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Fracture behavior of nanostructured heavily cold drawn pearlitic steel wires before and after annealing

机译：纳米结构重冷拉伸珠光体钢丝退火前后的断裂行为

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摘要

In situ micro-cantilever fracture testing is used to demonstrate changes in fracture behavior of nanostructured, heavily cold drawn pearlitic steel wires as a function of drawing strain and annealing conditions. It is shown that these steels exhibit a sharp transition in fracture behavior between a drawing strain of 320% and 520% with a drop in fracture toughness from 7.5 to 4 MPam~(1/2). This is confirmed from the nature of fracture which is stable with some degree of plasticity at drawing strains below 320% and changes to catastrophic cleavage fracture at drawing strains of 420% and above. This transition and associated brittleness is attributed to structural (cementite decomposition and strain induced increase in tetragonality) and microstructural (increasing nanocrys-tallinity and dislocation density) evolution that these steels undergo at higher drawing strains. On heat treating the 420% strained sample, brittle cleavage fracture continues for low temperature (200 ℃) annealing with no visible changes in microstructure, while crack growth is suppressed and large-scale plasticity is recovered for high temperature (500 ℃) annealing with accompanying grain coarsening, and re-precipitation of spherodized cementite at grain boundaries.
机译：原位微悬臂梁断裂试验用于证明纳米结构的，严重冷拔的珠光体钢丝的断裂行为随拉伸应变和退火条件的变化。结果表明，这些钢在拉伸应变为320％和520％之间表现出明显的断裂行为转变，断裂韧性从7.5降低到4 MPam〜（1/2）。从断裂的性质证实了这一点，该断裂的性质在320％以下的拉伸应变下具有一定程度的可塑性，并且在420％以上的拉伸应变下变为灾难性断裂断裂。这种转变和相关的脆性归因于这些钢在较高的拉伸应变下所经历的组织结构（胶凝体分解和应变诱导的四方性增加）和微观结构（纳米晶的斜度和位错密度增加）的演变。在对420％应变样品进行热处理时，低温（200℃）退火仍会发生脆性断裂，而显微组织没有明显变化，而高温（500℃）退火则伴随裂纹的出现而抑制了裂纹扩展并恢复了大规模可塑性。晶粒粗化，球化渗碳体在晶界处再沉淀。

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  • 来源
    《Materials Science and Engineering》 |2017年第7期|164-171|共8页
  • 作者

    B.N. Jaya; S. Goto; G. Richter; C. Kirchlechner; G. Dehm;

  • 作者单位

    Max Planck Institutfuer Eisenforschung GmbH, Duesseldorf, Germany;

    Max Planck Institutfuer Eisenforschung GmbH, Duesseldorf, Germany,Akita University, Tegata Gakuencho, Akita 010-8502, Japan;

    Max Planck Institute for Intelligent Systems, Stuttgart, Germany;

    Max Planck Institutfuer Eisenforschung GmbH, Duesseldorf, Germany,Department of Material Physics, University of Leoben, Leoben, Austria;

    Max Planck Institutfuer Eisenforschung GmbH, Duesseldorf, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Pearlitic steel; Nanocrystalline; Wire drawing; Fracture; Micromechanics;

    机译：珠光体钢;纳米晶拉丝;断裂;微力学;

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