation of densities of mobile and immobile dislocations[J].Materials Science and Engineering,1970,5(4):193.
• [16]Momeni A,Ebrahimi G R,Jahazi M,et al.Microstructure evolution at the onset of discontinuous dynamic recrystallization:A physics-based model of subgrain critical size[J].Journal of Alloys and Compounds,2014,587(2):199-210.
• [17]Beyerlin I J,Tune C N.A dislocation-based constitutive law for pure Zr including temperature effects[J].International Journal of Plasticity,2008,24(5):867-895.
• [18]Dieter G E.Mechanical Metallurgy[M].New York:Mc Graw-Hill Science/Engineering/Math,1986.
• [19]余勇,潘晓霞,谢若泽,等.孪生诱发塑性对V-5Cr-5Ti合金应变硬化行为的影响[J].力学学报,2012,44(2):334-341.YU Yong,PAN Xiao-xia,XIE Ruo-ze,et al.Study of twip effect on strain hardening behavior in V-5Cr-5Ti alloy[J].Chinese Journal of Theoretical and Applied Mechanics,2012,44(2):334-341.
• [20]贾斌,彭艳.铌微合金钢高温变形的本构关系[J].金属学报,2011,47(4):507-512.JIA Bin,PENG Yan.Constitutive relationships of Nb microalloyed steel during high temperature deformation[J].Acta Metallurgica Sinica,2011,47(4):507-512.
• [21]Humphreys F J,Hatherly M.Recrystallization and related annealing phenomena-Second Edition[M].Oxford:Elsevier Ltd,2004.
• [22]Klepaczko J R.Physical-state variables-the key to constitutive modeling in dynamic plasticity[J].Nuclear Engineering and Design,1991,127(1):103-115.
• [23]Murty,Svsn,Sarma,et al.On the evaluation of efficiency parameters in processing maps[J].Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,1997,28(7):1581-1582.
• [24]PENG Xiao-na,GUO Hong-zhen,SHI Zhi-feng,et al.Study on the hot deformation behavior of TC4-DT alloy with equiaxed alpha plus beta starting structure based on processing map[J].Materials Science and Engineering A,2014,605(5):80-88.

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