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(xué)國際鋼鐵研究院，耐火材料與冶金省部共建國家重點(diǎn)實(shí)驗(yàn)室、高性能鋼鐵材料及其應(yīng)用湖北
省協(xié)同創(chuàng)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(guān)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(xiàn)標(biāo)志碼:

A

摘要:

微納結(jié)構(gòu)超高強(qiáng)度鋼是兼具高強(qiáng)度、高塑性和高韌性的一類重要高性能鋼鐵結(jié)構(gòu)材料。超細(xì)馬氏體、貝氏體組織對于其強(qiáng)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(diào)整化學(xué)成分和熱處理工藝等手段調(diào)控殘留奧氏體微結(jié)構(gòu)，來實(shí)現(xiàn)精細(xì)組織結(jié)構(gòu)和優(yōu)良綜合力學(xué)性能，成為新一代鋼鐵材料研究領(lǐng)域重要的課題。首先從鋼鐵材料強(qiáng)韌化機(jī)制出發(fā)，指出微觀組織的精細(xì)化及硬相與軟相的合理調(diào)控，是發(fā)展新一代鋼鐵材料的重要途徑。然后針對近年來發(fā)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(jié)構(gòu)的超高強(qiáng)度鋼，從合金設(shè)計(jì)、熱處理工藝及組織結(jié)構(gòu)與力學(xué)性能、磨損性能和疲勞性能的關(guān)系等方面進(jìn)行綜述與分析，最后指出微納結(jié)構(gòu)超高強(qiáng)度鋼有待進(jìn)一步深入研究與開發(fā)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.