两相区退火中锰TRIP钢残余奥氏体含量与加工硬化行为
|
摘要
采用ART (奥氏体逆相变)退火热处理工艺,研究了两相区温轧和退火过程中冷轧中锰TRIP钢中残余奥氏体体积分数变化与加工硬化行为。结果表明:冷轧实验钢经两相区温轧退火处理后,获得了临界铁素体与残余奥氏体或马氏体组成的超细晶复相组织。在645℃,随退火时间的延长,受少量碳化物析出及溶解与C、Mn元素富集程度的影响,残余奥氏体含量由20. 8%先下降至18. 7%后回升至22. 8%最后又骤降至4. 5%。退火时间小于5 h时,实验钢持续加工硬化水平较高,其中均匀塑性形变阶段中,加工硬化指数随退火时间增加,表现出先升高后降低的变化趋势,在退火1 h时加工硬化能力达到最高。
The volume fraction of retained austenite and work-hardening behavior in cold-rolled medium manganese TRIP steel during intercritical warm rolling and annealing were studied by means of ART( austenite reversed transformation) annealing heat treatment process.The results show that the ultrafine-grained multiphase microstructure comprised of intercritical ferrite and retained austenite or martensite is obtained after interciritical warm rolling and annealing for cold rolled of experimental steel. With the increase of annealing time at 645 ℃,retained austenite content firstly decreases from 20. 8% to 18. 7%,then increases to 22. 8%,and finally decreases to 4. 5%,which is mainly affected by the precipitation and dissolution of a small amount of carbide and the enrichment of C/Mn. When the annealing time is less than 5 h,the continuous work-hardening level of experimental steel is higher. In the stage of uniform plastic deformation,with the increase of annealing time,the work-hardening index increases,showing a tendency of increasing firstly and then decreasing. The workhardening capacity of experimental steel reaches the highest when annealing for 1 h.
The volume fraction of retained austenite and work-hardening behavior in cold-rolled medium manganese TRIP steel during intercritical warm rolling and annealing were studied by means of ART( austenite reversed transformation) annealing heat treatment process.The results show that the ultrafine-grained multiphase microstructure comprised of intercritical ferrite and retained austenite or martensite is obtained after interciritical warm rolling and annealing for cold rolled of experimental steel. With the increase of annealing time at 645 ℃,retained austenite content firstly decreases from 20. 8% to 18. 7%,then increases to 22. 8%,and finally decreases to 4. 5%,which is mainly affected by the precipitation and dissolution of a small amount of carbide and the enrichment of C/Mn. When the annealing time is less than 5 h,the continuous work-hardening level of experimental steel is higher. In the stage of uniform plastic deformation,with the increase of annealing time,the work-hardening index increases,showing a tendency of increasing firstly and then decreasing. The workhardening capacity of experimental steel reaches the highest when annealing for 1 h.
引文
[1] LUO H W,SHI J Y,WANG C,et al. Experimental and numerical analysis on formation of stable austenite during the intercritical annealing of 5Mn steel[J]. Acta Materialia,2011,59(10):4002-4014.
[2]陈连生,徐静辉,米振鹏,等. I&Q&P工艺下碳配分时间对0. 12C-1. 33Mn-0. 55Cu钢性能和组织的影响[J].塑性工程学报,2016,23(6):216-220.CHEN Liansheng,XU Jinghui,MI Zhenpeng,et al. Effect of partitioning time on microstructure and mechanical properties of0. 12C-1. 33Mn-0. 55Cu steel in I&Q&P process[J]. Journal of Plasticity Engineering,2016,23(6):23-28.
[3]陈连生,徐静辉,田亚强,等.不同配分机制对含Cu低碳钢组织性能的影响[J].塑性工程学报,2016,23(5):114-119.CHEN Liansheng,XU Jinghui,TIAN Yaqiang,et al. Effect of partitioning processes on microstructure and mechanical properties of low carbon steel with Cu[J]. Journal of Plasticity Engineering,2016,23(5):114-119.
[4] YI H L,RYU J H,BHADESHIA H K D H,et al. Low-alloy duplex, directly quenched transformation-induced plasticity steel[J]. Scripta Materialia,2011,65(7):604-607.
[5] SPEER J,MATLOCK D K,COOMAN B C D,et al. Carbon partitioning into austenite after martensite transformation[J]. Acta Materialia,2003,51(9):2611-2622.
