Abstract
The austenitization behaviors of two high niobium-containing X80 pipeline steels with different titanium contents, including the dissolution of microalloying precipitates and the austenite grain growth, were investigated by using physical-chemical phase analysis method and microstructural observation. The results illustrated that most niobium could be dissolved into austenite during soaking at 1 180 °C, whereas little amount of titanium could be dissolved. It was found that during soaking, the austenite grain growth rate was initially high, and then decreased after soaking for 1 h; moreover, the austenite grains grew up more rapidly at temperatures above 1 180 °C than below 1 180 °C. The results show that the steel with titanium content of 0.016% has a larger austenite grain size than that with titanium content of 0.012% under the same soaking conditions, which is explained by considering the particle size distribution.
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Foundation Item: ltem Sponsored by National Key Technologies Research and Development Program of China (2006BAE03A15)
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Liu, Qy., Sun, Xj., Jia, Sj. et al. Austenitization behaviors of X80 pipeline steel with high Nb and trace Ti treatment. J. Iron Steel Res. Int. 16, 58–62 (2009). https://doi.org/10.1016/S1006-706X(10)60028-3
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DOI: https://doi.org/10.1016/S1006-706X(10)60028-3