Effects of Cooling Parameters on Microstructures and Mechanical Properties of Hot Rolled TiMicroalloyed LowCarbon Ultra HighStrength Steels

doi:10.12068/j.issn.1005-3026.2014.04.012

Abstract

Abstract: The thermomechanical control process(TMCP) was carried out for the high Ti microalloyed low carbon steel. The effects of supercooling and the atomic diffusion rate on the evolution of the microstructure and the behavior of the (Ti， Mo)C particles precipitation were studied under different controlled cooling rates and coiling temperatures. The results showed that the comprehensive mechanical properties of the experimental steel were outstanding with the cooling rate of 30℃/s and the coiling temperature of 420℃， i.e.， the yield strength of the steel was 690MPa， the tensile strength was 820MPa， the elongationafterfracture was 18%， and the experimental steel possessed excellent low temperature impact toughness. The microstructure consisted of polygonal ferrite，acicular ferrite， fine M/A islands and nanoscale (Ti， Mo)C precipitates， and the strength and toughness are wellmatched.

Key words: high Ti steels, ultra highstrength steel, microstructure evolution, mechanical property, cooling parameter

CLC Number:

TP274

XIE Hui， DU Linxiu， HU Jun. Effects of Cooling Parameters on Microstructures and Mechanical Properties of Hot Rolled TiMicroalloyed LowCarbon Ultra HighStrength Steels[J]. Journal of Northeastern University Natural Science, 2014, 35(4): 508-511.

References

[1] 王国栋，刘相华，吴迪.节约型钢铁材料及其减量化加工制造［J］.轧钢，2006，23(2):1/5.(Wang Guodong，Liu Xianghua，Wu Di.Saving type steel products and its reduced steel rolling technology［J］.Steel Rolling，2006，23(2):1/5)
[2] Han Y，Shi J.Effect of hot rolling temperature on grain size and precipitation hardening in a Timicroalloyed lowcarbon martensitic steel［J］.Materials Science and Engineering A，2012，553(1):192/199.
[3] Funakawa Y，Shiozaki T，Tomita K，et al.Development of high strength hotrolled sheet steel consisting of ferrite and nanometersized carbides［J］.ISIJ International，2004，44(11):1945/1951.
[4] Park D B，Huh M Y，Shim J H，et al.Strengthening mechanism of hot rolled Ti and Nb microalloyed HSLA steels containing Mo and W with various coiling temperature［J］.Materials Science and Engineering A，2012，560(1):528/534.
[5] Wang X N，Du L X，Xie H，et al.Effect of deformation on continuous cooling phase transformation behaviors of 780MPa NbTi ultrahigh strength steel［J］.Steel Research，2011，82(12):1417/1424.
[6] Khlestov V M，Konopleva E V，Mcqueen H J.Kinetics of austenite transformation during thermomechanical processes［J］.Canadian Metallurgical Quarterly，1998，37(2):75/88.
[7] Hu J，Du L X，Wang J J.Effect of cooling procedure on microstructures and mechanical properties of hot rolled NbTi bainitic high strength steel［J］.Materials Science and Engineering A，2012，554(2):79/85.
[8] Misra R D K，Nathani H，Hartman J E，et al.Microstructural evolution in a new 770MPa hot rolled NbTi microallyed steel［J］.Materials Science and Engineering A，2005，394(2):339/352.
[9] 衣海龙，王晓南，杜林秀，等.710MPa级热轧高强钢的组织性能［J］.东北大学学报，自然科学版，2009，30(10):1421/1423.(Yi Hailong，Wang Xiaonan，Du Linxiu，et al.Microstructure and mechanical properties of 710MPa hotrolled highstrength steel［J］.Journal of Northeastern University:Nature Science，2009，30(10):1421/1423.)

