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DESIGN OF LOW CARBON DUAL-PHASE STEELS FOR HIGH STRENGTH WIRE.

机译：高强度线材低碳双相钢的设计。

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摘要

An investigation has been made to produce high strength wire from low carbon dual-phase steel using its high strain hardening rate and superior formability. This dual-phase steel wire is an alternative to conventional high strength wire, which is produced by cold drawing high carbon pearlitic steel rod to large strains with several intermediate annealing or patenting heat treatments.; Some alloy design considerations were assessed to develop a dual-phase steel suitable for cold drawing into high strength wire. The effects of metallurgical variables such as martensite particle size, shape, volume fraction and ferrite grain size on controlling the strength-ductility balance were described, and their role during the wire drawing process characterized.; The dual-phase steel of composition Fe-2% Si-0.1% C, which has been developed according to the selected design guidelines, was found to be the most promising material for high strength wire application. This steel could be continuously drawn to strength levels found in commercial high carbon pearlitic wires without any intermediate patenting treatments during the drawing process, resulting in reductions of production cost and operation complexity. The attractive properties found in the silicon containing dual-phase steel are attributed to its microstructural feature; fine, fibrous and disconnected lath martensite particles in a fine ferrite matrix.; This desirable dual-phase microstructure can be produced by austenitizing and quenching to form 100% martensite, followed by two phase annealing and subsequent quenching or in the as-rolled condition by rolling in the two phase region and quenching after controlled deformation in the austenite region. It is recommended that the quench after two phase annealing or finish rolling be as rapid as possible to prevent austenite pool shrinkage or decomposition prior to its transformation to martensite.
机译：已经进行了利用低碳双相钢的高应变硬化率和优异的可成形性来生产高强度焊丝的研究。这种双相钢丝是传统高强度钢丝的替代品，后者是通过几次中间退火或专利热处理将高碳珠光体钢棒冷拔成大应变而制成的。评估了一些合金设计考虑因素，以开发适用于冷拔成高强度钢丝的双相钢。描述了冶金变量（例如马氏体粒度，形状，体积分数和铁素体晶粒尺寸）对控制强度-延展性平衡的影响，并描述了它们在拉丝过程中的作用。根据选定的设计指南开发的成分为Fe-2％Si-0.1％C的双相钢是高强度焊丝应用中最有希望的材料。可以在拉伸过程中不经过任何中间专利处理的情况下，将这种钢连续拉伸至商用高碳珠光体钢丝中发现的强度水平，从而降低了生产成本和操作复杂性。含硅双相钢的吸引力在于其微观结构特征。在细的铁素体基体中的细的，纤维状的和不连续的板条马氏体颗粒。这种理想的双相组织可以通过奥氏体化和淬火以形成100％马氏体，然后进行两相退火并随后进行淬火或在轧制条件下通过在两相区域轧制并在奥氏体区域进行受控变形后淬火来生产。建议两相退火或精轧后尽快淬火，以防止奥氏体熔池在转变成马氏体之前收缩或分解。

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  • 作者

    AHN, JAE-HWAN.;

  • 作者单位

    University of California, Berkeley.;

  • 授予单位 University of California, Berkeley.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 1987
  • 页码 149 p.
  • 总页数 149
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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