|
|
Controlled Rolling and Cooling of Ultra-High Strength Ferrite-Bainite Dual Phase Steel |
WU Di1,LI Zhuang2,L Wei3 |
1. State Key Lab of Rolling and Automation, Northeastern University, Shenyang 110004, Liaoning, China 2. School of Materials Science and Engineering, Shenyang Aerospace University, Shenyang 110136, Liaoning, China 3. School of Graduate, Shenyang Aerospace University, Shenyang 110136, Liaoning, China |
|
|
Abstract Controlled rolling and cooling of ultra-high strength ferrite-bainite dual phase steel in the different conditions were conducted by a laboratory hot rolling mill. Effect of various processing parameters on the microstructure and mechanical properties of the steel was investigated. The results show that ultra-high strength dual phase steel with ferrite-bainite microstructure can be obtained by applying controlled rolling and cooling. The tensile strength values are nearly the same in all cases and always exceed 1000MPa, yield ratio varies from 0.54 to 0.62 and the total elongation varies from 13% to 17% for the specimens which are cooled at different cooling rates after various finish rolling temperatures. The ferrite grains are refined with decreasing finish rolling temperature and accelerating cooling, and the amount of bainite increases with decreasing finish cooling temperature. Tensile strength, total elongation and the product of tensile strength and total elongation for the specimen, which is finished rolling at 800℃ and subsequent laminar cooling to 560℃ and then air cooling to room temperature, reach maximum values (1130MPa, 16% and 18080MPa%, respectively). This is attributed to the ferrite-grain refinement, strengthening of granular bainite, carbide free bainite and a small amount of twinning martensite. The presence of retained austenite improves the ductility of the steel. Multiphase microstructures contain ferrite and bainite as main phase with a small amount of retained austenite and martensite, contribute to enhance mechanical properties of tested steel.
|
Received: 11 October 2011
Published: 05 September 2012
|
|
|
|
|
[1] |
康永林,陈贵江,朱国明等,.新一代汽车用先进高强钢的成形与应用[J].钢铁,2010,45(8 ):1-19
|
[1] |
康永林,陈贵江,朱国明等,.新一代汽车用先进高强钢的成形与应用[J].钢铁,2010,45(8 ):1-19
|
[2] |
Saeidi N,Ekrami A.Comparison of Mechanical Properties of Martensite/Ferrite and Bainite/Ferrite Dual Phase 4340 Steels[J].Materials Science & Engineering A,2009,A523:125-
|
[2] |
Saeidi N,Ekrami A.Comparison of Mechanical Properties of Martensite/Ferrite and Bainite/Ferrite Dual Phase 4340 Steels[J].Materials Science & Engineering A,2009,A523:125-
|
[3] |
Ming Hui C, Hua D, Zheng You T, et al.Strain Hardening Behavior of High Performance FBDP, TRIP and TWIP Steels[J].,2011,82(3):242-248
|
[3] |
Ming Hui C, Hua D, Zheng You T, et al.Strain Hardening Behavior of High Performance FBDP, TRIP and TWIP Steels[J].,2011,82(3):242-248
|
[4] |
Yu Zolotarevskii N, Titovets Yu F, Samoilov A N, et al.Modeling of Structure of Double-Phase Low-Carbon Chromium Steels[J].Metal Science and Heat Treatment,2007,49(1-2):10-16
|
[4] |
Yu Zolotarevskii N, Titovets Yu F, Samoilov A N, et al.Modeling of Structure of Double-Phase Low-Carbon Chromium Steels[J].Metal Science and Heat Treatment,2007,49(1-2):10-16
|
[5] |
方鸿生,工家军,杨志纲,等. 贝氏体相变.[J].科学出版社,1999,:-
|
[5] |
方鸿生,工家军,杨志纲,等. 贝氏体相变.[J].科学出版社,1999,:-
|
[6] |
Weng Y Q, Sun X J, Dong H, et al.Overview on the Theory of Deformation Induced Ferrite Transformation[J].Iron & Steel Supplement,2005,40:9-15
|
[6] |
Weng Y Q, Sun X J, Dong H, et al.Overview on the Theory of Deformation Induced Ferrite Transformation[J].Iron & Steel Supplement,2005,40:9-15
|
[7] |
Quidort D and Breehet Y.The role of carbon on the kinetics of bainite transformation in steels[J].,2002,47(3):151-156
|
[7] |
Quidort D and Breehet Y.The role of carbon on the kinetics of bainite transformation in steels[J].,2002,47(3):151-156
|
[8] |
翁宇庆等著.超细晶钢-钢的组织细化理论与控制技术[J].冶金工业出版社,2003,20:497-
|
[8] |
翁宇庆等著.超细晶钢-钢的组织细化理论与控制技术[J].冶金工业出版社,2003,20:497-
|
[1] |
WEI Tong-yu, ZOU De-ning, ZHANG Ying-bo, CHEN Wan-wan. Effect of aluminum on microstructure and properties of high alumina ferritic heat resistant steel[J]. Iron and Steel, 2020, 55(6): 80-83. |
[2] |
ZHAO Yun-peng, YU Chao, XIAO Hong, WU Zong-he, XU Peng-peng, XIE Hong-biao. Effect of pure iron interlayer on mechanical properties of hot rolled stainless steel clad plate[J]. Iron and Steel, 2020, 55(5): 73-79. |
[3] |
SHAO Cheng-wei, WANG Jun-tao, ZHAO Xiao-li, HUI Wei-jun. Microstructure and mechanical properties of intercritically annealed Al-contain medium Mn steel[J]. Iron and Steel, 2020, 55(5): 87-93. |
[4] |
WANG Ji-hong, ZHANG Li-na, CHEN De-li, QI Yue, CAO Li-hong. Discussion about heat treatment process of X20Cr13 blade steel for gas turbine[J]. PHYSICS EXAMINATION AND TESTING, 2020, 38(3): 18-. |
[5] |
XING Xian-qiang, CAO Wen-quan, WANG Cun-yu. Bond structure of 55SiCr steel used for coil springs of automotive suspension system[J]. Iron and Steel, 2020, 55(3): 68-73. |
[6] |
YANG Yu-dan,ZHAO Hong-shan,LIU Teng-shi,DONG Han. Microstructure and properties of new high-carbon martensitic stainless steel[J]. JOURNAL OF IRON AND STEEL RESEARCH , 2020, 32(2): 135-142. |
|
|
|
|