[6] WANG C,CAO W Q,HAN Y,et al. Influences of austenization temperature and annealing time on duplex ultrafine microstructure and mechanical properties of medium Mn steel[J]. Journal of Iron and Steel Research,International,2015,22(1):42-47.
[7] SHI J,CAO W Q,DONG H. Ultrafine grained high strength low alloy steel with high strength and high ductility[J]. Materials Science Forum,2010,654-656(1):238-241.
[8] LEE S,COOMAN B C D. On the selection of the optimal intercritical annealing temperature for medium Mn TRIP steel[J]. Metallurgical&Materials Transactions A Physical Metallurgy&Materials Science,2013,44(11):5018-5024.
[9] LI Y,LI X,YUAN G,et al. Microstructure and partitioning behavior characteristics in low carbon steels treated by hot-rolling direct quenching and dynamical partitioning processes[J]. Materials Characterization,2016,121:157-165.
[10]邝霜,康永林,于浩,等. Fe-C-Mn系冷轧双相钢两相区奥氏体化过程模拟[J].工程科学学报,2008,30(8):858-863.KUANG Shuang,KANG Yonglin,YU Hao,et al. Simulation of austenization during intercritical annealing for Fe-C-Mn cold rolling dual phase steel[J]. Chinese Journal of Engineering,2008,30(8):858-863.
[11] BREEDIS J F. Influence of dislocation substructure on the martensitic transformation in stainless steel[J]. Acta Metallurgica,1965,13(3):239-250.
[12] MISHRA G,CHANDAN A K,KUNDU S. Hot rolled and cold rolled medium manganese steel:Mechanical properties and microstructure[J]. Materials Science&Engineering A,2017,701:319-327.
[13] KIM J,LEE S J,BRUNO C De C. Effect of Al on the stacking fault energy of Fe-18Mn-0. C twinning-induced plasticity[J].Scripta Materialia,2011,65(4):363-366.
[14] LEE S,COOMAN B C D. Influence of carbide precipitation and dissolution on the microstructure of ultra-fine-grained intercritically annealed medium manganese steel[J]. Metallurgical&Materials Transactions A,2016,47(7):3263-3270.
[15] MIYAMOTO G,OH J C,HONO K,et al. Effect of partitioning of Mn and Si on the growth kinetics of cementite in tempered Fe-0. 6mass%C martensite[J]. Acta Materialia,2007,55(15):5027-5038.
[16] MEJIA I,MALDONADO C,BENITO J A,et al. Determination of the work hardening exponent by the hollomon and differential crussard-jaoul analyses of cold drawn ferrite-pearlite steels[J]. Materials Science Forum,2006,509:37-42.
[17]谢振家,尚成嘉,周文浩,等.低合金多相钢中残余奥氏体对塑性和韧性的影响[J].金属学报,2016,52(2):224-232.XIE Zhenjia,SHANG Chengjia,ZHOU Wenhao,et al. Effect of retained austenite on ductility and toughness of a low alloyed multiphase steel[J]. Acta. Metall. Sin,2016,52(2):224.
[18]赵征志,佟婷婷,赵爱民,等. 1300 MPa级0. 14C-2. 72Mn-1. 3Si钢的显微组织和力学性能及加工硬化行为[J].金属学报,2014,50(10):1153-1162.ZHAO Zhengzhi,TONG Tingting,ZHAO Aimin,et al. Microstructure,mechanical properties and work hardening behavior of1300 MPa grade 014C-2. 72Mn-1. 3Si steel[J]. Acta Metall.Sin.,2014,50(10):1153-1162.
[19] TIRUMALASETTY G K,HUISM A V,KWAKEMAAK C,et al.Deformation-induced austenite grain rotation and transformation in TRIP-assisted steel[J]. Acta Materialia, 2012, 60(3):1311-1321.
[2]陈连生,徐静辉,米振鹏,等. I&Q&P工艺下碳配分时间对0. 12C-1. 33Mn-0. 55Cu钢性能和组织的影响[J].塑性工程学报,2016,23(6):216-220.CHEN Liansheng,XU Jinghui,MI Zhenpeng,et al. Effect of partitioning time on microstructure and mechanical properties of0. 12C-1. 33Mn-0. 55Cu steel in I&Q&P process[J]. Journal of Plasticity Engineering,2016,23(6):23-28.
