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Ultra-low carbon steel pipeline in the formation of acicular ferrite and toughening behavior


According to the fracture in the fracture process carried out by units of , Acicular ferrite Moreover,Salvatore Ferragamo outlet, acicular ferrite in the high density of dislocation on the improvement of strength and toughness also has an important role. Table 2 also shows that a thin film of acicular ferrite plate specimen (No.1, No.2, No.3624 of Materials Research 16 and No.4) and with M / A islands acicular ferrite plate specimen (No.5), has the same chemical composition, but have quite different impact toughness,Beats By Dre Headphones, the former than the latter by about 70J (at 10 ℃). This indicates that the acicular ferrite grain boundaries on the impact properties of the film formed a great contribution. This layer of the grain boundaries are very small size of the film, from the strengthening effect of grain boundary to prevent crack propagation and change the propagation direction, which greatly increase the impact toughness of the material. Table 2 Different types of acicular ferrite, the mechanical properties of Table2Mechanicalpropertiesofacicularferriteindiffe renttypeSampleNo. YieldstrengthTensilestrengths / abElongationReductionofArea-TransverseT-oughness / J / MPaO Institute to develop optimized TMCP process, you can get to acicular ferrite dominated the plate. Acicular ferrite structure on the improvement of the mechanical properties of materials has an important role in the acicular ferrite grain boundaries in a layer of film, this layer of film to improve the strength and toughness of the material plays an important role. References 1K. Yamamoto, S. Matsuda, N. Okmura, Tetsu-to-Hagan6, 70, $ 545 (1984) 2J. Skogsmo, A. Atrens, ActaMetal1. , 42,1139 (1994) 3A. oehlert, A. Aterns, CorrosionSci. , 38,1159 (1996) 4J. Q. Wang, A. A. Atrens, D. R. Cousens, J. Mater. Sci. , 34,1711 (1999) 5G. J. Baczyski, J. J. Jonas, L. E. Collins, Metal1. Mater. Trans. , A, 30A, 3045 (1999) 6T. Tanaka, Int. Met. Rev. , 264,185 f198117M. C. Zhao (Zhao pure), Y. Y. Shan (one silver), J. B. Qu (Qu Kam Bo), K. Yang (Chang Ko), s. Gao (Gao Shan), L. Zhen (Cheng Lei), ActaMetal1. Sin. (Materials Science), 37 L. Lee,GHD Deutschland, S. C. Wang, G. H. Cheng, MaterialsScienceandTechnology, 5,674 (1989) 9I. Madariaga, I_Gutierrez, C. Garcia-deAndres, C. Capdeviala, SciptaMater. , 41,229 (1999) 1OJ. B. Qu (Qu Kam Bo), PostdoctoralDissertation (InstituteofMetalResearch, ChineseAcademyofSciences) 35 (2001) 11J. H. Eom,christian louboutin italia, RISTTechnicalReport, NO. 1-227 A A (1992) 12D. V. Edmonds, R. C. Cochrane, MetallTrans. A, 21A, 1527 (1990)
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