基于位错密度理论的超高强双相钢DP1000热变形本构模型
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摘要
对超高强双相钢DP1000进行单道次热模拟压缩实验,研究了其在950~1150℃和0.05~10 s~(-1)条件下的热变形行为,分析了变形温度和变形速率对流变应力的影响,建立了基于位错密度理论的热力学本构模型,确定了可表征微观硬化和软化机制的材料特征参数,量化了加工硬化、动态回复和动态再结晶对宏观力学行为的影响。结果表明:超高强双相钢DP1000的热变形应变速率ε?≤0.05 s~(-1)时以动态再结晶软化机制为主,应变速率ε?>0.1 s~(-1)时以动态回复软化机制为主,应变速率0.05 s~(-1)<ε?≤0.1 s~(-1)时由这两种软化机制共同作用。这个本构模型的预测值与实验值具有较高的一致性,能准确预测超高强双相钢DP1000在高温变形条件下的流变应力。
The compression deformation behavior of ultra-high strength dual phase steel(UHSDP1000) was investigated by strain rates from 0.05 s~(-1)to 10 s~(-1)at temperatures from 950°C to 1150°C.The influence of deformation temperature and strain rate on the hot flow curves was analyzed. Then a constitutive model for hot deformation of the steel UHS-DP1000 was established based on the dislocation density theory. The relevant softening mechanism of the steel was revealed in terms of the following two aspects that by low strain rates(lower than 0.05 s~(-1)) at high temperatures the dynamic recrystallization(DRX) softening mechanism was more evident, while by strain rates higher than 0.1 s~(-1)the dynamic recovery(DRV) softening mechanism was dominant. The two softening mechanisms worked simultaneously by strain rates in a range between 0.05 s~(-1)and 0.1 s~(-1). The stress-strain values predicted by thepresent model for the steel UHS-DP1000 are well agreed with those acquired from experiments, which further confirmed that the established constitutive model could give an accurate estimate for the flow stress of high temperature deformation of the steel UHS-DP1000.
The compression deformation behavior of ultra-high strength dual phase steel(UHSDP1000) was investigated by strain rates from 0.05 s~(-1)to 10 s~(-1)at temperatures from 950°C to 1150°C.The influence of deformation temperature and strain rate on the hot flow curves was analyzed. Then a constitutive model for hot deformation of the steel UHS-DP1000 was established based on the dislocation density theory. The relevant softening mechanism of the steel was revealed in terms of the following two aspects that by low strain rates(lower than 0.05 s~(-1)) at high temperatures the dynamic recrystallization(DRX) softening mechanism was more evident, while by strain rates higher than 0.1 s~(-1)the dynamic recovery(DRV) softening mechanism was dominant. The two softening mechanisms worked simultaneously by strain rates in a range between 0.05 s~(-1)and 0.1 s~(-1). The stress-strain values predicted by thepresent model for the steel UHS-DP1000 are well agreed with those acquired from experiments, which further confirmed that the established constitutive model could give an accurate estimate for the flow stress of high temperature deformation of the steel UHS-DP1000.
引文
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[2]Yu W H,Zhou B B,Su J J,et al.Research on the deformation resistance of 600 MPa hot-rolled DP steel[J].China Metallurgy,2012,22(11):21(余万华,周斌斌,苏捷杰等.热轧DP600双相钢变形抗力的研究[J].中国冶金,2012,22(11):21)
[3]Chen J,Li H T,Hu J P,et al.Experimental research on deformation resistance of hot-rolled DP600 dual phase steel[J].Hot Working Technology,2014,43(9):64(陈靖,李宏图,胡建平等.热轧DP600双相钢变形抗力的实验研究[J].热加工工艺,2014,43(9):64)
[4]Pang Q H,Tang D,Zhao Z Z.Micrstructure based model for the stress-strain relationship of hot rolled dual phase steel[J].Chin.J.of Eng.,2015,37(11):1442(庞启航,唐荻,赵征志.热轧双相钢微观应力-应变模型[J].工程科学学报,2015,37(11):1442)
[5]Saeidi N,Ashrafizadeh F,Niroumand B.Development of a new ultrafine grained dual phase steel and examination of the effect of grain size on tensile deformation behavior[J].Mater.Sci.Eng.,A,2014,(599):145
[6]Dai Q F,Song R B,Cai H J,et al.Tensile mechanical behavior of ultra-high strength cold rolled dual phase steel DP1000 at high strain rates[J].Chin.J.Mater.Res.,2013,27(1):25(代启锋,宋仁伯,蔡恒君等.超高强冷轧双相钢DP1000高应变速率下的拉伸性能[J].材料研究学报,2013,27(1):25)
[7]Hosseini H T,Anbarlooie B,Kadkhodapour J.Micromechanics stress-strain behavior prediction of dual phase steel considering plasticity and grain boundaries debonding[J].Mater.Des.,2015,(68):167
[8]Wei X,Fu L M,Liu S C,et al.Deformation behavior of constituent phases and the affected factors in dual-phase steel[J].Chin.J.Mater.Res.,2013,27(6):665(魏兴,付立铭,刘世昌等.双相钢组成相的变形行为及其影响因素[J].材料研究学报,2013,27(6):665)
