Acta Metall Sin  2012, Vol. 48 Issue (2): 176-182    DOI: 10.3724/SP.J.1037.2011.00476

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EFFECTS OF RAPID HEATING CONTINUOUS ANNEALING ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF ULTRA HIGH–STRENGTH TRIP–AIDED STEEL

XU Yunbo 1, HOU Xiaoying 1, WANG Yeqin 2, WU Di 1

1. State Key Laboratory of Rolling Technology and Automation, Northeast University, Shenyang 110819 2. Laiwu Iron and Steel Group Co. Ltd., Laiwu 271104

XU Yunbo HOU Xiaoying WANG Yeqin WU Di. EFFECTS OF RAPID HEATING CONTINUOUS ANNEALING ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF ULTRA HIGH–STRENGTH TRIP–AIDED STEEL. Acta Metall Sin, 2012, 48(2): 176-182.

Abstract References Related Articles Recommended Metrics Download:  PDF(1704KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The effects of rapid heating continuous annealing on microstructure and mechanical properties of ultra–high strength and low silicon TRIP steel containing phosphorus and vanadium were investigated. The results show that the yield and tensile strengths are increased with increasing intercritical annealing temperature during rapid continuous annealing. However, the intercritical annealing temperature can not increase blindly to ensure its excellent combined mechanical properties. When the heating rate is 80 ℃/s and intercritical annealing temperature is 880 ℃, the retained austenite not only contains fine blocky structure, but also a large amount of interlath retained austenite films. A great amount of V(C, N) precipitates exists within ferritic matrix, and the sizes of most of the precipates are in the range from 4 to 9 nm. The tested steel has excellent mechanical properties: Rm=1010MPa, RP0.2=690MPa, δ=23.6%, n=0.27, r=1.17, the product of strength and ductility (Rm×δ) is 23836 MPa·%. If the intercritical annealing temperature is too high or too low, the comprehensive  mechanical properties will be deteriorated since the volume fraction of retained austenite reduces,  morphology changes and its size increase. Key words:  TRIP steel containing vanadium      rapid heating      continuous annealing      mechanical property      retained austenite      Received:  22 July 2011      Fund:  Supported by National Natural Science Foundation of China (No.51174059), National Basic Research Program of China (No.2011CB606306) and Fundamental Research Funds for the Central Universities (No.N110407003) Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors XU Yun-Bei HOU Xiao-Yang YU Ye-Qi WU Di URL:  https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00476     OR     https://www.ams.org.cn/EN/Y2012/V48/I2/176 [1] Balk S C, Kim S, Jin Y S, Kwon O. ISIJ Int, 2001; 41: 290 [2] Thomson R C, Miller M K. Acta Mater, 1998; 46: 2203 [3] Kim S J, Lee C G, Lee T H, Oh C S. ISIJ Int, 2002; 42: 1452 [4] Pereloma E V, Russell K F, Miller M K, Timokhina I B. Scr Mater, 2008; 58: 1078 [5] Pereloma E V, Timokhina I B, Hodgson P D. 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