Pin-hole and crack formation in a duplex stainless steel downhole tool

G. R. Hitchcock; Wiliam F Deans; David Thompson; Alison Margaret Coats

doi:10.1016/S1350-6307(00)00015-7

Pin-hole and crack formation in a duplex stainless steel downhole tool

G. R. Hitchcock, Wiliam F Deans, David Thompson, Alison Margaret Coats

Engineering

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

During pressure testing of a downhole plugging tool manufactured from a duplex stainless steel forging, a failure occurred that had not been observed in similar development projects. The failure was characterised by surface pinhole formation and cracking associated with a region of high plastic strain. Examination revealed that the defects were associated with areas of sigma -phase at the ferrite/austenite phase boundaries local to the centre of the 250 mm diameter forging. Estimation of the cooling rates of the forging during oil quenching showed that the centre region of the forging would not cool at a rate sufficient to exceed the critical cooling rate for sigma -phase formation. The material was shown to be capable of withstanding greater levels of plastic strain in regions where no sigma -phase existed. (C) 2001 Elsevier Science Ltd. All rights reserved.

Original language	English
Pages (from-to)	213-226
Number of pages	13
Journal	Engineering Failure Analysis
Volume	8
Issue number	3
DOIs	https://doi.org/10.1016/S1350-6307(00)00015-7
Publication status	Published - Jun 2001

Keywords

downhole
super duplex
sigma-phase
SIGMA-PHASE PRECIPITATION
MECHANICAL-PROPERTIES

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10.1016/S1350-6307(00)00015-7

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title = "Pin-hole and crack formation in a duplex stainless steel downhole tool",

abstract = "During pressure testing of a downhole plugging tool manufactured from a duplex stainless steel forging, a failure occurred that had not been observed in similar development projects. The failure was characterised by surface pinhole formation and cracking associated with a region of high plastic strain. Examination revealed that the defects were associated with areas of sigma -phase at the ferrite/austenite phase boundaries local to the centre of the 250 mm diameter forging. Estimation of the cooling rates of the forging during oil quenching showed that the centre region of the forging would not cool at a rate sufficient to exceed the critical cooling rate for sigma -phase formation. The material was shown to be capable of withstanding greater levels of plastic strain in regions where no sigma -phase existed. (C) 2001 Elsevier Science Ltd. All rights reserved.",

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author = "Hitchcock, {G. R.} and Deans, {Wiliam F} and David Thompson and Coats, {Alison Margaret}",

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T1 - Pin-hole and crack formation in a duplex stainless steel downhole tool

AU - Hitchcock, G. R.

AU - Deans, Wiliam F

AU - Thompson, David

AU - Coats, Alison Margaret

PY - 2001/6

Y1 - 2001/6

N2 - During pressure testing of a downhole plugging tool manufactured from a duplex stainless steel forging, a failure occurred that had not been observed in similar development projects. The failure was characterised by surface pinhole formation and cracking associated with a region of high plastic strain. Examination revealed that the defects were associated with areas of sigma -phase at the ferrite/austenite phase boundaries local to the centre of the 250 mm diameter forging. Estimation of the cooling rates of the forging during oil quenching showed that the centre region of the forging would not cool at a rate sufficient to exceed the critical cooling rate for sigma -phase formation. The material was shown to be capable of withstanding greater levels of plastic strain in regions where no sigma -phase existed. (C) 2001 Elsevier Science Ltd. All rights reserved.

AB - During pressure testing of a downhole plugging tool manufactured from a duplex stainless steel forging, a failure occurred that had not been observed in similar development projects. The failure was characterised by surface pinhole formation and cracking associated with a region of high plastic strain. Examination revealed that the defects were associated with areas of sigma -phase at the ferrite/austenite phase boundaries local to the centre of the 250 mm diameter forging. Estimation of the cooling rates of the forging during oil quenching showed that the centre region of the forging would not cool at a rate sufficient to exceed the critical cooling rate for sigma -phase formation. The material was shown to be capable of withstanding greater levels of plastic strain in regions where no sigma -phase existed. (C) 2001 Elsevier Science Ltd. All rights reserved.

KW - downhole

KW - super duplex

KW - sigma-phase

KW - SIGMA-PHASE PRECIPITATION

KW - MECHANICAL-PROPERTIES

U2 - 10.1016/S1350-6307(00)00015-7

DO - 10.1016/S1350-6307(00)00015-7

M3 - Article

SN - 1350-6307

VL - 8

SP - 213

EP - 226

JO - Engineering Failure Analysis

JF - Engineering Failure Analysis

IS - 3

ER -

Pin-hole and crack formation in a duplex stainless steel downhole tool

Abstract

Keywords

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