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Effects of sintering process and the coating of the reinforcement on the microstructure and performance of co-based superalloy composites.

机译：烧结工艺和增强涂层对钴基高温合金复合材料组织和性能的影响。

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摘要

Stellite 712 is an important alloy that has been widely used for high-temperature wear/corrosion resistance. In order to further enhance its wear resistance, Stellite 712 composites were developed with the reinforcement of TiC using powder metallurgy (PM) techniques in this research. Sintering with hot isostatic pressing (HIP) process and HIP'ing powder consolidation process were employed respectively. The reinforcement used was bare TiC or Ni-coated TiC. The emphases of this research were on the effects of the sintering process and the Ni coating for TiC on the microstructure and performance of the developed composites. Calorimetric effects of pure Stellite 712 and mixed composite powders were investigated using the differential scanning calorimetry (DSC) technique, which provided the theoretical basis for designing the sintering and HIP'ing cycles. The microstructures of the specimens were examined using scanning electron microscope (SEM) with energy dispersive X-ray diffraction (EDX). The wear resistance of the materials was evaluated using a pin-on-disc tribometer. It was found that the two PM processes produced identical microstructures but the specimens exhibited different wear resistance. The Ni coating on the TiC particles has improved the fracture toughness of the composites, but lowered the interfacial bonding strength, leading to a reduction of the wear resistance.
机译：Stellite 712是一种重要的合金，已广泛用于耐高温磨损/腐蚀。为了进一步提高其耐磨性，在本研究中，采用粉末冶金（PM）技术开发了具有TiC增强作用的Stellite 712复合材料。分别采用热等静压（HIP）烧结和HIP'ing粉末固结烧结。所用的增强材料是裸露的TiC或镀镍的TiC。这项研究的重点是烧结工艺和TiC的Ni涂层对开发的复合材料的组织和性能的影响。使用差示扫描量热法（DSC）技术研究了纯Stellite 712和混合复合粉末的量热效应，这为设计烧结和HIP'ing循环提供了理论基础。使用具有能量色散X射线衍射（EDX）的扫描电子显微镜（SEM）检查样品的微观结构。使用销盘式摩擦计评估材料的耐磨性。结果发现，两种粉末冶金工艺产生相同的微观结构，但样品表现出不同的耐磨性。 TiC颗粒上的Ni涂层改善了复合材料的断裂韧性，但降低了界面结合强度，导致耐磨性降低。

著录项

  • 作者

    Ning, Yi.;

  • 作者单位

    Carleton University (Canada).;

  • 授予单位 Carleton University (Canada).;
  • 学科 Engineering Metallurgy.
  • 学位 M.A.Sc.
  • 年度 2004
  • 页码 185 p.
  • 总页数 185
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 冶金工业;
  • 关键词

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