不同生产工艺的500 MPa抗震钢筋高应变低周疲劳性能分析
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摘要
为研究不同生产工艺的500 MPa钢筋在地震载荷下的抗震性能,通过控制总应变幅恒定,分别对直径为?20 mm未加工的HRB500余热处理(QST)和钒氮微合金化(VNM)热轧带肋钢筋进行高应变低周疲劳试验。采用Hollomon和Coffin-Manson公式拟合疲劳数据,得到新的钢筋抗震性能评估模型即循环韧度。结果表明:500VNM钢筋的应变为3.5%,其在各应变范围下的疲劳寿命均大于500QST,且循环韧度比500QST大约16%,这是其表层回火马氏体中二次裂纹在循环载荷下大量萌生并快速扩展造成的。钒氮微合金化钢筋循环韧度相对较高,在1%～4%循环应变范围内的滞后环面积均较大,且疲劳断口出现密集且较深的轮胎花样,说明在循环过程中消耗了大量的塑性变形功,V(C,N)纳米颗粒阻挡裂纹扩展使其钝化,避免了应力集中以及应变局部化现象的产生,使钢筋具有更高的抗震能力。
The paper studies the anti-seismic performance of 500 MPa rebars made with different production techniques.With the total strain amplitude constant,the quenched and self-temper heat treatment(QST) was done on the unprocessed HRB500 with a diameter of 20 mm and the high strain low cycle fatigue test was conducted on the V-N micro-alloyed(VNM) hot rolled ribbed bar.The fatigue life data were fitted by Coffin-Manson and Hollomon formula,and a new anti-seismic performance prediction model named cyclic toughness was proposed.The results show that,in addition to 3.5% strain,the fatigue life of 500 VNM under each strain range is longer than that of 500 QST.Its cyclic toughness is 16% greater than that of 500 QST.This is because the secondary cracks in the surface crack of tempered martensite grew in large amounts and expanded quickly under cyclic loading.However,the cyclic toughness of nitrogen and vanadium micro-alloyed rebars is greater.Cyclic hysteresis loop area within from 1% to 4% cyclic strain range is larger.Additionally,dense and deep tire patterns appear in the fatigue fracture.This demonstrates that a large amount of plastic deformation work was consumed in the fatigue process,and V(C,N) nano-particles blocked crack expansion and caused crack blunting,which avoids stress concentration and strain localization,reinforcing rebars' seismic resistance.
The paper studies the anti-seismic performance of 500 MPa rebars made with different production techniques.With the total strain amplitude constant,the quenched and self-temper heat treatment(QST) was done on the unprocessed HRB500 with a diameter of 20 mm and the high strain low cycle fatigue test was conducted on the V-N micro-alloyed(VNM) hot rolled ribbed bar.The fatigue life data were fitted by Coffin-Manson and Hollomon formula,and a new anti-seismic performance prediction model named cyclic toughness was proposed.The results show that,in addition to 3.5% strain,the fatigue life of 500 VNM under each strain range is longer than that of 500 QST.Its cyclic toughness is 16% greater than that of 500 QST.This is because the secondary cracks in the surface crack of tempered martensite grew in large amounts and expanded quickly under cyclic loading.However,the cyclic toughness of nitrogen and vanadium micro-alloyed rebars is greater.Cyclic hysteresis loop area within from 1% to 4% cyclic strain range is larger.Additionally,dense and deep tire patterns appear in the fatigue fracture.This demonstrates that a large amount of plastic deformation work was consumed in the fatigue process,and V(C,N) nano-particles blocked crack expansion and caused crack blunting,which avoids stress concentration and strain localization,reinforcing rebars' seismic resistance.
引文
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[13] TARTAGLIA J M,HAYRYNEN K L.A Comparison of Fatigue Properties of Austempered Versus Quenched and Tempered 4340 Steel[J].Journal of Materials Engineering and Performance,2012,21(6):1008.
[14] QUISPE A,MEDINA S F,GóMEZ M.Influence of Austenite Grain Size on Recrystallisation-Precipitation Interaction in a V-Microalloyed Steel[J].Materials Science and Engineering:A,2007,447(1/2):11.
[15] SAKIN R,IRFAN A.Statistical Analysis of Bending Fatigue Life Data Using Weibull Distribution in Glass-fiber Reinforced Polyester Composites[J].Materials & Design,2008,29(6):1170.
[16] 吕煜坤,盛光敏,黄振华.V-N 微合金化抗震钢筋铁素体中 V(C,N)析出行为分析[J].材料工程,2014(11):43.LYU Yukun,SHENG Guangmin,HUANG Zhenhua.Analysis on V(C,N) Precipitated Behaviors in Ferrite of V-N Microalloyed Anti-seismic Rebars[J].Materials Engineering,2014(11):43.(in Chinese)
[17] LV Y K,SHENG G M,HUANG Z H.High Strain and Low Cycle Fatigue Behaviors of Rebars Produced by QST and V-N Microalloying Technology[J].Construction and Building Materials,2013,48:67.
