热轧薄规格DP600双相钢组织演变
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摘要
采用MMS-200热模拟试验机对DP600双相钢进行双道次压缩,研究带有中间坯补热工序的无头轧制工艺和常规轧制工艺对试验钢奥氏体组织和变形抗力的影响,并在实验室进行了2种工艺条件下的热轧试验。结果表明,具有中间坯补热工序的无头轧制工艺有利于精轧前奥氏体组织的均匀化,降低钢材的变形抗力,试验钢更易于变形;轧制薄规格双相钢时,中间坯补热工序可以抑制马氏体带状组织的生成,试验钢具有较高的断后伸长率,马氏体含量的增加提高了试验钢的抗拉强度,力学性能满足DP600的标准要求。该研究结果为无头轧制工艺开发薄规格DP600双相钢奠定了理论基础。
The effects of endless rolling process with intermediate billet reheating process and conventional rolling process on the austenite microstructure and deformation resistance of DP600 dual-phase steel were studied by two-pass reduction experiments on a MMS-200 thermalmechanical simulator. The hot rolling experiments of the two processes were carried out in the laboratory. The results show that the endless rolling process with intermediate billet reheating process is beneficial to the homogenization of austenite grains before finishing rolling and the reduction of deformation resistance, which makes the experimental steel more easily deformed. When rolling the thin-gauge dual-phase steel, the intermediate billet reheating process can inhibit the formation of martensite banded microstructures and increase the martensite volume fraction. Under this process, the experimental steel obtained higher elongation and tensile strength, and its mechanical properties can meet the requirements of DP600 standard. The research results laid a theoretical foundation for the development of thin-gauge DP600 dual-phase steel by endless rolling process.
The effects of endless rolling process with intermediate billet reheating process and conventional rolling process on the austenite microstructure and deformation resistance of DP600 dual-phase steel were studied by two-pass reduction experiments on a MMS-200 thermalmechanical simulator. The hot rolling experiments of the two processes were carried out in the laboratory. The results show that the endless rolling process with intermediate billet reheating process is beneficial to the homogenization of austenite grains before finishing rolling and the reduction of deformation resistance, which makes the experimental steel more easily deformed. When rolling the thin-gauge dual-phase steel, the intermediate billet reheating process can inhibit the formation of martensite banded microstructures and increase the martensite volume fraction. Under this process, the experimental steel obtained higher elongation and tensile strength, and its mechanical properties can meet the requirements of DP600 standard. The research results laid a theoretical foundation for the development of thin-gauge DP600 dual-phase steel by endless rolling process.
引文
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[17] Arvedi G,Mazzolari F,Siegl J,et al.Arvedi ESP first thin slab endless casting and rolling results[J].Ironmaking and Steelmaking,2010,37(4):271.
[2] 关春立,韩立海.硼微合金化钢以热轧代替冷轧产品的开发[J].炼钢,2013,29(1):28.(Guan C L,Han L H.Development of hot rolling product as the substitution of cold rolling product by boron micro-alloy technology[J].Steelmaking,2013,29(1):28.)
[3] Reip C P,Hennig W,Kempken J,et al.Development of CSP? processed high strength pipe steels[J].Materials Science Forum,2005,500-501:287.
[4] 张亮洲.薄板坯连铸连轧生产65Mn高碳高强钢的实践[J].金属材料与冶金工程,2009,37(4):15.(Zhang L Z.Practice on 65Mn high carbon high strength steel strip produced by compact strip production[J].Metal Materials and Metallurgy Engineering,2009,37(4):15.)
[5] Reip C P,Klinkenberg C,Tong L,et al.Potential of hot rolled dual phase steel from compact strip production CSP (R) in automotive applications[J] Materials Science Forum,2012,706-709:2278.
[6] Zhao Z Z,Liu J.Analysis on microstructure characteristics and precipitation behavior of automobile beam steels produced by compact strip production[J].Chinese Journal of Iron and Steel,2010,17(3):56.
[7] 干勇,李光瀛,马鸣图,等.先进短流程—深加工新技术与高强塑性汽车构件的开发[J].轧钢,2015,32(4):1.(Gan Y,Li G Y,Ma M T,et al.Development of advanced compact steel process and deep working technology for high-strength-ductilitty auto-parts[J].Steel Rolling,2015,32(4):1.)
[8] 马鸣图,吴宝榕.双相钢:物理和力学冶金 [M].2版.北京:冶金工业出版社,2009.(Ma M T,Wu B R.Dual Phase Steel:Physical and Mechanical Metallurgy [M].2nd Edition.Beijing:Metallurgical Industry Press,2009.)
[9] Farabi N,Chen D L,Zhou Y.Microstructure and mechanical properties of laser welded dissimilar DP600/DP980 dual-phase steel joints[J].Journal of Alloys and Compounds,2011,509(3):982.
[10] Kadkhodapour J,Butz A,Ziaei R S.Mechanisms of void formation during tensile testing in a commercial,dual-phase steel[J].Acta Materialia,2011,59(7):2575.
[11] Khan M I,Kuntz M L,Su P,et al.Resistance and friction stir spot welding of DP600:A comparative study[J].Science and Technology of Welding and Joining,2013,12(2):175.
[12] Ma C,Chen D L,Bhole S D,et al.Microstructure and fracture characteristics of spot-welded DP600 steel[J].Materials Science and Engineering,2008,485A(1):334.
[13] 时晓光,刘仁东,韩斌,等.热轧双相钢DP600组织性能的研究[J].钢铁研究学报,2010,22(4):39.(Shi X G,Liu R D,Han B,et al.Study on Microstructures and properties of hot rolling dual phase DP600 steels[J].Journal of Iron and Steel Research,2010,22(4):39)
[14] 黄全伟,宋仁伯,周乐育,等.700 MPa级热轧双相钢的组织和性能[J].钢铁研究学报,2009,21(8):21.(Huang Q W,Song R B,Zhou L Y,et al.Microstructure and property of 700 MPa grade hot rolled dual phase steel[J].Journal of Iron and Steel Research,2009,21(8):21.)
[15] 康永林,朱国明.热轧板带无头轧制技术[J].钢铁,2012,47(2):1.(Kang Y L,Zhu G M.Hot strip endless rolling technology[J].Iron and Steel,2012,47(2):1.)
[16] Arvedi G,Mazzolari F,Bianchi A,et al.The Arvedi endless strip production line (ESP):from liquid steel to hot-rolled coil in seven minutes[J].Revue De Métallurgie,2008,105(7):398.
[17] Arvedi G,Mazzolari F,Siegl J,et al.Arvedi ESP first thin slab endless casting and rolling results[J].Ironmaking and Steelmaking,2010,37(4):271.