|
|
EXPERIMENTAL STUDY OF THE IMPACT FRACTURE BEHAVIOR OF FH550 OFFSHORE PLATFORM STEEL |
ZHOU Yanlei, XU Yang, CHEN Jun, LIU Zhenyu |
State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819 |
|
Cite this article:
ZHOU Yanlei XU Yang CHEN Jun LIU Zhenyu. EXPERIMENTAL STUDY OF THE IMPACT FRACTURE BEHAVIOR OF FH550 OFFSHORE PLATFORM STEEL. Acta Metall Sin, 2011, 47(11): 1382-1387.
|
Abstract The impact fracture behavior of FH550 offshore platform steel was investigated by use of SEM, TEM and EDS. The experimental results show that the microstructure of as--rolled test steel is consist of low bainite and granular bainite, and tempered bainite is the main structure of this steel after tempering. The dimple fracture was observed on most of frature surfaces of samples, and and some inclusions, such as CaO and Al2O3, appear at the bottom of isometric dimples. Carbides inclusions more than 10 μm were found on the cleavage fracture surface of a few of samples which could aggravate the impact toughness, and result in the fluctuation of the impact energy as brittle particles. Micropore accumulating and growing and crack necking are the main way for propagation of cracks, however, shear crack propagation may be obstructed by the particle clusters generated during plastic deformation, increasing the crack propagation work. It is also found that the fraction of high angle grain boundaries is 79.3%, and the average grain size is 7.61 μm. High percentage of large angle grain boundaries and fine grain size are the key factors to obtain excellent impact toughness.
|
Received: 14 June 2011
|
|
Fund: Supported by High Technology Research and Development Program of China (No.2007AA03Z504) |
[1] Sun X J, Xu H Q, Li W S. Shandong Metall, 2009; 31(3): 11(孙宪进, 徐洪庆, 李旺生. 山东冶金, 2009; 31(3): 11)[2] 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)[3] Lu Z X, Wang F C, Zhang Y Y, Guo A M. Res Iron Steel, 2005; 6: 17(陆在学, 汪福成, 张云燕, 郭爱民. 钢铁研究, 2005; 6: 17)[4] Nobuo S, Shinji M, Shigeru E. JFE Tech Rep, 2008; 11: 1[5] Zhang X Z, Knott J F. Acta Mater, 1999; 47: 3483[6] Chai F, Yang C F, Zhang Y Q, Xu Z. J Iron Steel Res, 2005; 17: 42(柴锋, 杨才福, 张永权, 徐洲. 钢铁研究学报, 2005; 17: 42)[7] Guo A M, Zou D H, Yi L X, Dong H X, Li P H, Liu K, Wu K M. Acta Metall Sin, 2009; 45: 390(郭爱民, 邹德辉, 易伦雄, 董汉雄, 李平和, 刘 凯, 吴开明. 金属学报, 2009; 45: 390)[8] Chen Y, Lambert S. Int J Fract, 2003; 124: 179[9] Kunio T, Shimizu M, Yamada K, Suzuki H. Eng Fract Mech, 1975; 7: 411[10] Yong Q L. Secondary Phases in Steels. Beijing: MetallurgicalIndustry Press, 2006: 27(雍岐龙. 钢铁材料中的第二相. 北京: 冶金工业出版社, 2006: 27)[11] Fang H S, Feng C, Zheng Y K, Zheng X H, Zhang C, Bai B Z. Acta Metall Sin, 2007; 43: 583(方鸿生, 冯春, 郑燕康, 郑秀华, 张弛, 白秉哲. 金属学报, 2007; 43: 583)[12] Cui Y X, Wang C L. Fracture Analysis. Harbin: Harbin Institute of Technology Press, 1998: 73(崔约贤, 王常利. 金属断口分析. 哈尔滨: 哈尔滨工业大学出版社, 1998: 73)[13] Wang X S, Liang F, Zeng Y P, Xie X S. Acta Metall Sin, 2005; 41: 1272(王习术, 梁锋, 曾燕屏, 谢锡善. 金属学报, 2005; 41: 1272)[14] Beachem C D. Metall Trans, 1975; 6A: 377[15] Schawlbe K. Eng Fract Mech, 1977; 9: 795[16] David B. Elementary Engineering Fracture Mechanics. Netherlands: Martinus Nijhoff Publishers, 1986: 1[17] Qiao Y, Argon A S. Mech Mater, 2003; 35: 313[18] Qiao Y, Argon A S. Mech Mater, 2003; 35: 129 |
No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
|
Shared |
|
|
|
|
|
Discussed |
|
|
|
|