微纳结构超高强度钢的现状与发展

发布时间：2019-05-28 21:24

【摘要】：微纳结构超高强度钢是兼具高强度、高塑性和高韧性的一类重要高性能钢铁结构材料。超细马氏体、贝氏体组织对于其强度起了决定性作用,对塑性和韧性起决定作用的为残留奥氏体。因此,如何通过调整化学成分和热处理工艺等手段调控残留奥氏体微结构,来实现精细组织结构和优良综合力学性能,成为新一代钢铁材料研究领域重要的课题。首先从钢铁材料强韧化机制出发,指出微观组织的精细化及硬相与软相的合理调控,是发展新一代钢铁材料的重要途径。然后针对近年来发展起来的超级贝氏体钢、QP钢、Q-P-T钢等具有微纳组织结构的超高强度钢,从合金设计、热处理工艺及组织结构与力学性能、磨损性能和疲劳性能的关系等方面进行综述与分析,最后指出微纳结构超高强度钢有待进一步深入研究与开发的问题。
[Abstract]:Ultra-high strength steel with micro-nano structure is an important kind of high performance steel structure material with high strength, high plasticity and high toughness. The microstructure of ultra-fine martensite and bainite plays a decisive role in its strength, and retained Austenite plays a decisive role in plasticity and toughness. Therefore, how to adjust the microstructure of retained Austenite by adjusting chemical composition and heat treatment process to achieve fine microstructure and excellent comprehensive mechanical properties has become an important topic in the field of new generation iron and steel materials. Based on the strengthening and toughness mechanism of iron and steel materials, it is pointed out that the refinement of microstructure and the reasonable regulation of hard phase and soft phase are important ways to develop a new generation of iron and steel materials. Then, for super bainitic steel, QP steel, Q-P-T steel and other ultra-high strength steel with micro-nano structure developed in recent years, from alloy design, heat treatment process, microstructure and mechanical properties, The relationship between wear properties and fatigue properties is reviewed and analyzed. finally, it is pointed out that the problems of ultra-high strength steel with micro-nano structure need to be further studied and developed.
【作者单位】：武汉科技大学国际钢铁研究院耐火材料与冶金省部共建国家重点实验室高性能钢铁材料及其应用湖北省协同创新中心;湖北新冶钢有限公司;
【基金】：武汉市国际科技合作项目(2014030709020307) 国家科技部863项目(2012AA03A504) 湖北省重点新产品新工艺研究开发项目(2012 BAA14005)
【分类号】：TG142.1

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