科研之友
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摘要
The kinetics of abnormal grain growth in austenite was examined in microalloyed steel containing Nb and Ti additions. Abnormal grain growth was triggered by the dissolution of microalloyed carbonitrides during reheating. The progress of abnormal grain growth was determined at 1200, 1300 and 1400 degrees C. Post-abnormal grain growth was defined as the grain growth process which takes place once all of the original fine grains have been consumed by the abnormal grains. The post-abnormal grain growth kinetics appeared to follow a simple parabolic law. The parabolic constant needed to describe post-abnormal grain growth in the present alloy was three times larger than that needed to describe normal grain growth in a similar alloy without Nb and Ti additions. The possible origins of this effect are briefly discussed.
- 出版日期2011-10
