微合金化热轧低硅多相钢的组织与性能
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摘要
为了开发微合金化热轧低硅多相钢,在不含替代硅的合金元素的化学成分设计基础上,通过热轧实验研究了终冷温度对显微组织和力学性能的影响。结果表明,终冷温度从420℃升高到500℃,均可得到多相组织,其中残余奥氏体量增加了6.5%,马氏体消失,组织中出现大量的贝氏体。当实验钢的轧制工艺参数和开冷温度相近时,组织中的铁素体量、铁素体平均晶粒尺寸大致相同,终冷温度对其硬相特性以及残余奥氏体的分布有很大影响。终冷温度为470℃时,硬相特性及残余奥氏体的分布匹配良好,其屈服强度、延伸率、强塑积分别达到460 MPa、31.3%和21 754 MPa·%。
To develop micro-alloyed hot rolled low silicon multiphase steels, on the basis of chemical composition design without alternative alloying elements, an investigation has been made of the effect of final cooling temperature on the microstructure and mechanical properties by hot rolling experiment. The results show that multiphase microstructure can be obtained with the final cooling temperature increasing from 420℃ to 500℃. The amount of retained austenite increases by 6.5% with the martensite disappearing and a large number of bainites appearing in the structure. When there is a similarity between the rolling process parameters and open cooling temperature, the amount of ferrite and the average grain size of ferrite tend to be the same in the structure, with the final cooling temperature exerting a great influence on the hardness and distribution of retained austenite. When the final cooling temperature reaches 470℃, the hard phase characteristics and the distribution of retained austenite are well matched, with its corresponding yield strength, elongation and the product of strength and elongation being 460 MPa, 31.3% and 21 754 MPa·%, respectively.
To develop micro-alloyed hot rolled low silicon multiphase steels, on the basis of chemical composition design without alternative alloying elements, an investigation has been made of the effect of final cooling temperature on the microstructure and mechanical properties by hot rolling experiment. The results show that multiphase microstructure can be obtained with the final cooling temperature increasing from 420℃ to 500℃. The amount of retained austenite increases by 6.5% with the martensite disappearing and a large number of bainites appearing in the structure. When there is a similarity between the rolling process parameters and open cooling temperature, the amount of ferrite and the average grain size of ferrite tend to be the same in the structure, with the final cooling temperature exerting a great influence on the hardness and distribution of retained austenite. When the final cooling temperature reaches 470℃, the hard phase characteristics and the distribution of retained austenite are well matched, with its corresponding yield strength, elongation and the product of strength and elongation being 460 MPa, 31.3% and 21 754 MPa·%, respectively.
引文
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[14]TIMOKHINA I B,HODGSON P D,PERELOMA EV.Effect of Deformation Schedule on the Microstructure and Mechanical Properties of a Thermomechanically Processed C-Mn-Si Transformation-Induced Plasticity Steel[J].Metallurgical and Materials Transactions A,2003,34(8):1599-1609.[1 5]C H E N H C,E R A H,S H I M I Z U M.E ff e c t o f Phosphorus on the Formation of Retained Austenite and Mechanical Properties in Si-Containing Low-Carbon Steel Sheet[J].Metallurgical Transactions A,1989,20(3):437-445.
[2]MOHAMADIZADEH A,ZAREI-HANZAKI A,MEHTONEN S,et al.Effect of Intercritical Thermomechanical Processing on Austenite Retention and Mechanical Properties in a Multiphase TRIP-Assisted Steel[J].Metallurgical and Materials Transactions A,2016,47(1):436-449.
[3]HAJIANNIA I,SHAMANIAN M,ATAPOUR M,et al.Development of Ultrahigh Strength TRIP Steel Containing High Volume Fraction of Martensite and Study of the Microstructure and Tensile Behavior[J].Transactions of the Indian Institute of Metals,2018,71(6):1363-1370.
[4]SLYCKEN J,VERLEYSEN P,DEGRIECK J,et al.The Effect of Silicon,Aluminium and Phosphor on the Dynamic Behavior and Phenomenological Modelling of Multiphase TRIP Steels[J].Metals and Materials International,2007,13(2):93-101.
[5]LIM N,PARK H,KIM S,et al.Effects of Aluminum on the Microstructure and Phase Transformation of TRIPSteels[J].Metals and Materials International,2012,18(4):647-654.
[6]WANG C,DING H,ZHANG J,et al.Effect of Partial Replacement of Si with Al on the Microstructures and Mechanical Properties of 1000 MPa TRIP Steels[J].Journal of Materials Engineering and Performance,2014,23(11):3896-3906.
[7]SUH D W,PARK S J,LEE T H,et al.Influence of Al on the Microstructural Evolution and Mechanical Behavior of Low-Carbon,Manganese TransformationInduced-Plasticity Steel[J].Metallurgical and Materials Transactions A,2010,41(2):397-408.
[8]ALHARBI F,GAZDER A A,KOSTRYZHEV A,et al.The Effect of Processing Parameters on the Microstructure and Mechanical Properties of Low-Si Transformation-Induced Plasticity Steels[J].Journal of Materials Science,2014,49(7):2960-2974.
[9]RANJAN R,BELADI H,SINGH S B,et al.ThermoMechanical Processing of TRIP-Aided Steels[J].Metallurgical and Materials Transactions A,2015,46(7):3232-3247.
[10]LEE C G,KIM S J,LEE T H,et al.Effects of Volume Fraction and Stability of Retained Austenite on Formability in a 0.1C-1.5Si-1.5Mn-0.5Cu TRIP-Aided Cold-Rolled Steel Sheet[J].Materials Science and Engineering A,2004,371(1/2):16-23.
[11]RYU H B,SPEER J G,WISE J P.Effect of Thermomechanical Processing on the Retained Austenite Content in a Si-Mn Transformation-Induced-Plasticity Steel[J].Metallurgical and Materials Transactions A,2002,33(9):2811-2816.
[12]JACQUES P J,GIRAULT E,HARLET P,et al.The Developments of Cold-Rolled TRIP-Assisted Multiphase Steels.Low Silicon TRIP-Assisted Multiphase Steels[J].ISIJ International,2001,41(9):1061-1067.
[13]TAMURA I.Strength of Steels[M].Tokyo:NikkanKogyo Shinbun,1970:40-41.
[14]TIMOKHINA I B,HODGSON P D,PERELOMA EV.Effect of Deformation Schedule on the Microstructure and Mechanical Properties of a Thermomechanically Processed C-Mn-Si Transformation-Induced Plasticity Steel[J].Metallurgical and Materials Transactions A,2003,34(8):1599-1609.[1 5]C H E N H C,E R A H,S H I M I Z U M.E ff e c t o f Phosphorus on the Formation of Retained Austenite and Mechanical Properties in Si-Containing Low-Carbon Steel Sheet[J].Metallurgical Transactions A,1989,20(3):437-445.