Research Papers: Materials and Fabrication

High-Temperature Creep Property of High-Cr Ferritic Heat-Resisting Steel Identified by Indentation Test

[+] Author and Article Information
Masayuki Arai

Department of Mechanical Engineering,
Tokyo University of Science,
6-3-1, Niijyuku,
Katsushika 162-0825, Tokyo, Japan
e-mail: marai@rs.tus.ac.jp

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received March 23, 2016; final manuscript received June 2, 2016; published online September 27, 2016. Assoc. Editor: Haofeng Chen.

J. Pressure Vessel Technol 139(2), 021403 (Sep 27, 2016) (7 pages) Paper No: PVT-16-1055; doi: 10.1115/1.4033943 History: Received March 23, 2016; Revised June 02, 2016

In this paper, the procedure which can estimate creep exponent and coefficient in Norton's law of the miniature sample from the impression size rather than the penetration depth is discussed based upon a high-temperature creep indentation test. First, an analytical solution related to the change in the impression size with dwelling time at an indentation load is solved by using a well-known problem of infinite creeping media embedding spherical cavity subjected to an inner pressure which characterizes an indentation load. The applicability of the formula to elastic–plastic-creeping model resembling an actual response is checked by conducting a nonlinear finite-element analysis combined with contact option. Finally, creep indentation tests are conducted for a high-Cr ferritic heat-resisting steel, grade 122. It is shown that the creep parameters at a lower stress level can be estimated at temperature 873 K.

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Fig. 1

Cavity model of a creeping media indented by a ball: (a) semi-infinite creeping media and (b) cavity model subjected to inner pressure p

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Fig. 2

Schematic illustration to explain about procedure to estimate creep exponent and coefficient

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Fig. 3

Finite-element model analyzing indentation test with a ball indenter: (a) finite-element model and (b) boundary condition

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Fig. 4

Relationship between impression radius and dwelling time (n = 4.8328 and k = 3.67 × 10−17

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Fig. 5

Creep exponent estimated from FEM

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Fig. 6

Correction factor identified from FEM results

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Fig. 7

Schematic illustration of creep indentation test

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Fig. 8

Typical impression picture after creep indentation test

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Fig. 9

Microstructure of grade 122 utilized in this study

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Fig. 10

Relationship between minimum creep rate and stress at 873 K which was obtained by uniaxial creep tests [21]

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Fig. 11

Relationship between dwelling time and equivalent stress beneath the contact area

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Fig. 13

Creep parameters estimated from the creep indentation test: (a) creep exponent and (b) creep coefficient

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Fig. 12

Variation of impression radius with dwelling time obtained by creep indentation test




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