不同退火基体冷轧高强钢的组织特征和性能分析
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摘要
针对一种0.14C-2.72Mn-1.29Si冷轧高强钢进行了轧制和不同等温时效温度的退火处理,得到了两种不同退火基体的组织特征,均具有较好的综合力学性能。利用FESEM、XRD、TEM和拉伸试验对比分析了不同退火基体试验钢的微观组织、力学性能和加工硬化行为。研究表明:试验钢在220~300℃等温时效后钢板的基体组织主要由铁素体和马氏体构成,240℃等温时效后钢板的综合性能最佳,屈服强度为672 MPa,抗拉强度为1333 MPa,总伸长率为13%,屈强比为0.50,组织中含有5.75%的残留奥氏体。而试验钢在390~430℃等温时效后钢板的基体组织主要由铁素体和贝氏体构成,在390℃等温时效后钢板的综合性能最佳,屈服强度为505 MPa,抗拉强度为1115 MPa,总伸长率为17%,屈强比为0.45,组织中含有11.17%的残留奥氏体。铁素体+马氏体基体退火钢优异的综合力学性能主要源于细晶强韧化;而铁素体+贝氏体基体退火钢优异的性能主要源于细晶强韧化和TRIP效应增塑,这两种机制的共同作用,使得钢板在高强度的同时,还具有较好的塑韧性。
A 0. 14C-2. 72Mn-1. 29 Si cold rolling high strength steel was treated by cold rolling and annealing treatment at different isothermal aging temperatures,and different microstructure of the steel with good mechanical properties was obtained. Microstructure of the steel was characterized by FESEM,XRD and TEM,and its mechanical behavior was examined by tensile tests. Results show that the microstructure of the steel sheets consists of ferrite and martensite after isothermal aging at 220-300 ℃,and the best mechanical properties with yield strength of 672 MPa,tensile strength of 1333 MPa,and total elongation of 13% can be obtained for the steel sheets after aging at 240 ℃. The microstructure of ferrite bainite and larger amount of retained austenite is observed for the steel sheets after isothermal aging at 390-430℃,and steel sheets have a good combination of mechanical properties when aging at 390 ℃,with yield strength of505 MPa,tensile strength of 1115 MPa,and total elongation of 17%. Good properties of the tested steel with ferrite and martensite matrix microstructure are due to grain refinement. The good combination of the strength and plasticity of the steel with ferrite and bainite matrix is ascribed to grain refinement,and transformation induced plasticity( TRIP) effect.
A 0. 14C-2. 72Mn-1. 29 Si cold rolling high strength steel was treated by cold rolling and annealing treatment at different isothermal aging temperatures,and different microstructure of the steel with good mechanical properties was obtained. Microstructure of the steel was characterized by FESEM,XRD and TEM,and its mechanical behavior was examined by tensile tests. Results show that the microstructure of the steel sheets consists of ferrite and martensite after isothermal aging at 220-300 ℃,and the best mechanical properties with yield strength of 672 MPa,tensile strength of 1333 MPa,and total elongation of 13% can be obtained for the steel sheets after aging at 240 ℃. The microstructure of ferrite bainite and larger amount of retained austenite is observed for the steel sheets after isothermal aging at 390-430℃,and steel sheets have a good combination of mechanical properties when aging at 390 ℃,with yield strength of505 MPa,tensile strength of 1115 MPa,and total elongation of 17%. Good properties of the tested steel with ferrite and martensite matrix microstructure are due to grain refinement. The good combination of the strength and plasticity of the steel with ferrite and bainite matrix is ascribed to grain refinement,and transformation induced plasticity( TRIP) effect.
引文
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[15]谢保盛,蔡庆伍,余伟,等.回火温度对低碳贝氏体型Q960钢力学性能的影响[J].材料热处理学报,2014,35(5):123-130.XIE Bao-sheng,CAI Qing-wu,YU Wei,et al.Effect of tempering temperature on mechanical properties of Q960 low carbon baninitic steel[J].Transactions of Materials and Heat Treatment,2014,35(5):123-130.
[2]Matlock D K,Speer J G.Design considerations for the next generation of advanced high strength sheet steels[C]//Proceeding of 3rd International Conference.on Advanced Structural Steels(ICASS).The Korean Institute of Metals and Materials,Gyeongju,2006:774-781.
