Acta Metall Sin  2012, Vol. 48 Issue (4): 401-406    DOI: 10.3724/SP.J.1037.2011.00698

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INVESTIGATION OF THE TOUGHNESS OF LOW CARBON TEMPERED MARTENSITE IN THE SURFACE OF Ni-Cr-Mo-B ULTRA-HEAVY PLATE STEEL

WANG Xiaoyong1, PAN Tao1, WANG Hua2, SU Hang1,LI Xiangyang3, CAO Xingzhong4

1. Division of Structural Materials, Central Iron and Steel Research Institute, Beijing 100081 2. Angang Steel Company Limited, Anshan 114021 3. China Iron and Steel Research Institute Group, Beijing 100081 4. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049

WANG Xiaoyong, PAN Tao, WANG Hua, SU Hang,LI Xiangyang, CAO Xingzhong. INVESTIGATION OF THE TOUGHNESS OF LOW CARBON TEMPERED MARTENSITE IN THE SURFACE OF Ni-Cr-Mo-B ULTRA-HEAVY PLATE STEEL. Acta Metall Sin, 2012, 48(4): 401-406.

Abstract References Related Articles Recommended Metrics Download:  PDF(820KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Low carbon tempered martensite structures in the surface of Ni-Cr-Mo-B ultra-heavy plate steel was studied. The toughness at different locations in the surface zone was investigated by impact testing, and the sub-microstructures, such as packets and blocks of the martensite, at different distances (3, 15 and 25 mm) from the surface were observed by OM, SEM and electron backscattered diffraction (EBSD), and the dislocation density were tested by XRD and positron annihilation spectroscopy (PAS). The results indicate that the toughness of the tested steel in the 10 mm from the surface deteriorates sharply, which is mainly due to the bigger packet and block size and higher dislocation density in the tempered martensite. Key words:  ultra-heavy plate steel      EBSD      positron annihilation spectroscopy (PAS)      dislocation density      Received:  09 November 2011      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors YU Xiao-Yong PAN Shou YU Hua SU Hang LI Xiang-Yang CAO Xin-Zhong URL:  https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00698     OR     https://www.ams.org.cn/EN/Y2012/V48/I4/401 [1] Dong T.  Wide Heavy Plate, 1995; 1(3): 1     (东涛. 宽厚板, 1995; 1(3): 1) [2] Tang X S.  Mar Equip Mater Mark, 2010; 1: 10     (唐学生. 船舶物资与市场, 2010; 1: 10) [3] Di G B, Liu Z Y, Hao L Q, Liu X H.  Mater Mech Eng, 2008; 32(8): 1     (狄国标, 刘振宇, 郝利强, 刘相华. 机械工程材料, 2008; 32(8): 1) [4] Li R P, Xie Y H, Shu Z.  China Offshore Platform, 2003; 18(3): 1     (李润培, 谢永和, 舒志. 中国海洋平台, 2003; 18(3): 1) [5] Chen A Z, Niu J C, Deng W P.  Develop Appl Mater, 2010; 25(1): 9     (陈爱志, 牛继承, 邓晚平. 材料开发与应用, 2010; 25(1): 9) [6] Wang R F, Xu K, Xue G.  Hot Work Technol, 2007; 36(16): 43     (王任甫, 徐科, 薛钢. 热加工工艺, 2007; 36(16): 43) [7] Luo Z J, Shen J C, Su H, Ding Y H.  Develop Appl Mater, 2009; 24(5): 1     (罗志俊, 沈俊昶, 苏航, 丁跃华. 材料开发与应用, 2009; 24(5): 1) [8] Xu Z Y.  Martensite and Martensite Transformation. 2nd Ed.,Beijing: Science Press, 1999: 213     (徐祖耀. 马氏体与马氏体相变. 第2版, 北京: 科学出版社, 1999: 213) [9] Tomita Y, Okabayashi K.  Metall Trans, 1986; 176A: 1203 [10] Wang C F, Wang M Q, Shi J, Dong H.  Scr Mater, 2008; 58: 492 [11] Inoue T, Matsuda S, Okamura Y.  Trans JIM, 1970; 11: 36 [12] Luo Z J, Shen J C, Su H, Ding Y H, Yang C F, Zhang Y Q, Ma Y.Trans Mater Heat Treat, 2010; 31(10): 63      (罗志俊, 沈俊昶, 苏航, 丁跃华, 杨才福, 张永权, 马跃.材料热处理学报, 2010; 31(10): 63) [13] Park Y K, Waber J T.  Mater Lett, 1985; 3: 181 [14] Shirai Y, Araki H, Mori T, Nakamura W, Sakaki K.  J Alloys Compd,2002; 330-333: 125 [15] Kuramoto E, Tsutsumi T, Ueno K, Ohmura M, Kamimura Y. 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