Fatigue behaviour of Polarit 725 stainless steel

Gary Marquis

Research output: Book/ReportReportProfessional

Abstract

Fatigue tests on a stainless steel, Polarit 725, manufactured by Outokumpu Polarit have been performed. These tests are intended to provide some needed constant amplitude fatigue data and give a starting point for ongoing research work using variable amplitude loading. The Polarit 725 (AISI 304) was tested in two conditions. The first was hot rolled and the second was cold rolled to achieve 21.1% cold work. Fatigue tests included strain life, crack growth rate measurement in the Paris regime and crack growth rate measurement in the near threshold regime. Other tests included through the thickness hardness measurements and static tensile tests. High frequency stress controlled endurance limit testing was not possible for this material due to the significant amount of plastic deformation induced heating. The hot rolled material was very resistant to crack initiation during high cycle strain life testing. The material also showed progressive cyclic softening during the first 20% of life followed by a significant amount of hardening. The crack growth rate parameters and crack growth threshold parameters were comparable to more conventional steels. Crack growth rate specimens manufactured from the hot rolled material developed very straight crack fronts during testing while the specimens manufactured from the cold rolled material had very severe crack front angles that did not meet the requirements given in the testing standards. The crack front angle was possibly a result of internal residual stresses but this hypothesis has not been confirmed.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages36
ISBN (Print)951-38-4628-8
Publication statusPublished - 1994
MoE publication typeNot Eligible

Publication series

NameVTT Publications
PublisherVTT
No.190
ISSN (Print)1235-0621
ISSN (Electronic)1455-0849

Fingerprint

Crack propagation
Stainless steel
Fatigue of materials
Testing
Cracks
Residual stresses
Crack initiation
Hardening
Plastic deformation
Durability
Hardness
Heating
Steel

Keywords

  • steels
  • stainless steels
  • fatigue (materials)
  • fatigue tests
  • Polarit 725
  • cracking (fracturing)
  • plastic deformation

Cite this

Marquis, G. (1994). Fatigue behaviour of Polarit 725 stainless steel. Espoo: VTT Technical Research Centre of Finland. VTT Publications, No. 190
Marquis, Gary. / Fatigue behaviour of Polarit 725 stainless steel. Espoo : VTT Technical Research Centre of Finland, 1994. 36 p. (VTT Publications; No. 190).
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Marquis, G 1994, Fatigue behaviour of Polarit 725 stainless steel. VTT Publications, no. 190, VTT Technical Research Centre of Finland, Espoo.

Fatigue behaviour of Polarit 725 stainless steel. / Marquis, Gary.

Espoo : VTT Technical Research Centre of Finland, 1994. 36 p. (VTT Publications; No. 190).

Research output: Book/ReportReportProfessional

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N2 - Fatigue tests on a stainless steel, Polarit 725, manufactured by Outokumpu Polarit have been performed. These tests are intended to provide some needed constant amplitude fatigue data and give a starting point for ongoing research work using variable amplitude loading. The Polarit 725 (AISI 304) was tested in two conditions. The first was hot rolled and the second was cold rolled to achieve 21.1% cold work. Fatigue tests included strain life, crack growth rate measurement in the Paris regime and crack growth rate measurement in the near threshold regime. Other tests included through the thickness hardness measurements and static tensile tests. High frequency stress controlled endurance limit testing was not possible for this material due to the significant amount of plastic deformation induced heating. The hot rolled material was very resistant to crack initiation during high cycle strain life testing. The material also showed progressive cyclic softening during the first 20% of life followed by a significant amount of hardening. The crack growth rate parameters and crack growth threshold parameters were comparable to more conventional steels. Crack growth rate specimens manufactured from the hot rolled material developed very straight crack fronts during testing while the specimens manufactured from the cold rolled material had very severe crack front angles that did not meet the requirements given in the testing standards. The crack front angle was possibly a result of internal residual stresses but this hypothesis has not been confirmed.

AB - Fatigue tests on a stainless steel, Polarit 725, manufactured by Outokumpu Polarit have been performed. These tests are intended to provide some needed constant amplitude fatigue data and give a starting point for ongoing research work using variable amplitude loading. The Polarit 725 (AISI 304) was tested in two conditions. The first was hot rolled and the second was cold rolled to achieve 21.1% cold work. Fatigue tests included strain life, crack growth rate measurement in the Paris regime and crack growth rate measurement in the near threshold regime. Other tests included through the thickness hardness measurements and static tensile tests. High frequency stress controlled endurance limit testing was not possible for this material due to the significant amount of plastic deformation induced heating. The hot rolled material was very resistant to crack initiation during high cycle strain life testing. The material also showed progressive cyclic softening during the first 20% of life followed by a significant amount of hardening. The crack growth rate parameters and crack growth threshold parameters were comparable to more conventional steels. Crack growth rate specimens manufactured from the hot rolled material developed very straight crack fronts during testing while the specimens manufactured from the cold rolled material had very severe crack front angles that did not meet the requirements given in the testing standards. The crack front angle was possibly a result of internal residual stresses but this hypothesis has not been confirmed.

KW - steels

KW - stainless steels

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KW - cracking (fracturing)

KW - plastic deformation

M3 - Report

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Marquis G. Fatigue behaviour of Polarit 725 stainless steel. Espoo: VTT Technical Research Centre of Finland, 1994. 36 p. (VTT Publications; No. 190).