- Path:
-
Erster Teil Siebentes Kapitel
Periodical
- Title:
- Practical metallography
- Parallelsachtitel:
- Praktische Metallographie
- Publication:
-
Berlin: de Gruyter
- Note:
- Erscheint zwölfmal jährlich
- Reihenfolge zwischen Haupttitel und Paralleltitel wechselt
- Gesehen am 18.08.2021
- Text dt. und engl.
- Scope:
- Online-Ressource
- ISSN:
- 2195-8599
- ZDB-ID:
-
2473408-1
- VÖBB-Katalog:
- 35290016
- Keywords:
- Metallographie ; Zeitschrift ; Zeitschrift
- Classification:
- Technik
- DDC Group:
- 600 Technik
- Collection:
- Technik
- Copyright:
- Rights reserved
- Accessibility:
- Eingeschränkter Zugang mit Nutzungsbeschränkungen
Article
- Title:
- Metallographic characterization of axial shims surface damaged upon assembly
- Publication:
-
Berlin: de Gruyter, 2025
- Language:
- English
- Information:
- Abstract: Surface damage to axial shims was reported from the final assembly department of an original equipment manufacturer (OEM) of large gas turbine engines. The damage reportedly occurred upon casing assembly, namely during the “wedding” of the compressor exhaust diffuser with the outer casing. The subject parts were new and never saw any engine service. The subject shims were made of a low-alloy quenched and tempered steel. Their surface hardness was considered too low for this particular application. To rectify the problem, the shims received a physical vapor deposition (PVD) coating using CrN. It was determined that the metallurgical root cause of the surface damage was what is called the eggshell effect. The very hard PVD coating could not be supported by the relatively soft core of the low-alloy steel, causing cracking of the coating and subsequent galling of the substrate when the two heavy casings to be mated in final assembly touched each other hard.
- Scope:
- Online-Ressource
- Note:
- Kein Open Access
- Archivierung/Langzeitarchivierung gewährleistet
- Keywords:
- Shim ; PVD coating ; chromium nitride ; CrN ; 21CrMoV5-7 ; 1 ; 7709 ; DIN EN 10269 ; DIN 17240 ; AD 2000 W7 ; Beilage ; PVD-Beschichtung ; Chromnitrid ; CrN ; 21CrMoV5-7 ; 1 ; 7709 ; DIN EN 10269 ; DIN 17240 ; AD 2000 W7
- Copyright:
- Rights reserved
- Accessibility:
- Eingeschränkter Zugang mit Nutzungsbeschränkungen
