Surface-alloyed cylindrical, partially cylindrical or hollow cylindrical component
AssigneeVAW Aluminium AG
InventorsJosef Franz Feikus, Alexander Fischer
Life of this patent
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Abstract
Surface-alloyed cylindrical, partly cylindrical or hollow cylindrical structural member, consisting of an aluminium matrix casting alloy and a precipitation zone extending as far as the upper surface of the structural member, comprising an aluminium based alloy with precipitated hard phases, where between the matrix and the precipitation zone there is a eutectic zone supersaturated by primary hard phases (hereinafter called the transition zone) and the increase in hardness from the matrix to the surface of the structural member takes place stepwise.
Claims6
Surface-alloyed cylindrical, partly cylindrical or hollow cylindrical structural member, consisting of an aluminium matrix casting alloy and a precipitation zone extending as far as the upper surface of the structural member, comprising an aluminium based alloy with precipitated hard phases,
- characterised in that,
- between the matrix and the precipitation zone there is a eutectic zone supersaturated by primary hard phases (hereinafter called the transition zone) and the increase in hardness from the matrix to the surface of the structural member takes place stepwise.
Structural member according to one of the preceding claims,
- characterised in that,
- the layer thickness ratio measured from the surface of the structural member in the direction of the aluminium matrix between the precipitation zone and the transition zone is greater than 2:1.
Structural member according to one of the preceding claims,
- characterised in that,
- the increase in hardness between the matrix and the surface of the structural member takes place stepwise, where the increase in hardness in the matrix, in the transition zone and in the precipitation zone is in the ratio 1:1.5:2 to 1:2:3 and the final hardness at the surface of the structural member lies above 200 HV.
Dependencies are inferred from the claim text.