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| Hauptseite > Publikationsdatenbank > Tailoring the Hardening Behavior of 18CrNiMo7-6 via Cu Alloying |
| Hauptseite > Publikationsdatenbank > Tailoring the Hardening Behavior of 18CrNiMo7-6 via Cu Alloying |
| Journal Article | FZJ-2016-06964 |
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2016
Wiley-VCH73294
Weinheim
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Please use a persistent id in citations: doi:10.1002/srin.201500129
Abstract: In order to improve the rolling contact fatigue (RCF) behavior of gear steels, a concept to increase their damage tolerance is developed alternatively to the conventional approach of improving the degree of steel cleanliness. For that purpose, Cu is used as a main alloying element in order to trigger the precipitation of nano-sized Cu precipitates which shall improve the strain-hardening rate of the martensitic matrix of Cu-alloyed 18CrNiMo7-6 steel surrounding a non-metallic inclusion during plastic deformation. In this way, early component failure may be avoided and the maintenance costs of, e.g., wind energy converters may be kept low. The experimental analysis shows that nano-sized Cu precipitates influence the material's strength, ductility, and strain-hardening behavior under tension, depending on their coherence. Among others, the latter is related to strain-induced martensitic transformation of coherent Cu. The structure of the Cu precipitates is studied by TEM and SANS analysis. The Cu-alloyed steel also shows an increased hardening-exponentCHT studied by cyclic hardness test (CHT) PHYBALCHT. Fatigue tests of specimens with coherent precipitates show cyclic hardening until a critical stress amplitude. Above that, stress amplitude cyclic softening is detected. An increased damage tolerance could be obtained for a 1 mass-% Cu-alloyed 18CrNiMo7-6 steel.
Keyword(s): Engineering, Industrial Materials and Processing (1st) ; Materials Science (2nd)
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