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首页> 外文期刊>Materials Science and Engineering >Ultrafine lamellar microstructure with greatly enhanced strength and ductility of martensite steel via heavily warm rolling of metastable austenite
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Ultrafine lamellar microstructure with greatly enhanced strength and ductility of martensite steel via heavily warm rolling of metastable austenite

机译：超细层状微观结构通过稳定悬浮的亚硫酸盐的钢铁钢大大提高了马氏体钢的强度和延展性

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摘要

Ultrafine lamellar-structured (UFLS) martensite microstructure was fabricated by heavily warm rolling (HWR) of a metastable austenite steel with 93% deformation reduction and subsequent quenching. Microstructure characterization demonstrates that the martensite microstructure after HWR is mainly characterized by ultrafine lamellar comprising of only aligned laths with reduced martensite variants, which is intrinsically different from the hierarchical martensite microstructure in conventional hot-rolling (HR) martensite steels where the basic unit of martensite consists of packets, blocks and laths with 24 crystallographically equivalent variants. Three kinds of typical martensite morphologies were observed. Type Ⅰ: UFLS martensite with lamellar size of less than 200 nm, which is composed of the blocky martensitic lath unit with only one variant; Type Ⅱ: UFLS martensite with lamellar size between 200 and 500 nm, which is composed of several irregular martensite lath units with mainly two variants; Type Ⅲ: UFLS martensite with lamellar size more than 500 nm, which is composed of traditional martensite blocks and laths with six variants. Such martensite microstructures and crystallographic characteristics were well explained by the nucleation-growth mechanism controlled by the elastic strain energy of single variant martensite transformation. Compared to the HR martensite steel, the current UFLS martensitic steel exhibits an excellent strength-ductility combination. This is primarily attributed to the refinement of martensitic microstructures inherited from the refined prior lamellar metastable austenite by HWR.
机译：通过具有93％变形降低和随后的淬火，通过稳定的奥氏体钢（HWR）制造超细层层结构（UFL）马氏体微观结构。微观结构表明HWR后的马氏体微观结构主要是由超细层层的特征在于，仅包含具有降低的马氏体变体的对齐的板条，其与常规热轧（HR）马氏体钢中的分层马氏体微观结构有本质上不同，其中马氏体的基本单元由带有24个晶形上等效变体的数据包，块和车床组成。观察到三种典型的马氏体形态。 Ⅰ型：ufls马氏体具有小于200nm的层状尺寸，由块状马氏体板条单元组成，只有一个变体; Ⅱ型：UFL马氏体，层状大小在200和500nm之间，由几种不规则的马氏体板条单元组成，主要是两个变体; Ⅲ型：ufls马氏体，带状大小超过500 nm，由传统的马氏体块和带有六种变体的车床组成。通过由单变体马氏体转化的弹性应变能量控制的成核 - 生长机制很好地解释了这种马氏体微观结构和晶体特性。与HR马氏体钢相比，目前的UFLS马氏体钢表现出优异的强度 - 延展性组合。这主要归因于通过HWR从精制的先前层层稳定性奥氏体继承的马氏体微观结构的改进。

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  • 来源
    《Materials Science and Engineering》 |2021年第5期|141977.1-141977.12|共12页
  • 作者

    Xinbo Ji; Liming Fu; Han Zheng; Jian Peng; Wei Wang; Aidang Shan;

  • 作者单位

    School of Materials Science and Engineering Shanghai Jiao Tong University 800# Dongchuan Road Shanghai 200240 PR China;

    School of Materials Science and Engineering Shanghai Jiao Tong University 800# Dongchuan Road Shanghai 200240 PR China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration (CISSE) Shanghai 200240 PR China Shanghai Key Laboratory of High Temperature Materials and Precision Forming Shanghai Jiao Tong University Shanghai 200240 PR China;

    School of Materials Science and Engineering Shanghai Jiao Tong University 800# Dongchuan Road Shanghai 200240 PR China;

    School of Materials Science and Engineering Shanghai Jiao Tong University 800# Dongchuan Road Shanghai 200240 PR China;

    Baosteel Research Institute Baoshan Iron and Steel Co. Ltd. 889 Fujin Road Shanghai 201900 PR China;

    School of Materials Science and Engineering Shanghai Jiao Tong University 800# Dongchuan Road Shanghai 200240 PR China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration (CISSE) Shanghai 200240 PR China Shanghai Key Laboratory of High Temperature Materials and Precision Forming Shanghai Jiao Tong University Shanghai 200240 PR China;

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  • 正文语种 eng
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  • 关键词

    Metastable austenite; Ultrafine lamellar structured martensite steel; Microstructure; Lath variant crystallography; Mechanical property;

    机译：亚料奥氏体;超细层层结构马氏体钢;微观结构;Lath变体晶体学;机械性质;

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