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Ferritic nitrocarburizing process development for minimization of distortion.

机译：开发铁素体氮碳共渗工艺以最大程度地减少变形。

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摘要

Nitrocarburizing is a thermochemical diffusion process that has been proposed as an alternative to carbonitriding to improve the surface characteristics of automotive components without producing unacceptable part distortion. In this study, gas, ion and vacuum ferritic nitrocarburizing using various heat treatment schedules were investigated and compared with a current carbonitriding procedure. Dimensional distortion and residual stresses in Navy C-Rings and torque converter pistons resulting from each treatment process were evaluated. The microstructure and microhardness, as well as the phase composition of the specimens, were also characterized.;The results of this study indicated that the nitrocarburizing process utilizing suitable heat treatment procedures gave rise to smaller size and shape variations in specimens than carbonitriding. However, given the tensile surface residual stresses induced by nitrocarburizing, additional wear testing needs to be carried out to confirm the possibility of replacing the current carbonitriding process with an appropriate ferritic nitrocarburizing procedure.
机译：氮碳共渗是一种热化学扩散工艺，已提出作为碳氮共渗的替代方法，以改善汽车部件的表面特性而不会产生不可接受的零件变形。在这项研究中，对使用各种热处理方案的气体，离子和真空铁素体氮碳共渗进行了研究，并将其与当前的碳氮共渗工艺进行了比较。评估了每个处理过程在海军C型圈和变矩器活塞中产生的尺寸变形和残余应力。还表征了试样的显微组织和显微硬度以及相组成。这项研究的结果表明，采用合适的热处理程序进行的氮碳共渗过程比碳氮共渗法产生的试样尺寸和形状变化更小。然而，考虑到氮碳共渗引起的拉伸表面残余应力，需要进行额外的磨损测试，以确认用合适的铁素体氮碳共渗程序代替当前碳氮共渗工艺的可能性。

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  • 作者

    Nan, Chunyan.;

  • 作者单位

    University of Windsor (Canada).;

  • 授予单位 University of Windsor (Canada).;
  • 学科 Engineering Materials Science.
  • 学位 M.A.Sc.
  • 年度 2009
  • 页码 164 p.
  • 总页数 164
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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