Influence of tempering on contact fatigue
2011 (English)In: International Journal of Microstructure and Materials Properties, ISSN 1741-8410, E-ISSN 1741-8429, Vol. 6, no 6, 465-478 p.Article in journal (Refereed) Published
Most components are tempered after heat treatment operations such as case hardening or induction hardening. The common opinion is that the martensitic structure after heat treatment is too brittle and tempering is necessary to increase toughness.
Tempering is an additional operation which leads to increased costs by energy, handling, and investments. Eliminating tempering from the heat treatment process leads to increased productivity, energy savings, and lowered environmental impact.
Two carburised steels, Ovako 253A (?EN 22NiCrMo12-5F mod. A) and EN 20NiCrMo2 (SAE 8620, SS2506), were tested for contact fatigue resistance in a roller to roller rig. The tested samples were characterised with respect to amount of fatigue damage, residual stress, amount of retained austenite and hardness. The objective was to determine if tempering is always necessary after a heat treatment operation.
The contact fatigue tests show that tempering results in lower contact fatigue resistance. Further, fatigue cracks were found to have initiated in different ways between tempered and untempered steel.
Place, publisher, year, edition, pages
2011. Vol. 6, no 6, 465-478 p.
tempering, carburising, case hardening, rolling contact fatigue, EN 20NiCrMo2, Ovako 253, heat treatment, productivity, energy savings, environmental impact, carburised steels, contact fatigue resistance, retained austenite, hardness
Metallurgy and Metallic Materials Tribology
Research subject SRA - Production
IdentifiersURN: urn:nbn:se:kth:diva-47315DOI: 10.1504/IJMMP.2011.044365ScopusID: 2-s2.0-84857243360OAI: oai:DiVA.org:kth-47315DiVA: diva2:454727
FunderXPRES - Initiative for excellence in production research
QC 201111092011-11-082011-11-082015-06-24Bibliographically approved