[2] SHENG G M,GONG S H.Investigation of Low Cycle Fatigue Behavior of Building Structural Steels Under Earthquake Loading[J].Acta Metallurgica Sinica(English Letters),1997,10(1):51.
[3] APOSTOLOPOULOS C A,RODOPOULOS C A.Inelastic Cyclic Behaviour of As-received and Pre-corroded S500s Tempcore Steel Reinforcement[J].International Journal of Structural Integrity,2010,1(1):52.
[4] KAMAYA M.Fatigue Properties of 316 Stainless Steel and Its Failure Due to Internal Cracks in Low-cycle and Extremely Low-cycle Fatigue Regimes[J].International Journal of Fatigue,2010,32(7):1081.
[5] PAUL S K,RANAP K,DAS D,et al.High and Low Cycle Fatigue Performance Comparison Between Micro-alloyed and TMT Rebar[J].Construction and Building Materials,2014,54:170.
[6] 杨雨晴,王庆娟,杜忠泽,等.高强抗震钢筋的研究现状[J].材料导报A(综述篇),2015,29(10):101.YANG Yuqing,WANG Qingjuan,DU Zhongze,etal.Research Status of High-strength Aseismic Reinforcement Steel Bars[J].Materials Review A(Overview),2015,29(10):101.(in Chinese)
[7] MAUGIS P,GOUNé M.Kinetics of Vanadium Carbonitride Precipitation in Steel:A Computer Model[J].Acta Materialia,2005,53(12):3359.
[8] DUTTA B,PALMIERE E J,SELLARS C M.Modeling the Kinetics of Strain Induced Precipitation in Nb Microalloyed Steels[J].Acta Materialia,2001,49(5):785.
[9] 杨才福,张永权.钒氮微合金化技术在HSLA 钢中的应用[J].钢铁,2002,37(11):42.YANG Caifu,ZHANG Yongquan.Application of V-N MicroAlloying Technology in HSLA Steels[J].Iron and Steel,2002,37(11):42.(in Chinese)
[10] 盛光敏,吕煜坤,黄振华.细晶化和余热处理抗震钢筋的高应变低周疲劳行为分析[J].功能材料,2014,45(15):15124.SHENG Guangmin,LYU Yukun,HUANG Zhenhua.Analysis on the High Strain and Low Cycle Fatigue Behaviors of Rebar Between the Grain Refinement and Tempcore Technology[J].Journal of Functional Materials,2014,45(15):15124.(in Chinese)
[11] COFFIN J L F.A Study of the Effects of Cyclic Thermal Stresses on a Ductile Metal[J].Transactions of the ASME,1954,76:931.
[12] 王建国,杨胜利,王红缨,等.800MPa级低合金高强度钢低周疲劳性能[J].北京科技大学学报,2005,27(1):75.WANG Jianguo,YANG Shengli,WANG Hongying,et al.Low-cycle Fatigue Properties of 800 MPa-grade Ultrafine-grained Steel[J].Journal of University of Science and Technology Beijing,2005,27(1):75.(in Chinese)
[13] TARTAGLIA J M,HAYRYNEN K L.A Comparison of Fatigue Properties of Austempered Versus Quenched and Tempered 4340 Steel[J].Journal of Materials Engineering and Performance,2012,21(6):1008.
[14] QUISPE A,MEDINA S F,GóMEZ M.Influence of Austenite Grain Size on Recrystallisation-Precipitation Interaction in a V-Microalloyed Steel[J].Materials Science and Engineering:A,2007,447(1/2):11.
[15] SAKIN R,IRFAN A.Statistical Analysis of Bending Fatigue Life Data Using Weibull Distribution in Glass-fiber Reinforced Polyester Composites[J].Materials & Design,2008,29(6):1170.
[16] 吕煜坤,盛光敏,黄振华.V-N 微合金化抗震钢筋铁素体中 V(C,N)析出行为分析[J].材料工程,2014(11):43.LYU Yukun,SHENG Guangmin,HUANG Zhenhua.Analysis on V(C,N) Precipitated Behaviors in Ferrite of V-N Microalloyed Anti-seismic Rebars[J].Materials Engineering,2014(11):43.(in Chinese)
[17] LV Y K,SHENG G M,HUANG Z H.High Strain and Low Cycle Fatigue Behaviors of Rebars Produced by QST and V-N Microalloying Technology[J].Construction and Building Materials,2013,48:67.