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| EFFECTS OF AGING ON MICROSTRUCTURE AND MECHANICAL PROPERTY OF ULTRALOW CARBON ACICULAR FERRITE STEEL |
| GUO Aimin 1;2; ZOU Dehui1;2; YI Lunxiong3; DONG Hanxiong1; LI Pinghe1; LIU Kai4; WU Kaiming4 |
1.Institute of Research; Wuhan Iron and Steel (Group) Company;Wuhan 430080
2.School of Power and Mechanical Engineering; Wuhan University; Wuhan 430072
3.China Zhongtie Major Bridge Reconnaissance & Design Institute o. Ltd.; Wuhan 430050
4.Hubei Province Key Laboratory of Systems Science in Metallurgical Processing;Wuhan University of Science and Technology; Wuhan 430081 |
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Cite this article:
GUO Aimin ZOU Dehui YI Lunxiong DONG Hanxiong LI Pinghe LIU K WU Kaiming. EFFECTS OF AGING ON MICROSTRUCTURE AND MECHANICAL PROPERTY OF ULTRALOW CARBON ACICULAR FERRITE STEEL. Acta Metall Sin, 2009, 45(4): 390-395.
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Abstract The effects of aging temperature on the microstructure and mechanical property of ultra–low–carbon acicular ferrite steel was studied by utilizing OM, SEM, TEM, tensile and impact tests. The strength of the specimen is not obviously changed due to little precipitating amount of the second phase and little coarsening of microstructure when aged from 450 to 500 ℃. The rapid increase in strength appears and is attributed to the dispersive precipitations of ε–Cu and Nb(C, N) when aged from 550 to 650℃. When aged above 650 ℃, the abrupt decrease in strength appears and is caused by over–aging, i.e., the coalescence of ferrite plates and coarsening of precipitates. When aged at 750℃ (in two–phase field), the toughness decreases abruptly, which is related to the formation of martensite/austenite (M/A) ithigher carbon content during cooling.
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Received: 28 May 2007
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| Fund: Supported by National Basic Research Program of China (No.2004CB19102) |
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