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首页> 外文期刊>Materials Science and Engineering >Microstructure-property relationship in a high strength-high toughness combination ultra-heavy gauge offshore plate steel: The significance of multiphase microstructure
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Microstructure-property relationship in a high strength-high toughness combination ultra-heavy gauge offshore plate steel: The significance of multiphase microstructure

机译：高强度-高韧性组合超重规格海上板材的组织与性能关系：多相组织的意义

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摘要

We elucidate here the microstructure-property relationship in high strength and high toughness 60 mm thick ultra-heavy gauge plate steels characterized by ferrite-bainite multi-phase microstructure and compare with the conventional bainitic microstructure. Pilot-scale results indicated that high yield strength of -486-508 MPa with high ductility of ～10% in uniform elongation, low yield to tensile (Y/T) ratio of ～0.74-0.77, excellent low temperature toughness of ～186-228 J at -60 ℃ and good weldability are obtained in a multi-phase steel through combination of controlled rolling and accelerated cooling. The multi-phase microstructure steel consisted of quasi-polygonal ferrite and lath bainite with the corresponding phase proportion of 3:2 and 2:3 at 1/4 thickness (1/4 t) and 1/2 thickness (1/2 t) locations, respectively. The positive impact of multi-phase microstructure on ductility, Y/T ratio, toughness and weldability were attributed to the following aspects: (a) results from Crussard-Jaoul (C-J) analysis indicated that the soft ferrite phase in the multi-phase micro-structure favorably modifies the work hardening behavior and results in high ductility and low Y/T ratio; (b) multi-phase microstructure is beneficial in enhancing toughness by enhancing initiation energy for nucleation of crack; (c) multi-phase microstructure improves the toughness of heat affected zone by altering the size and distribution of martensite/austenite (M/A) constituent.
机译：我们在此阐明以铁素体-贝氏体多相组织为特征的60 mm厚超高规格钢板在高强度和高韧性中的组织与性能的关系，并与常规贝氏体组织进行比较。中试结果表明，高屈服强度为-486-508 MPa，延展性均匀，延展性约为-10％，屈服抗拉强度（Y / T）比低至0.74-0.77，低温韧性约为186-通过控制轧制和加速冷却相结合，在多相钢中获得了-60℃时228 J的良好焊接性能。多相显微组织钢由准多边形铁素体和板条贝氏体组成，相应的相比为3：2和2：3，厚度为1/4（1/4 t），厚度为1/2（1/2 t）位置。多相组织对延性，Y / T比，韧性和可焊性的积极影响归因于以下几个方面：（a）Crussard-Jaoul（CJ）分析的结果表明，多相组织中的软铁素体相-结构有利地改变了加工硬化行为，并导致高延展性和低Y / T比； （b）多相显微组织有利于通过增加裂纹成核的起始能量来提高韧性； （c）多相微结构通过改变马氏体/奥氏体（M / A）成分的大小和分布来提高热影响区的韧性。

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  • 来源
    《Materials Science and Engineering》 |2017年第24期|212-219|共8页
  • 作者

    X.J. Sun; S.F. Yuan; Z.J. Xie; L.L. Dong; C.J. Shang; R.D.K. Misra;

  • 作者单位

    School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 China;

    School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 China;

    Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083 China;

    School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 China;

    Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083 China;

    Department of Metallurgical, Materials and Biomedical Engineering, University of Texas at El Paso, El Paso, TX 79968, USA;

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  • 正文语种 eng
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  • 关键词

    Heavy thickness; Low yield ratio; Offshore steel; Multi-phase; Mechanical properties; HAZ;

    机译：厚厚的;良率低;离岸钢铁;多相机械性能热影响区;

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