Acta Metall Sin  2011, Vol. 47 Issue (12): 1541-1549    DOI: 10.3724/SP.J.1037.2011.00382

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EFFECTS OF Ti AND Mn CONTENTS ON THE PRECIPITATE CHARACTERISTICS AND STRENGTHENING MECHANISM IN Ti MICROALLOYED STEELS PRODUCED BY CSP

WANG Changjun 1, YONG Qilong 1, SUN Xinjun 1, MAO Xinping 2, LI Zhaodong 1, YONG Xi 1

1. Institute of Structural Materials, Central Iron and Steel Research Institute, Beijing 100081 2. Guangzhou Zhujiang Steel Limited Liability Company, Guangzhou 510730

WANG Changjun YONG Qilong SUN Xinjun MAO Xinping LI Zhaodong YONG Xi. EFFECTS OF Ti AND Mn CONTENTS ON THE PRECIPITATE CHARACTERISTICS AND STRENGTHENING MECHANISM IN Ti MICROALLOYED STEELS
PRODUCED BY CSP. Acta Metall Sin, 2011, 47(12): 1541-1549.

Abstract References Related Articles Recommended Metrics Download:  PDF(1116KB)  Export:  BibTeX | EndNote (RIS)       Abstract  As an advanced manufacturing technology to produce hot rolled strips, compact strip production (CSP) process was developed at the end of last century and has been widely applied due to its high efficiency and low cost. Compared with the traditional technology, the advantages of CSP technology benefited from the refinement of austenitic grains and precipitation strengthening in the steels. This is because cooling rate is higher during the solidification of slab and the direct charging slab temperature is also higher in the CSP process, resulting in much higher solute contents in the solid solution before hot rolling than expected by the experiences from traditional steel production. So far, the Ti microalloyed steels produced by CSP process already have good performance and have drawn much attention on Ti precipitate behaviors and strengthening mechanism. However, the influence of alloying element Mn on the Ti microalloyed steels produced by CSP, especially the synergistic effect of Mn and Ti, was rarely reported. Therefore, in this work the microstructure and precipitate characteristics of two Ti microalloyed steels with different Ti and Mn contents produced by CSP process were studied by electron backscatter diffraction (EBSD) technology and high resolution transmission electron microscope (HRTEM). The results show that the steel with higher Ti and Mn contents has a higher frequency of small–angle grain boundary. Furthermore, the weight fraction of TiC precipitates with particle size smaller than 10 nm increases significantly, from 7.6% in the lower Ti and Mn steel to 26.1% in the higher Ti and Mn steel. However, the amount of Fe3C precipitates decreases markedly. In addition, the strengthening mechanism analysis of the two tested steels show that grain refinement strengthening and dislocation strengthening make great contribution to the yield strength, while the precipitation strengthening is the primary reason which causes the difference in the strength between two tested steels. Key words:  compact strip production (CSP)      Ti microalloyed steel      strengthening mechanism      mechanical properties      Received:  20 June 2011      Fund:  Supported by National Basic Research Program of China (No.2010CB630805) Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors YU Zhang-Jun YONG Qi-Long XUN Xin-Jun MAO Xin-Beng LI Zhao-Dong URL:  https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00382     OR     https://www.ams.org.cn/EN/Y2011/V47/I12/1541 [1] Yu H, Kang Y L, Wang K L, Fu J, Wang Z B, Liu D L. Mater Sci Eng, 2003; A363: 86 [2] Huo X D, Liu D L, Wang Y L. 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