送裝工藝對板坯再加熱過程奧氏體晶粒細化的影響

蘭鵬; 杜辰偉; 張家泉; 馬炳川

doi:10.13374/j.issn2095-9389.2017.12.009

送裝工藝對板坯再加熱過程奧氏體晶粒細化的影響

doi: 10.13374/j.issn2095-9389.2017.12.009

1) 北京科技大學冶金與生態工程學院, 北京 100083
2) 北京航星機械制造有限公司, 北京 100013
3) 中國重型機械研究院成都分院, 成都 610021

基金項目:

中央高校基本科研業務費專項資金資助項目（FRF-TP-15-066A1）；國家自然科學基金資助項目（51604021）；北京市自然科學基金資助項目（2174077）

詳細信息

中圖分類號: TG142.1
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出版歷程
- 收稿日期: 2017-06-23

Effect of charging processes on the austenite grain refinement of continuously cast slabs during reheating

1) School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
2) Beijing Hangxing Technology Development Co., Ltd., Beijing 100013, China
3) China National Heavy Machinery Research Institute Co., Ltd., Chengdu 610021, China

摘要

摘要: 連鑄坯下線至加熱爐的溫度制度及其表層組織演變與熱送或粗軋裂紋密切相關.基于熱模擬實驗分析了送裝工藝對奧氏體轉變特征和再加熱晶粒尺寸的影響.高溫共聚焦激光掃描顯微鏡原位觀察表明，含Nb J55鋼在雙相區700℃熱裝時，組織為晶界膜狀先共析鐵素體、魏氏體和大量殘留奧氏體，再加熱至1200℃，奧氏體晶粒大小、位置都不變；單相區600℃溫裝時，組織為大量鐵素體+珠光體，再加熱至1200℃時，奧氏體晶粒明顯細化.馬弗爐模擬SS400鋼雙相區不同熱裝溫度發現，鐵素體轉變量至少達70%時才可細化再加熱后的奧氏體晶粒.在臨界轉變量以上，基體中鐵素體轉變量越多晶粒細化程度越明顯.
- 送裝工藝 /
- 奧氏體晶粒 /
- 熱裝溫度 /
- 晶粒細化
Abstract: The thermal regime and structural control between continuous caster offline and a reheat furnace has a significant impact 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 results using a high-temperature confocal laser scanning microscope shows that film-like ferrite and Widmanstätten 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.
- charging process /
- austenite grain /
- hot-charging temperature /
- grain refinement

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參考文獻(13)

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