Acta Metall Sin  2012, Vol. 48 Issue (4): 455-460    DOI: 10.3724/SP.J.1037.2011.00722

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EFFECT OF QUENCHING TEMPERATURE ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF 550 MPa GRADE THICK STEEL PLATE

WAN Decheng, YU Wei, LI Xiaolin, ZHANG Jie, WU Huibin, CAI Qingwu

Metallurgical Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083

WAN Decheng, YU Wei, LI Xiaolin, ZHANG Jie, WU Huibin, CAI Qingwu. EFFECT OF QUENCHING TEMPERATURE ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF 550 MPa GRADE THICK STEEL PLATE. Acta Metall Sin, 2012, 48(4): 455-460.

Abstract References Related Articles Recommended Metrics Download:  PDF(909KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The heat treatments of 730-910 ℃ quenching and 600 ℃ tempering were applied to enhance the low temperature toughness of 550 MPa grade thick steel plate. Moreover, the effect of quenching temperature on the microstructure and mechanical properties was studied. The results showed that strength and toughness of the specimen decreased at first and then increased as quenching temperature increased within intercritical region. When the quenching temperature was raised up to austenite region, the strength increased further, but the toughness decreased. Mechanical properties of the steel subjected to intercritical quenching at 760 ℃ and tempering were the worst of all of the specimen, due to coarsened polygonal ferrite and the lath, acicular M/A constituent along grain boundaries and inside the grains, which deteriorated the toughness seriously. On the other hand, the steel treated by intercritical quenching at 850 ℃ and tempering showed the optimum combination of strength and toughness compared with the steel treated by quenching after austenization and tempering. This is attributed to microstructure refinement, higher fraction of high angle grain boundaries caused by the formation of ferrite, abundant homogeneous dislocation cell substructure and stable thin film retained austenite. Key words:  thick steel plate      quenching temperature      microstructure      mechanical property      Received:  18 November 2011      ZTFLH:  TG142.1   Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors WAN De-Cheng YU Wei LI Xiao-Lin ZHANG Jie WU Hui-Bin SA Qiang-Wu URL:  https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00722     OR     https://www.ams.org.cn/EN/Y2012/V48/I4/455 [1] Hicho G E, Smith L C, Singhal S, Fields R J.  J Heat Treat,1984; 3: 205 [2] Dhua S K, Mukerjee D, Sarma D S.  Metall Mater Trans,2003; 34A: 2493 [3] Zhang C L, Cai D Y, Liao B, Zhao T C, Fan Y C.  Mater Lett, 2004; 58: 1524 [4] Bakhtiari R, Ekrami A.  Mater Sci Eng, 2009; A525: 159 [5] Hwang B, Lee C G.  Mater Sci Eng, 2010; A527: 4341 [6] Maleque M A, Poon Y M, Masjuki H H.  J Mater Process Technol, 2004; 153--154: 482 [7] Zhu H B, Hu S P, Wu H B, Dong C F, Wang L J.  J Univ Sci Technol Beijing, 2010; 32: 1552     (朱海宝, 胡水平, 武会宾, 董常福, 王立军. 北京科技大学学报,2010; 32: 1552) [8] Liu D S, Cheng B G, Luo M.  Trans Mater Heat Treat,2011; 32(9): 125     (刘东升, 程丙贵, 罗咪. 材料热处理学报, 2011; 32(9): 125) [9] Chen Y Y, Cheng B G, Liu D S.  Met Heat Treat, 2012; 37: 77     (陈圆圆, 程丙贵, 刘东升. 金属热处理, 2012; 37: 77) [10] Zou D H, Peng Z F, Li P H, Guo A M.  Adv Mater Res,2011; 152--153: 1276 [11] Sui Y, Cong J G, Liu M.  Shandong Metall, 2004; 26: 197      (隋轶, 丛津功, 刘明. 山东冶金, 2004; 26: 197) [12] Zhou Y L, Di G B, Liu Z Y, Wang G D.  Trans Mater Heat Treat,2011; 32(10): 106      (周砚磊, 狄国标, 刘振宇, 王国栋. 材料热处理学报, 2011; 32(10): 106) [13] Tong K, Zhuang C J, Liu Q, Han X L, Zhu L X, He X D.  Mater Mech Eng, 2011; 35(2): 4      (仝珂, 庄传晶, 刘强, 韩新利, 朱丽霞, 何小东.机械工程材料, 2011; 35(2): 4) [14] Liao B, Xiao F R.  Trans Mater Heat Treat, 2009; 30(2): 57      (廖波, 肖福仁. 材料热处理学报, 2009; 30(2): 57) [15] Wen Y H, Tang D, Wu H B, Guo Z.  J Univ Sci Technol Beijing,2008; 30: 724      (温永红, 唐荻, 武会宾, 郭振. 北京科技大学学报, 2008; 30: 724) [16] Hwang B, Lee C G, Kim S J.  Metall Mater Trans, 2011; 42A: 717 [17] Gao K, Wang L D, Zhu M, Chen J D, Shi Y J, Kang M K. 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