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The effect of heat treatment on the adiabatic shear bands in AISI 4340 steel at high strain rate.

机译：在高应变速率下，热处理对AISI 4340钢的绝热剪切带的影响。

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摘要

The presence of adiabatic shear bands (ASBs) in a material is detrimental to their structural integrity and may lead to unexpected failure in service. Most of the previous research work has been devoted to initiation and propagation of adiabatic shear bands. This research is focused on process reversal of adiabatic shearing with the ultimate intent of eliminating the deleterious effect of adiabatic shear bands in structural parts which has been subjected to high strain rates during forming or in service. The effect of heat treatment on structure and mechanical properties of (ASBs) is investigated in this study.; Two groups of AISI 4340 steel cylindrical samples were austenized, oil quenched and tempered at 315°C for 1 hr or 425°C for 1 hr respectively, followed by air cooling. The two groups were impacted at high strain rates using the modified Split Hopkinson Pressure Bar (SHPB) to produce adiabatic shear bands in the steel samples. Microstructural evaluation and hardness tests were conducted on the specimens after the impact test. White etching ASBs were mostly observed in the impacted steel samples under the optical microscope. The hardness in the shear band region is much higher than in the rest of material. Since the objective of this research is to eliminate the effect of these bands, selected samples were heat treated at 315, 400, 500, 600 and 650°C. The heat treatment time varied between 20 min and 2 hrs. (Abstract shortened by UMI.)
机译：材料中绝热剪切带（ASB）的存在不利于其结构完整性，并可能导致使用中的意外故障。先前的大多数研究工作都致力于绝热剪切带的产生和传播。这项研究的重点是绝热剪切的过程逆转，其最终目的是消除绝热剪切带在结构零件中的有害作用，该结构零件在成型或使用过程中承受高应变率。在这项研究中研究了热处理对（ASBs）结构和机械性能的影响。对两组AISI 4340钢制圆柱样品进行奥氏体化，油淬和分别在315°C淬火1小时或425°C回火1小时，然后进行空气冷却。使用改良的斯普利特霍普金森压杆（SHPB）以高应变速率冲击两组，以在钢样品中产生绝热剪切带。冲击试验后，对试样进行显微组织评估和硬度试验。在光学显微镜下，在受影响的钢样品中通常观察到白色蚀刻ASB。剪切带区域的硬度远高于其余材料。由于本研究的目的是消除这些谱带的影响，因此将选定的样品在315、400、500、600和650°C的温度下进行了热处理。热处理时间在20分钟至2小时之间变化。 （摘要由UMI缩短。）

著录项

  • 作者

    Al-ameeri, Sahar.;

  • 作者单位

    University of Manitoba (Canada).;

  • 授予单位 University of Manitoba (Canada).;
  • 学科 Engineering Mechanical.
  • 学位 M.Sc.
  • 年度 2005
  • 页码 116 p.
  • 总页数 116
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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