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Journal of Materials Science

, Volume 29, Issue 15, pp 4093–4098 | Cite as

Grain refinement by utilizing grain-boundary reaction in heat-resistant alloys

  • M. Tanaka
Papers

Abstract

The possibility of grain refinement by thermal cycling is examined on commercial heatresistant alloys, namely, an austenitic 21Cr-4Ni-9Mn steel and a cobalt-base HS-21 alloy, in which the grain-boundary reaction occurs. A thermal cycle is composed of a high-temperature ageing which causes the grain-boundary reaction, and a subsequent short-term heating at the resolution temperature, which ensures complete dissolution of the grain-boundary reaction precipitates into the matrix. The grain diameter is finally reduced to about one-half or one-third of the original grain size after four thermal cycles, while a larger grain-size reduction is observed in the specimens with initially larger grain size. The effects of the amount of the grain-boundary reaction and the heat-treatment conditions on grain refinement are also experimentally discussed.

Keywords

Polymer Grain Size Thermal Cycling Material Processing Thermal Cycle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • M. Tanaka
    • 1
  1. 1.Department of Mechanical Engineering, Mining CollegeAkita UniversityAkitaJapan

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