[3]陈连生,徐静辉,田亚强,等.不同配分机制对含Cu低碳钢组织性能的影响[J].塑性工程学报,2016,23(5):114-119.CHEN Liansheng,XU Jinghui,TIAN Yaqiang,et al. Effect of partitioning processes on microstructure and mechanical properties of low carbon steel with Cu[J]. Journal of Plasticity Engineering,2016,23(5):114-119.
[4] YI H L,RYU J H,BHADESHIA H K D H,et al. Low-alloy duplex, directly quenched transformation-induced plasticity steel[J]. Scripta Materialia,2011,65(7):604-607.
[5] SPEER J,MATLOCK D K,COOMAN B C D,et al. Carbon partitioning into austenite after martensite transformation[J]. Acta Materialia,2003,51(9):2611-2622.
[6] WANG C,CAO W Q,HAN Y,et al. Influences of austenization temperature and annealing time on duplex ultrafine microstructure and mechanical properties of medium Mn steel[J]. Journal of Iron and Steel Research,International,2015,22(1):42-47.
[7] SHI J,CAO W Q,DONG H. Ultrafine grained high strength low alloy steel with high strength and high ductility[J]. Materials Science Forum,2010,654-656(1):238-241.
[8] LEE S,COOMAN B C D. On the selection of the optimal intercritical annealing temperature for medium Mn TRIP steel[J]. Metallurgical&Materials Transactions A Physical Metallurgy&Materials Science,2013,44(11):5018-5024.
[9] LI Y,LI X,YUAN G,et al. Microstructure and partitioning behavior characteristics in low carbon steels treated by hot-rolling direct quenching and dynamical partitioning processes[J]. Materials Characterization,2016,121:157-165.
[10]邝霜,康永林,于浩,等. Fe-C-Mn系冷轧双相钢两相区奥氏体化过程模拟[J].工程科学学报,2008,30(8):858-863.KUANG Shuang,KANG Yonglin,YU Hao,et al. Simulation of austenization during intercritical annealing for Fe-C-Mn cold rolling dual phase steel[J]. Chinese Journal of Engineering,2008,30(8):858-863.
[11] BREEDIS J F. Influence of dislocation substructure on the martensitic transformation in stainless steel[J]. Acta Metallurgica,1965,13(3):239-250.
[12] MISHRA G,CHANDAN A K,KUNDU S. Hot rolled and cold rolled medium manganese steel:Mechanical properties and microstructure[J]. Materials Science&Engineering A,2017,701:319-327.
[13] KIM J,LEE S J,BRUNO C De C. Effect of Al on the stacking fault energy of Fe-18Mn-0. C twinning-induced plasticity[J].Scripta Materialia,2011,65(4):363-366.
[14] LEE S,COOMAN B C D. Influence of carbide precipitation and dissolution on the microstructure of ultra-fine-grained intercritically annealed medium manganese steel[J]. Metallurgical&Materials Transactions A,2016,47(7):3263-3270.
[15] MIYAMOTO G,OH J C,HONO K,et al. Effect of partitioning of Mn and Si on the growth kinetics of cementite in tempered Fe-0. 6mass%C martensite[J]. Acta Materialia,2007,55(15):5027-5038.
[16] MEJIA I,MALDONADO C,BENITO J A,et al. Determination of the work hardening exponent by the hollomon and differential crussard-jaoul analyses of cold drawn ferrite-pearlite steels[J]. Materials Science Forum,2006,509:37-42.
[17]谢振家,尚成嘉,周文浩,等.低合金多相钢中残余奥氏体对塑性和韧性的影响[J].金属学报,2016,52(2):224-232.XIE Zhenjia,SHANG Chengjia,ZHOU Wenhao,et al. Effect of retained austenite on ductility and toughness of a low alloyed multiphase steel[J]. Acta. Metall. Sin,2016,52(2):224.
[18]赵征志,佟婷婷,赵爱民,等. 1300 MPa级0. 14C-2. 72Mn-1. 3Si钢的显微组织和力学性能及加工硬化行为[J].金属学报,2014,50(10):1153-1162.ZHAO Zhengzhi,TONG Tingting,ZHAO Aimin,et al. Microstructure,mechanical properties and work hardening behavior of1300 MPa grade 014C-2. 72Mn-1. 3Si steel[J]. Acta Metall.Sin.,2014,50(10):1153-1162.
[19] TIRUMALASETTY G K,HUISM A V,KWAKEMAAK C,et al.Deformation-induced austenite grain rotation and transformation in TRIP-assisted steel[J]. Acta Materialia, 2012, 60(3):1311-1321.