[1]	WU Guan-qing， WEI Jin， YUE Xia-bing， YIN Zeng-liang. Deformation Characteristics and Vertical Earth Pressure Calculation of Low Fill Steel Corrugated Pipe Culverts [J]. Journal of Northeastern University(Natural Science), 2022, 43(9): 1337-1345.
[2]	TIAN Ni ， ZHANG Yao-zhong， ZHOU Yi-ran， QIN Guang-hua. Effect of Zr Addition on Microstructure and Mechanical Properties of Al-10Zn-2.5Mg-1.6Cu Alloy Sheet [J]. Journal of Northeastern University(Natural Science), 2022, 43(7): 951-958.
[3]	ZHAO Yu-hui ， GAO Meng-qiu ， ZHAO Ji-bin ， HE Chen. Microstructure and Properties of WC Particles Reinforced 316L Stainless Steel Composites Prepared by Additive and Subtractive Manufacturing [J]. Journal of Northeastern University(Natural Science), 2022, 43(2): 197-205.
[4]	ZHU Cheng-lin， GAO Xiu-hua， WANG Ming-ming， SONG Li-ying. Effect of Quenching Temperature on Microstructure and Mechanical Properties of 12Cr14Ni2 Stainless Structural Steel [J]. Journal of Northeastern University(Natural Science), 2021, 42(6): 781-788.
[5]	DONG Shuo， SHA Song， MENG Shi-qian， RONG Guan. Experimental Investigation of Mechanical Properties of Three Types of High Temperature Rocks After Liquid Nitrogen Cooling [J]. Journal of Northeastern University(Natural Science), 2021, 42(11): 1591-1599.
[6]	BAO Jun-feng， YU Yue-guang， JIA Cheng-chang. Effects of ZrO₂ Addition Amount on Microstructure and Mechanical Property of WC-6Co Prepared by Spark Plasma Sintering [J]. Journal of Northeastern University(Natural Science), 2021, 42(1): 43-48.
[7]	WANG Ming-ming， GAO Xiu-hua， DU Lin-xiu， ZHANG Da-zheng. Microstructure and Mechanical Properties of V-N Microalloyed X80 High Deformability Pipeline Steel [J]. Journal of Northeastern University Natural Science, 2020, 41(6): 801-806.
[8]	ZHANG Zhi-qiang， HE Chang-shu， ZHAO Su， ZHAO Xiang. Microstructure and Mechanical Properties of the Stirred Zone of Ultrasonic Assisted Friction Stir Welded Joint of 7075-T6 Alloy [J]. Journal of Northeastern University Natural Science, 2020, 41(12): 1708-1714.
[9]	YU Tian-biao， ZHAO Yu， BI Xiao-xi， CHEN Ya-dong. Effect of Porous Structure on Mechanical Properties of Vero White Photosensitive Resin [J]. Journal of Northeastern University Natural Science, 2019, 40(6): 852-856.
[10]	HUANG Hui-qiang， DI Hong-shuang， ZHANG Tian-yu， YAN Ning. Effect of Intercritical Annealing Temperature on Microstructure and Mechanical Property of High Al-Low Si TRIP Steel [J]. Journal of Northeastern University Natural Science, 2019, 40(12): 1700-1706.
[11]	LIU Jing， LIU Yi-ting. Microstructures and Mechanical Properties of Laser Rapid Prototyping Deposited TC4 Alloy [J]. Journal of Northeastern University Natural Science, 2018, 39(8): 1132-1136.
[12]	CHEN Qi-yuan， ZHOU Xiao-guang， LIU Zhen-yu， WU Si-wei. Microstructure and Properties of Ti Microalloyed Automobile Frame Steel 510L [J]. Journal of Northeastern University Natural Science, 2018, 39(3): 339-344.
[13]	JIA Peng， ZHANG Yao， JI Wan-min， ZHAO Ai-cheng. 3D Numerical Analysis for Effect of Mechanical Properties on Failure Process of Serial and Parallel Rock Pillar System [J]. Journal of Northeastern University Natural Science, 2018, 39(3): 431-436.
[14]	LI Zhen-lei， CHEN Dong， KANG Jian， YUAN Guo. Effect of Online-Cooling on Microstructure and Mechanical Properties of Hot-Rolled L360 Steel Pipe [J]. Journal of Northeastern University Natural Science, 2018, 39(11): 1588-1592.
[15]	HAN Huai-bin ， ZHAO Xian-ming， WANG Wei， WAN Chang- jie. Effect of Through-Water Cooling on Microstructure and Mechanical Properties of GCr15 Bearing Steel [J]. Journal of Northeastern University Natural Science, 2018, 39(10): 1390-1395.