Electron microscopy analysis of structural changes within white etching areas

Annika Martina Diederichs, A. Schwedt, J. Mayer, T. Dreifert

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

In the present work, crack networks with white etching areas (WEAs) in cross-sections of bearings were investigated by a complementary use of SEM and TEM with the focus on the use of orientation contrast imaging and electron backscatter diffraction (EBSD). Orientation contrast imaging was used for the first time to give detailed insight into the microstructure of WEA. A significant difference between Nital-etched and polished WEA samples was observed. It was revealed that WEAs are composed of different areas with varying grain sizes. As a result of secondary transformation, needle-shaped grains were observed within WEAs. Using EBSD analysis, evidence was obtained that WEA formation and accompanying crack growth are without relation microstructural features. In addition, an inhomogeneous chemical structure of WEA as a result of carbide dissolution is revealed by analytical investigations.
Original languageEnglish
JournalMaterials Science and Technology
Volume32
Issue number16
Pages (from-to)1683-1693
ISSN0267-0836
DOIs
Publication statusPublished - 2016

Keywords

  • White etching area (WEA)
  • White etching cracks (WECs)
  • Steel
  • Electron microscopy
  • Rolling contact fatigue

Cite this

Diederichs, Annika Martina ; Schwedt, A. ; Mayer, J. ; Dreifert, T. / Electron microscopy analysis of structural changes within white etching areas. In: Materials Science and Technology. 2016 ; Vol. 32, No. 16. pp. 1683-1693.
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abstract = "In the present work, crack networks with white etching areas (WEAs) in cross-sections of bearings were investigated by a complementary use of SEM and TEM with the focus on the use of orientation contrast imaging and electron backscatter diffraction (EBSD). Orientation contrast imaging was used for the first time to give detailed insight into the microstructure of WEA. A significant difference between Nital-etched and polished WEA samples was observed. It was revealed that WEAs are composed of different areas with varying grain sizes. As a result of secondary transformation, needle-shaped grains were observed within WEAs. Using EBSD analysis, evidence was obtained that WEA formation and accompanying crack growth are without relation microstructural features. In addition, an inhomogeneous chemical structure of WEA as a result of carbide dissolution is revealed by analytical investigations.",
keywords = "White etching area (WEA), White etching cracks (WECs), Steel, Electron microscopy, Rolling contact fatigue",
author = "Diederichs, {Annika Martina} and A. Schwedt and J. Mayer and T. Dreifert",
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Electron microscopy analysis of structural changes within white etching areas. / Diederichs, Annika Martina; Schwedt, A.; Mayer, J.; Dreifert, T.

In: Materials Science and Technology, Vol. 32, No. 16, 2016, p. 1683-1693.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Electron microscopy analysis of structural changes within white etching areas

AU - Diederichs, Annika Martina

AU - Schwedt, A.

AU - Mayer, J.

AU - Dreifert, T.

PY - 2016

Y1 - 2016

N2 - In the present work, crack networks with white etching areas (WEAs) in cross-sections of bearings were investigated by a complementary use of SEM and TEM with the focus on the use of orientation contrast imaging and electron backscatter diffraction (EBSD). Orientation contrast imaging was used for the first time to give detailed insight into the microstructure of WEA. A significant difference between Nital-etched and polished WEA samples was observed. It was revealed that WEAs are composed of different areas with varying grain sizes. As a result of secondary transformation, needle-shaped grains were observed within WEAs. Using EBSD analysis, evidence was obtained that WEA formation and accompanying crack growth are without relation microstructural features. In addition, an inhomogeneous chemical structure of WEA as a result of carbide dissolution is revealed by analytical investigations.

AB - In the present work, crack networks with white etching areas (WEAs) in cross-sections of bearings were investigated by a complementary use of SEM and TEM with the focus on the use of orientation contrast imaging and electron backscatter diffraction (EBSD). Orientation contrast imaging was used for the first time to give detailed insight into the microstructure of WEA. A significant difference between Nital-etched and polished WEA samples was observed. It was revealed that WEAs are composed of different areas with varying grain sizes. As a result of secondary transformation, needle-shaped grains were observed within WEAs. Using EBSD analysis, evidence was obtained that WEA formation and accompanying crack growth are without relation microstructural features. In addition, an inhomogeneous chemical structure of WEA as a result of carbide dissolution is revealed by analytical investigations.

KW - White etching area (WEA)

KW - White etching cracks (WECs)

KW - Steel

KW - Electron microscopy

KW - Rolling contact fatigue

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DO - 10.1080/02670836.2016.1139030

M3 - Journal article

VL - 32

SP - 1683

EP - 1693

JO - Materials Science and Technology

JF - Materials Science and Technology

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