How inadequate heat treatment or complete lack thereof can cause component failures
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A. Neidel
Apprenticeship as a materials testing technician at the welding institute SLV Berlin-Brandenburg. After that, she studied materials science at the Berlin Institute of Technology. She graduated with a masters degree in materials science in 2012. Since November 2012 employment as engineer at the Metallography Laboratory of the Siemens Gas Turbine Works in Berlin. She has been appointed laboratory manager within the Berlin Testing Center of the Large Gas Turbine Engineering Group in 2014. Her main fields of expertise comprise failure analysis and microstructural investigations using the field emission scanning electron microscope.
joined the Gas Turbine Plant of Siemens’ Energy Sector in 1984 and first underwent vocational training there. As a materials testing technician, one of the first fields of her professional endevours was steam turbine service, namely remaining lifetime assessment by means of the replica technique. She is a metallographer and one of the principal failure analysts in the materials testing laboratory. Her main fields of expertise comprise microstructural analyses of steel and iron castings.
Abstract
This paper is a compilation of failure analysis case studies exploring the subject of inadequate heat treatment. As with other papers in this series, the presented failure cases are rather simple and may appear trivial to the experienced failure analyst. The authors can guarantee however, that minor heat treatment errors are committed easily and have a considerable damage potential which may entail heavy financial losses. Therefore, cases of inadequate heat treatment or a complete lack of necessary heat treatment belong by all means in the column Failure Analysis. The metallurgical subject of these failure cases are low-alloy hardenable steels without exception. Common heat treatment processes such as induction hardening, case hardening, nitriding as well as through-hardening and tempering will be touched upon.
Kurzfassung
Inhalt dieses Beitrags ist eine Zusammenstellung schadensanalytischer Fallstudien, die Wärmebehandlungsfehler zum Inhalt haben. Wie bereits in anderen Beiträgen dieser Reihe, sind auch die hier gezeigten Fälle recht einfach und mögen dem erfahrenen Schadenskundler trivial erscheinen. Die Autoren können aber versichern, dass das Schadenspotential der gezeigten einfachen Wärmebehandlungsfehler erheblich sein und große wirtschaftliche Schäden verursachen kann. Wärmebehandlungsfehler oder auch das Weglassen einer eigentlich erforderlichen Wärmebehandlung gehören deshalb unbedingt in diese Rubrik Failure Analysis. Werkstofftechnischer Gegenstand der Fallbeispiele sind ausnahmslos niedriglegierte Vergütungsstähle (low-alloy hardenable steels). Von den gängigen Wärmebehandlungsverfahren werden Induktionshärten, Einsatzhärten, Nitrieren und Durchvergüten angesprochen.
About the authors
Apprenticeship as a materials testing technician at the welding institute SLV Berlin-Brandenburg. After that, she studied materials science at the Berlin Institute of Technology. She graduated with a masters degree in materials science in 2012. Since November 2012 employment as engineer at the Metallography Laboratory of the Siemens Gas Turbine Works in Berlin. She has been appointed laboratory manager within the Berlin Testing Center of the Large Gas Turbine Engineering Group in 2014. Her main fields of expertise comprise failure analysis and microstructural investigations using the field emission scanning electron microscope.
joined the Gas Turbine Plant of Siemens’ Energy Sector in 1984 and first underwent vocational training there. As a materials testing technician, one of the first fields of her professional endevours was steam turbine service, namely remaining lifetime assessment by means of the replica technique. She is a metallographer and one of the principal failure analysts in the materials testing laboratory. Her main fields of expertise comprise microstructural analyses of steel and iron castings.
References / Literatur
[1] Neidel, A.; Giller, M.; Riesenbeck, S.: Interner Bericht LGT QM QL/2014/0192r. Berlin, 10.04.2014.Search in Google Scholar
[2] Cagliyan, E.; Fischer, B.: Metallurgical Failure Investigation of a Surface Hardened Drive Shaft Made of Tempered Low-Alloy Steel 25CrMo4 (1.7218). Pract. Metallogr. 53 (2016) 9, S. 592–597. https://doi.org/10.3139/147.11039510.3139/147.110395Search in Google Scholar
[3] Neidel, A.; Giller, M.: Erweiterte Wareneingangsprüfung an drei Kleinzahnrädern. Interner Bericht BLN MT/2016/0105. Berlin, 27.02.2016.Search in Google Scholar
[4] Neidel, A.; Riesenbeck, S.; Cagliyan, E.; Weinbrenner, T.: Internal Report BLN MT/2019/0014, Berlin, January 22, 2019.Search in Google Scholar
[5] Neidel, A.; Riesenbeck, S.; Cagliyan, E.: Failure of a Turning Gear Pinion Shaft. Pract. Metallogr. (to be published).Search in Google Scholar
[6] Internal Product Change Management Report PCM 3-18-018394.Search in Google Scholar
[7] Internal Specification SLV 3630008.Search in Google Scholar
[8] Neidel, A.; Kramm, C.: Fischer, B.: Werkstofftechnische Untersuchung einer verbogenen Transportkrone für Radscheiben. Interner Bericht BLN MT/2020/0897. Berlin, 15.12.2020.Search in Google Scholar
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Articles in the same Issue
- Contents
- Editorial
- Editorial
- Structural analysis of Cu-based FeCr reinforced composites prepared by mechanical alloying
- Scale-bridging contrasting and characterization of multi-wire submerged arc welds and electron beam welds in steels
- Evaluation of nickel shot peening process on strength of friction stir welded AA2014-T6 aluminum alloy joints
- Failure Analysis
- How inadequate heat treatment or complete lack thereof can cause component failures
- Picture of the Month
- Picture of the Month
- News
- News
- Meeting Dairy
- Meeting Diary
