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Mechanical Properties of Large Ni-Base Superalloy Forgings at Cryogenic Temperatures

  • O. Matsumoto
  • M. Kohno
  • T. Honjo
  • K. Hirose
  • M. Okamura
  • K. Hattori
  • Y. Tsuda
  • N. Suzuki
Part of the An International Cryogenic Materials Conference Publication book series (ACRE, volume 40)

Abstract

A trial forging for advanced cryogenic machinery, which was made of a modified 706-type Ni-base superalloy with reduced Nb, Ti and other minor elements such as C, Si and B to improve toughness and weldability, was manufactured from a 12-ton electro-slag remelted ingot with an 810 mm diameter. The tensile properties and fracture toughness of this large Ni-base superalloy forging were investigated at 293 K and 4 K. At 4 K, the yield strength and fracture toughness were, 1149 MPa and 293 MPa\(\sqrt {\text{m}} \) , respectively. The results indicated that the balance of toughness and yield strength was excellent. Also, a 40-mm-thick ring with a 600 mm outer diameter cut from the same forging was welded using the TIG welding process, and the properties of the weldment were investigated.

Keywords

Fracture Toughness Weld Metal Lave Phase Maximum Crack Length Cryogenic Fracture Toughness 
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

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • O. Matsumoto
    • 1
  • M. Kohno
    • 1
  • T. Honjo
    • 1
  • K. Hirose
    • 1
  • M. Okamura
    • 1
  • K. Hattori
    • 2
  • Y. Tsuda
    • 2
  • N. Suzuki
    • 2
  1. 1.Steel Casting and Forging PlantKobe Steel Ltd.Arai-Cho, TakasagoJapan
  2. 2.Heavy Apparatus Engineering LaboratoryToshiba CorporationTsurumi-Ku, YokohamaJapan

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