Improvement of Charpy impact properties in heat affected zones of API X80 pipeline steels containing complex oxides

被引:9
作者
Shin, S. Y. [1 ]
Oh, K. [2 ]
Kang, K. B. [3 ]
Lee, S. [1 ]
机构
[1] Pohang Univ Sci & Technol, Ctr Adv Aerosp Mat, Pohang 790784, South Korea
[2] POSCO, Tech Res Labs, Steelmaking Res Grp, Pohang 790785, South Korea
[3] POSCO, Tech Res Labs, Steel Solut Res Grp, Pohang 790785, South Korea
关键词
API X80 pipeline steel; Heat affected zone; Complex oxides; ACICULAR FERRITE; LOW-CARBON; HIGH-STRENGTH; MICROSTRUCTURES; BEHAVIOR;
D O I
10.1179/174328409X425218
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The present study aimed at investigating the improvement of Charpy impact properties in heat affected zones (HAZs) of API X80 pipeline steels containing complex oxides. Three kinds of steels were fabricated by adding Ti, Al and Mg to form complex oxides and their microstructures, tensile properties and Charpy impact properties were investigated. The number of complex oxides increased as the excess amount of Ti, Al and Mg was included in the steels. After the HAZ simulation test, the steel having a number of oxides contained about 72 vol.-% of acicular ferrite in the simulated HAZ, together with bainitic ferrite and granular bainite, whereas the HAZ microstructures of the conventional steels consisted of bainitic ferrite and granular bainite with a small amount of acicular ferrite. The volume fraction of acicular ferrite increased as the amount of complex oxides increased and the heat input decreased, and thus, Charpy impact properties of the oxide containing steel HAZs were greatly improved over those of the conventional steel HAZs.
引用
收藏
页码:1049 / 1058
页数:10
相关论文
共 22 条
[1]  
*ASTM, 2006, E2306 ASTM
[2]   FORMATION OF ACICULAR FERRITE AT OXIDE PARTICLES IN STEELS [J].
BARBARO, FJ ;
KRAUKLIS, P ;
EASTERLING, KE .
MATERIALS SCIENCE AND TECHNOLOGY, 1989, 5 (11) :1057-1068
[3]  
Bhadeshia H. K. D. H., 1992, BAINITE STEELS, P237
[4]  
Corbett KT, 2004, INT J OFFSHORE POLAR, V14, P75
[5]  
DENYS R, 2000, PIPELINE TECHNOLOGY, V1, P1
[6]   Analysis of different acicular ferrite microstructures in low-carbon steels by electron backscattered diffraction.: Study of their toughness behavior [J].
Díaz-Fuentes, M ;
Iza-Mendia, A ;
Gutiérrez, I .
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2003, 34A (11) :2505-2516
[7]   The morphology of Al-Ti-O complex oxide inclusions formed in an ultra low-carbon steel melt during the RH process [J].
Doo, Won-Chul ;
Kim, Dong-Yong ;
Kang, Soo-Chang ;
Yi, Kyung-Woo .
METALS AND MATERIALS INTERNATIONAL, 2007, 13 (03) :249-255
[8]  
DYE SA, 1970, MET CONSTR-BRIT WELD, V2, P111
[9]  
FAIRCHILD DP, 2002, P INT PIP DREAM C YO
[10]  
Hong K. J., 2006, J R D RES I IND SCI, V20, P211