工程科学学报2017，Vol.39Issue(12)：1835-1843,9.DOI:10.13374/j.issn2095-9389.2017.12.009
送装工艺对板坯再加热过程奥氏体晶粒细化的影响
Effect of charging processes on the austenite grain refinement of continuously cast slabs during reheating
摘要
Abstract
The thermal regime and structural control between continuous caster offline and a reheat furnace has a significant im-pact on the cracking problem occurring during hot charging or hot rolling. The effect of the charging process on the characteristics of austenite transformation and sizes of reheated grains was experimentally analyzed using thermal simulation. The in situ observation re-sults using a high-temperature confocal laser scanning microscope shows that film-like ferrite and Widmanst?tten ferrite are present along the grain boundary with amounts of retained austenite when hot charged at 700℃ in the dual phase region for J55 steel, and the size and location of the austenitic grain remain constant after reheating to 1200℃. When warm charged at 600℃ in the single phase region, large amounts of ferrite and pearlite are observed, and austenite grains are clearly refined after reheating to 1200℃. It is also found that the austenitic grain can only be visibly refined when the transformed ferrite fraction is higher than 70% for SS400 steel hot charged at different temperatures using a muffle furnace. The grain refinement is more obvious when the transformed ferrite fraction is higher than the critical value.关键词
送装工艺/奥氏体晶粒/热装温度/晶粒细化Key words
charging process/austenite grain/hot-charging temperature/grain refinement分类
矿业与冶金引用本文复制引用
兰鹏,杜辰伟,张家泉,马炳川..送装工艺对板坯再加热过程奥氏体晶粒细化的影响[J].工程科学学报,2017,39(12):1835-1843,9.基金项目
中央高校基本科研业务费专项资金资助项目(FRF-TP-15-066A1) （FRF-TP-15-066A1）
国家自然科学基金资助项目(51604021) （51604021）
北京市自然科学基金资助项目(2174077) （2174077）