[3]代启锋,宋仁伯,范午言,等.DP1180双相钢在高应变速率变形条件下应变硬化行为及机制[J].金属学报,2012,48(10);1160-1165.DAI Qi-feng,SONG Ren-bo,FAN Wu-yan,et al.Behaviour and mechanism of strain hardening for dual phase steel DP1180 under high strain rate deformation[J].Acta Metall Sin,2012,48(10):1160-1165.
[4]Tirumalasetty G K,van Huis M A,Kwakernaak C,et al.Deformation-induced austenite grain rotation and transformation in TRIP-assisted steel[J].Acta Materialia,2012(60):1311-1321.
[5]陈连生,杨栋,田亚强,等.配分温度对低碳高强Q&P钢组织及力学性能影响[J].材料热处理学报,2014,35(1):55-59.CHEN Lian-sheng,YANG Dong,TIAN Ya-qiang,et al.Effect of partitioning temperature on microstructure and mechanical properties of low carbon high strength Q&P steel[J].Transactions of Materials and Heat Treatment,2014,35(1):55-59.
[6]Emadoddin E,Akbarzadeh A,Daneshi G H.Effect of intercritical annealing on the retained austenite characterization in textured TRIP-assisted steel sheet[J].Materials Characterization,2006,57(4):408-413.
[7]Rosenberg G,SinaiováI,Juhar L'.Effect of microstructure on mechanical properties of dual phase steels in the presence of stress concentrators[J].Materials Science&Engineering A,2013,582:347-358.
[8]闫述,刘相华,刘伟杰,等.含Cu低碳钢Q&P工艺处理的组织性能与强化机理[J].金属学报.2013,49:917-924.YAN Shu,LIU Xiang-hua,LIU Wei-jie,et al.Microstructure,mechanical properties and strengthening mechanisms of a Cu bearing low-carbon steel treated by Q&P process[J].Acta Metall Sin,2013(49):917-924.
[9]尹鸿祥,赵爱民,赵征志,等.退火温度对超细晶中锰TRIP钢组织性能的影响[J].北京科技大学学报,2014,36(3):308-314.YIN Hong-xiang,ZHAO Ai-min,ZHAO Zheng-zhi,et al.Effects of annealing temperature on the microstructure and mechanical properties of ultrafine grained medium-manganese TRIP steel[J].J Univ Sci Technol Beijing,2014,36(3):308-314.
[10]曾尚武,赵征志,赵爱民,等.贝氏体区等温温度对含钒TRIP1180钢组织性能的影响[J].材料热处理学报,2014,35(1):120-124.ZENG Shang-wu,ZHAO Zheng-zhi,ZHAO Ai-min,et al.Effect of isothermal bainite transformation temperature on microstructure and mechanical properties of TRIP1180 steel containing vanadium[J].Transactions of Materials and Heat Treatment,2014,35(1):120-124.
[11]Okitsu Y,Takata N,Tsuji N.A new route to fabricate ultrafine-grained structures in carbon steels without severe plastic deformation[J].Scripta Materialia,2009,60(2):76-79.
[12]余伟,齐越,李亮,等.常化后冷却工艺对1600MPa级超高强钢组织性能的影响[J].北京科技大学学报,2014,36(1):56-62.YU Wei,QI Yue,LI Liang,et al.Effect of cooling process after normalizing on the microstructure and properties of 1600MPa ultra-high strength steel[J].J Univ Sci Technol Beijing,2014,36(1):56-62.
[13]李玉兰,真应力-应变的定义及其力学特征[J].重庆大学学报:自然科学版,2001,24(3):58-60.LI Yu-lan,Definition and mechanical characteristics of true stress-strain[J].Journal of Chongqing University:Natural Science Edition,2001,24(3):58-60.
[14]Seyedrezai H,Pilkey A K,Boyd J D.Effect of pre-IC annealing treatments on the final microstructure and work hardening behavior of a dual-phase steel[J].Materials Science&Engineering A,2014,594(1):178-188.
[15]谢保盛,蔡庆伍,余伟,等.回火温度对低碳贝氏体型Q960钢力学性能的影响[J].材料热处理学报,2014,35(5):123-130.XIE Bao-sheng,CAI Qing-wu,YU Wei,et al.Effect of tempering temperature on mechanical properties of Q960 low carbon baninitic steel[J].Transactions of Materials and Heat Treatment,2014,35(5):123-130.