[9]Wang Z G,Zhao A M,Ye J Y,et al.Microstructure and textural evolution of micro-carbon DP steel during the heating stage of continued annealing process[J].Chin.J.Mater.Res.,2013,27(6):561(汪志刚,赵爱民,叶洁云等.微碳DP钢在连续退火加热段的组织与织构演变[J].材料研究学报,2013,27(6):561)
[10]Dong D Y,Liu C,Wang L,et al.Effect of strain rate on dynamic deformation behavior of DP780 steel[J].Acta Metall.Sin.,2013,49(2):159(董丹阳,刘畅,王磊等.应变速率对DP780钢动态拉伸变形行为的影响[J].金属学报,2013,49(2):159)
[11]Azarbarmas M,Aghaie-Khafri M,Cabrera J M,et al.Dynamic recrystallization mechanisms and twining evolution during hot deformation of Inconel 718[J].Mater.Sci.Eng.A,2016,(678):137
[12]Yang S L,Shen J,Yan X D,et al.Dynamic recrystallization kinetics and nucleation mechanism of Al-Cu-Li alloy based on flow behavior[J].Chin.J.Nonferrous Met.,2016,26(2):365(杨胜利,沈健,闫晓东等.基于Al-Cu-Li合金流变行为的动态再结晶动力学与形核机制[J].中国有色金属学报,2016,26(2):365)
[13]Jiang H T,Zeng S W,Zhao A M,et al.Hot deformation behavior ofβphase containingγ-Ti Al alloy[J].Mater.Sci.Eng.A,2016,(661):160
[14]Chen J,Tang S,Zhou Y L,et al.Microstructure and textural evolution of micro-carbon DP steel during the heating stage of continued annealing process[J].Chin.J.Mater.Res.,2012,26(2):199(陈俊,唐帅,周砚磊等.低碳Q690q ENH高强桥梁钢的动态再结晶行为[J].材料研究学报,2012,26(2):199)
[15]Bi J F,Li Z L,Shan Q,et al.Investigation on high temperature deformation behavior and microstructure evolution of Si-Mn-Cr-B Alloy steel[J].Chin.J.Mater.Res.,2016,30(8):595(毕金凤,李祖来,山泉等.Si-Mn-Cr-B合金钢的高温变形行为及组织演变研究[J].材料研究学报,2016,30(8):595)
[16]Lin Y C,Chen M S,Zhong J.Constitutive modeling for elevated temperature flow behavior of 42Cr Mo steel[J].Comput.Mater.Sci.,2008,(42):470
[17]Ding Z Y,Hu Q D,Zeng L,et al.Hot deformation characteristics of as-cast high-Cr ultra-super-critical rotor steel with columnar grains[J].Int.J.Minerals,Metall.Mater.,2016,23(11):1275
[18]Yu W,Xu L X,Zhang Y,et al.Constitutive equation for high temperature flow stress of 95Cr Mo steel[J].Trans.Mater.Heat Treat.,2015,36(10):262(余伟,许立雄,张昳等.95Cr Mo钢高温流变应力的本构方程[J].材料热处理学报,2015,36(10):262)
[19]Zhou J H,Guan K Z.Theflowstressofalloystructuralsteelsathightemperature andhigh strain rate[J].Acta Metall.Sin.,1986,22(1):123(周纪华,管克智.高温高速下合金结构钢流动应力研究[J].金属学报,1986,22(1):123)
[20]Qi L,Zhao Z Z,Zhao A M.High temperature deformation behavior of X100 pipeline steel[J].J.Wuhan Univ.Sci.Technol.,2012,35(3):178(齐亮,赵征志,赵爱民.X100管线钢的高温变形力学行为[J].武汉科技大学学报,2012,35(3):178)
[21]Wen D X,Lin Y C,Li H B,et al.Hot deformation behavior and processing map of a typical Ni-based superalloy[J].Mater.Sci.Eng.A,2014,(591):183
[22]Mejía I,Reyes Calderón F,Cabrera J M.Modeling the hot flow behavior of a Fe-22Mn-0.41C-1.6Al-1.4Si TWIPsteel microalloyed with Ti,V and Nb[J].Mater.Sci.Eng.A,2015,(644):374
[23]Bergstr?m Y.A dislocation model for the stress-strain behavior of polycrystallineα-Fe with special emphasis on the variation of the densities of mobile and immobile dislocations[J].Mater.Sci.Eng.A,1970,5(4):193
[24]Yoshie A,Fujita T,Fujioka M,et al.Formulation of the Decrease in Dislocation Density of Deformed Austenite Due to Static Recovery and Recrystallization[J].ISIJ Int.,1996,36(4):474
[25]Xu S J,Shi C S,Zhao N Q,et al.Dynamic recrystallization phenomenon in hot-working process by multi-phase-field model[J].Acta Phys.Sin.,2012,61(11):116101(徐树杰,师春生,赵乃勤等.热加工过程中动态再结晶现象的多相场研究[J].物理学报,2012,61(11):116101)
[26]Lin Y C,Chen X.A critical review of experimental results and constitutive descriptions for metals and alloys in hot working[J].Mater.Des.,2011,32(4):1733
[27]Yanagida A,Liu J,Yanagimoto J.Flow curve determination for metal under dynamic recrystallization using inverse analysis[J].Mater.Trans.,2003,44(11):2303
[28]Ryan N D,Mcqueen H J.Dynamic Softening Mechanisms in 304Austenitic Stainless Steel[J].Can.Metall.Q.,1990,29(2):147
[29]Meckingh,Kocksu F.Kinetics of Flow and Strain-Hardening[J].Acta Metallurgical,1981,29(11):1865
[30]Poliak E I,Jonas J J.A One-Parmenter Approach to Determining the Critical Conditions for the Initiation of Dynamic Recrystallization[J].Acta Mater.,1996,44(1):127
[31]Najafizadeh A,Jonas J J.Predicting the critical stress for initiation of dynamic recrystallization[J].ISIJ Int.,2006,46(11):1679
[32]Haghdada N,Martin D,Hodgson P.Physically-based constitutive modelling of hot deformation behavior in a LDX 2101 duplex stainless steel[J].Mater.Des.,2016,(106):420