Austenite stabilization and high strength-elongation product of a low silicon aluminum-free hot-rolled directly quenched and dynamically partitioned steel
Austenite stabilization and high strength-elongation product of a low silicon aluminum-free hot-rolled directly quenched and dynamically partitioned steel
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低硅无铝热轧直接淬火动态配分钢的奥氏体稳定化及高强伸长积
DOI：
10.1016/j.matchar.2015.03.022
复制
发表时间：
2015-06
影响因子：
4.7
通讯作者：
Di Wu
中科院分区：
文献类型：
--
作者：
Zhiping Hu;Fei Peng;Xiaowei Ju;Di Wu
采用热轧直接淬火和动态分配（HDQ&DP）工艺制备低碳低硅无铝钢，得到了体积分数为8.0 ~ 12.0 vol.%的板条马氏体和残余奥氏体组织。通过分析马氏体向奥氏体的碳分配行为和马氏体板条上碳化物的析出—粗化行为，结合可能的热轧变形继承，研究了特殊动态分配过程下低碳低硅无铝钢中奥氏体的稳定机理。结果表明：目前所研究的低硅无铝HDQ&DP钢中令人满意的奥氏体残留量是由于热轧超快冷组织中靠近界面的30-80 nm厚奥氏体区域的高效碳富集和连续冷却过程中避免了严重的碳化物粗化所致。高强度延伸率产品达到26000 MPa%，表明HDQ&DP工艺是开发新一代先进高强度钢的一种有前途的方法。
Microstructures composed of lath martensite and retained austenite with volume fraction between 8.0 vol.% and 12.0 vol.% were obtained in a low-C low-Si Al-free steel through hot-rolling direct quenching and dynamical partitioning (HDQ&DP) processes. The austenite stabilization mechanism in the low-C low-Si Al-free steel under the special dynamical partitioning processes is investigated by analyzing the carbon partition behavior from martensite to austenite and the carbide precipitation-coarsening behavior in martensite laths combining with the possible hot rolling deformation inheritance. Results show that the satisfying retained austenite amount in currently studied low-Si Al-free HDQ&DP steel is caused by the high-efficiency carbon enrichment in the 30–80 nm thick regions of austenite near the interfaces in the hot-rolled ultra-fast cooled structure and the avoidance of serious carbides coarsening during the continuous cooling procedures. The excellent strength-elongation product reaching up to 26,000 MPa% shows that the involved HDQ&DP process is a promising method to develop a new generation of advanced high strength steel.
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DOI：
10.1016/j.msea.2010.02.020
发表时间：
2010-06
影响因子：
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作者：
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影响因子：
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DOI：
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发表时间：
2011-03
期刊：
Metallurgical and Materials Transactions A
影响因子：
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作者：
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通讯作者：
G. A. Thomas;J. Speer;D. Matlock