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Influence of Microstructure Constituents on Ductile to Brittle Transition Behavior in Multi-phase Steel Sheets

机译：微观结构成分对多相钢板韧性转型行为的影响

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摘要

The influence of martensite-austenite constituents on the two-step ductile to brittle transition (DBT) behavior of low carbon steel sheets was evaluated using Charpy impact tests with sub-size specimens. Four kinds of steel sheets containing 0-38% volume fraction of MA and polygonal ferrite in the matrix were chosen. Small volumes of MA (i.e.. 2 and 14%) revealed a slightly higher transition temperature between the middle shelf (MS) and lower shelf, T_(ML), compared to sheets with 0% MA. Furthermore, the transition temperature between the upper shelf and MS was not affected. The steel sheet containing 38% MA constituents exhibited a normal one-step DBT curve without MS, and a significantly higher transition temperature than the steel sheets containing 0, 2, and 14% MA. The increase in the austenite volume fraction in MA from 0.6 to 10.2% was not responsible for the DBT behavior, which may depend on the volume fraction of martensite in MA. A model of two-step DBT for multi-phase steel sheets, in which the small volume of MA lowered the fracture stress of the hard structure and elevated T_(ML), was proposed. The T_(ML) depended on the intersection between the fracture stress of the hard structure and the yield stress of the soft structure. In the two-step DBT, the cleavage crack propagation was arrested at ferrite grain boundaries through the MS. A large volume of MA (e.g., all the ferrite grains fully covered) may promote one-step DBT in multi-phase steel sheets, owing to cleavage crack propagation.
机译：使用夏比抗冲击试验评价马氏体 - 奥氏体成分对两步扩展到低碳钢片的脆性转变（DBT）行为的影响，采用夏比试验评价低碳钢板的脆性转变（DBT）行为。选择含有0-38％体积分数的四种钢板，基质中的MA和多边形铁氧体。与0％MA的片相比，小体积的MA（即2和14％）显示中间搁板（MS）和较低搁板之间的过渡温度略高于扁平架和较低搁架之间。此外，上搁板和MS之间的过渡温度不受影响。含有38％MA成分的钢板表现出没有MS的正常一步DBT曲线，并且比含有0,2和14％MA的钢板显着更高的过渡温度。 MA中奥氏体体积分数的增加从0.6〜10.2％不负责DBT行为，这可能取决于MA中马氏体的体积分数。提出了一种用于多相钢板的两步DBT模型，其中提出了小体积的MA降低了硬结构的断裂应力和升高的T_（mL）。 T_（m1）取决于硬结构断裂应力与软结构的屈服应力之间的交叉点。在两步的DBT中，通过MS在铁氧体晶界被捕裂解裂缝繁殖。由于裂解裂纹繁殖，大量的MA（例如，完全覆盖的所有铁氧体颗粒的所有铁氧体晶粒）可以促进多相钢板中的一步DBT。

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  • 来源
    《ISIJ international》 |2021年第3期|1002-1010|共9页
  • 作者

    Hiroyuki KAWATA; Osamu UMEZAWA;

  • 作者单位

    Steel Research Laboratories Nippon Steel Corporation 20-1 Shintomi Futtsu Chiba 293-8511 Japan;

    Faculty of Engineering Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama Kanagawa 240-8501 Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    steel; fracture; ductile to brittle transition; middle shelf;

    机译：钢;断裂;韧性转型;中间架子;

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