An Assessment of Properties of Construction Parts from Small Punch Creep Tests of Surface Specimens

  1. Prof. Dr. P. Neumann2,
  2. Dr. D. Allen3 and
  3. Prof. Dr. E. Teuckhoff4
  1. Ferdinand Dobeš and
  2. Karel Milička

Published Online: 5 JAN 2006

DOI: 10.1002/3527606181.ch67

Steels and Materials for Power Plants, Volume 7

Steels and Materials for Power Plants, Volume 7

How to Cite

Dobeš, F. and Milička, K. (2000) An Assessment of Properties of Construction Parts from Small Punch Creep Tests of Surface Specimens, in Steels and Materials for Power Plants, Volume 7 (eds P. Neumann, D. Allen and E. Teuckhoff), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527606181.ch67

Editor Information

  1. 2

    Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, 40237 Düsseldorf, Germany

  2. 3

    ABB Asltom Power UK Ltd., Cambridge Road, Whetstone, Leicester LE9 GLH, United Kingdom

  3. 4

    Siemens AG, Postfach 3240, 91050 Erlangen, Germany

Author Information

  1. Institute of Physics of Materials, Brno, Czech Republic

Publication History

  1. Published Online: 5 JAN 2006
  2. Published Print: 27 JUN 2000

Book Series:

  1. EUROMAT 99

ISBN Information

Print ISBN: 9783527301959

Online ISBN: 9783527606184

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Keywords:

  • steels for power plants;
  • materials for power plant;
  • properties of construction parts;
  • small punch creep tests;
  • surface specimens

Summary

The necessity of evaluation the mechanical properties of real structure parts without service interruption led to the invention of the miniature surface sample removal technique (SSAM) [1]. This technique enables non-destructive inspection and in-service monitoring of properties of high temperature plants parts, e.g., steam pipes in the power generating industry. Two main questions are crucial for its industrial application: (i) how to estimate the mechanical properties of small amounts of material; (ii) do the properties of surface specimens characterize the level of body damage?

The first question can be solved by means of the small punch testing, consisting of an analysis of the deformation of a disc specimen with a penetrator [2]. Tests of this type are used to estimate the ductile-to-brittle transition temperature (fracture appearance transition temperature) [3] or the fracture toughness KIC or JIC [4]. More recently, a small punch geometry has also been applied to high temperature creep [5, 6].

To answer the second question, a series of comparative small punch tests of specimens taken either from the surface or from the body of exposed construction parts has to be done. The purpose of the present contribution is to perform such a study using material from pipe bend which was subjected to long term testing at conditions corresponding to those in power plants.