孙田浩,邓想涛,杨晓松,王昭东

• 1:东北大学轧制技术及连轧自动化国家重点实验室

摘要(Abstract)：

采用超快冷返温轧制工艺制备了一种500 MPa级超低碳Nb-Ti微合金梯度结构钢板。利用全自动相变仪、微观硬度计、电子万能试验机、光学显微镜、扫描电镜(SEM)、电子背散射衍射(EBSD)等研究了梯度结构钢板组织演变规律及力学性能，并在-80～20℃下对钢板表层和心部进行了低温冲击试验。结果表明：钢板呈现出表层超细晶铁素体组织到心部粗晶铁素体组织的晶粒尺寸梯度变化。由于细晶强化的作用，钢板表层强度得到提升，屈服强度较心部增加41 MPa;表层的断后伸长率为35%,要高于心部的31%。表层晶粒细化和心部大量大角度晶界的存在使得钢板具有优异的低温韧性，-80℃下表层和心部的冲击吸收能量分别可以达到106和90 J。

关键词(KeyWords)： 钢;梯度结构;微观组织;低温冲击韧性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51874089)

作者(Author): 孙田浩,邓想涛,杨晓松,王昭东

DOI: 10.13289/j.issn.1009-6264.2023-0012

参考文献(References)：

• [1] Stroeve J C,Markus T,Biosvert L,et al.Changes in arctic melt season and implications for sea ice loss[J].Geophysiacal Letters,2014,41(4):1216-1225.
• [2] 王红涛，田勇，叶其斌，等.极寒环境下厚规格船舶用钢的发展[J].轧钢，2018,35(5):48-53.WANG Hong-tao,TIAN Yong,YE Qi-bin,et al.Development of heavy ship plate in extremely cold environment[J].Steel Rolling,2018,35(5):48-53.
• [3] 李毅.梯度结构金属材料研究进展[J].中国材料进展，2016,35(9):658-665.LI Yi.Research progress of gradient structure metal materials[J].Materials Progress in China,2016,35(9):658-665.
• [4] Lu K.Making strong nanomaterials ductile with gradients[J].Science,2014,345(6203):1455-1456.
• [5] Lu K.Stabilizing nanostructures in metals using grain and twin boundary architectures[J].Nature Reviews Materials,2016,1(5):1-29.
• [6] Meyers M A,Chen P Y,Lin Y M,et al.Biological materials:Structure and mechanical properties[J].Progress in Materials Science,2008,53(1):1-206.
• [7] Wu X L,Yang M X,Yuan F P,et al.Combining gradient structure and TRIP effect to produce austenite stainless steel with high strength and ductility[J].Acta Materialia,2016,112:337-346.
• [8] Lefevre-Schlick F,Bouaziz O,Brechet Y,et al.Compositionally graded steels:The effect of partial decarburization on the mechanical properties of spherodite and pearlite[J].Materials Science and Engineering A,2008,491(1):80-87.
• [9] Wu X,Jiang P,Chen L,et al.Extraordinary strain hardening by gradient structure[J].Proceedings of the National Academy of Sciences,2014,111(20):7197-7201.
• [10] Roland T,Retraint D,Lu K,et al.Fatigue life improvement through surface nanostructuring of stainless steel by means of surface mechanical attrition treatment[J].Scripta Materialia,2006,54(11):1949-1954.
• [11] Long Q Y,Lu J X,Fang T H.Microstructure and mechanical properties of AISI 316L steel with an inverse gradient nanostructure fabricated by electro-magnetic induction heating[J].Materials Science and Engineering A,2019,751:42-50.
• [12] Li X Y,Lu L,Li J G,et al.Mechanical properties and deformation mechanisms of gradient nanostructured metals and alloys[J].Nature Reviews Materials,2020,5(9):706-723.
• [13] 杨晓松，孙田浩，邓想涛，等.梯度结构钢铁材料的研究进展[J].材料热处理学报，2022,43(1):1-9.YANG Xiao-song,SUN Tian-hao,DENG Xiang-tao,et al.Research progress of gradient structure steel materials[J].Transactions of Materials and Heat Treatment,2022,43(1):1-9.
• [14] Hidesato M,Toshiei H,Tadashi I.Metallurgical features of steel plates with ultra fine grains in surface layers and their formation mechanism[J].ISIJ International,1999,39(5):477-485.
• [15] Song Y L,Li C S,Ma B,et al.Microstructure and mechanical properties of Fe-18Mn-18Cr-0.5N austenitic nonmagnetic stainless steel in asymmetric hot rolling[J].Journal of Materials Engineering and Performance,2017,26(5):2430-2438.
• [16] 沈鑫珺.轧制与水冷耦合的控制轧制技术研究[D].沈阳：东北大学，2017.SHEN Xin-jun.Study of rolling and water-cooling coupled control rolling process[D].Shenyang:Northeastern University,2017.
• [17] 赵四新，姚连登，赵小婷.表层超细晶厚钢板的研制[J].世界钢铁，2009,9(5):18-22.ZHAO Si-xin,YAO Lian-deng,ZHAO Xiao-ting.Development of heavy plate with ultra fine grained surface layer[J].World Iron & Steel,2009,9(5):18-22.
• [18] Park H K,Ameyama K,Yoo J,et al.Additional hardening in harmonic structured materials by strain partitioning and back stress[J].Materials Research Letters,2018,6(5):261-267.
• [19] Yang M X,Pan Y,Yuan F P,et al.Back stress strengthening and strain hardening in gradient structure[J].Materials Research Letters,2016,4(3):145-151.
• [20] Ovid’ko I A,Valiev R Z,Zhu Y T.Review on superior strength and enhanced ductility of metallic nanomaterials[J].Progress in Materials Science,2018,94:462-540.
• [21] Cheng Z,Zhou H F,Lu Q H,et al.Extra strengthening and work hardening in gradient nanotwinned metals[J].Science Foundation in China,2018,26(4):23.
• [22] Hughes D A,Hansen N,Bammann D J.Geometrically necessary boundaries,incidental dislocation boundaries and geometrically necessary dislocations[J].Scripta Materialia,2002,48(2):147-153.
• [23] Estrin Y,Beygelzimer Y,Kulagin R,et al.Architecturing materials at mesoscale:some current trends[J].Materials Research Letters,2021,9(10):399-421.
• [24] 刘志华.非均质铜及铜锌合金的力学行为研究[D].太原：太原理工大学，2017.LIU Zhi-hua.The mechanical behavior of heterogeneous Cu and Cu-Zn alloy[D].Taiyuan:Taiyuan University of Technology,2017.
• [25] 杨小龙.低碳微合金钢板的高强高韧性能及组织织构[D].沈阳：东北大学，2017.YANG Xiao-long.High strength,high toughness,microstructure and texture of low carbon microalloyed steel[D].Shenyang:Northeastern University,2017.
• [26] 金池.梯度结构Ti-Nb低碳微合金钢板制备及其强韧性能研究[D].沈阳：东北大学，2019.JIN Chi.Research on fabrication of low carbon ti-nb microalloyed steel plate with gradient structure and the correspongding strength and toughness property[D].Shenyang:Northeastern University,2019.

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