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| Austenitization Behaviors of X80 Pipeline Steels With High Nb and Micro-Ti Treatment |
LIU Qing-you SUN Xin-jun JIA Shu-jun ZHANG Lu-lin HUANG Guo-jian REN Yi |
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Abstract The austenitization behaviors of two high Nb-containing X80 pipeline steels with different Ti contents, including the dissolution of microalloying precipitates and the austenite grain growth behaviors, were investigated by using physical-chemical phase analysis method and optimal microstructure observation. The results illustrate that most Nb can be dissolved into austenite during the soaking at 1180��, but very little amount of Ti can be dissolved. It is found that during soaking, the austenite grain growth rate is initially high, and then it decreases after 1h soaking; moreover, the austenite grains grow up more rapidly at temperatures above 1180�� than at temperatures below 1180��. It is shown that the steel with 0.016%Ti content has a larger austenite grain size than the steel with 0.012%Ti under the same soaking conditions, which has been explained by considering the particle size distribution.
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Received: 28 August 2008
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2009, Vol. 16 
