文章信息/Info

Title:

Current Status and Future Trend of Micro- and Nano-Structured Ultra-High Strength Steels

作者:

胡鋒1; 周立新2; 張志成2; 張國宏1; 吳開明1

（1.武漢科技大學國際鋼鐵研究院，耐火材料與冶金省部共建國家重點實驗室、高性能鋼鐵材料及其應用湖北
省協同創新中心(2.湖北新冶鋼有限公司

Author(s):

HU Feng2;  ZHOU Lixin1;  ZHANG Zhicheng2;  ZHANG Guohong1;  WU Kaiming1

(1.The State Key Laboratory for Refractory Material and Metallurgy Jointly-Constructed by Ministry-Province,
Hubei Collaborative Innovation Center for Advanced Steels,International Research Institute for Steel Technology,
 Wuhan University of Science and Technology（2.Hubei Xinyegang Steel Co., Ltd.,

關鍵詞:

鋼鐵材料; 相變; 貝氏體; 馬氏體; 殘留奧氏體

DOI:

10.7502/j.issn.1674-3962.2015.07.15

文獻標志碼:

A

摘要:

微納結構超高強度鋼是兼具高強度、高塑性和高韌性的一類重要高性能鋼鐵結構材料。超細馬氏體、貝氏體組織對于其強度起了決定性作用，對塑性和韌性起決定作用的為殘留奧氏體。因此，如何通過調整化學成分和熱處理工藝等手段調控殘留奧氏體微結構，來實現精細組織結構和優良綜合力學性能，成為新一代鋼鐵材料研究領域重要的課題。首先從鋼鐵材料強韌化機制出發，指出微觀組織的精細化及硬相與軟相的合理調控，是發展新一代鋼鐵材料的重要途徑。然后針對近年來發展起來的超級貝氏體鋼、Q&P鋼、Q-P-T鋼等具有微納組織結構的超高強度鋼，從合金設計、熱處理工藝及組織結構與力學性能、磨損性能和疲勞性能的關系等方面進行綜述與分析，最后指出微納結構超高強度鋼有待進一步深入研究與開發的問題。

Abstract:

Micro- and nano-structured steels are high-performance structural steels which have a unique combination of ultra-high strength, high ductility and good toughness. The ultra-high strength of these steels is attributed to sub-micro or nanosized ultra-fine martensitic and bainitic structures, while the ductility and toughness is associated with retained austenite. Therefore, it has become an important scientific problem to achieve fine microstructure and excellent mechanical properties by means of adjustment of the retained austenite through controlling the chemical composition and heat treatment etc. Based on the strengthening and toughening mechanism of iron and steel, the refinement of microstructure and reasonable regulation of hard and soft phases are important way to develop a new generation iron and steel material. The recent development of micro- and nano-structured super bainitic steel, Q&P and Q-P-T steels are reviewed and analyzed from the alloy design, heat treatment process and the relationship between microstructure and mechanical properties, wear properties and fatigue properties. Finally some issues on the micro- and nano-structured ultra high strength steels are pointed out for further research and development.