Turbocharger and holding disk therefor

Abstract

The invention describes a holding disk for use in turbochargers, in particular for diesel engines, said holding disk consisting of an iron-based alloy having an austenitic base structure with dendritic carbide precipitations.

1 . A holding disk for use in turbochargers, said holding disk consisting of an iron-based alloy having an austenitic base structure with dendritic carbide precipitations. 
     
     
         2 . The holding disk as claimed in  claim 1 , wherein it contains the following components:
 C: 0.1 to 0.6% by weight, Cr: 22 to 27% by weight, Ni: 6.5 to 15% by weight, Mn: 7.5 to 14.5% by weight, Si: ≦1% by weight, V: 0.75 to 2.5% by weight, N: 0.1 to 0.7% by weight and Fe.   
     
     
         3 . The holding disk as claimed in  claim 1 , wherein it is free from sigma phases. 
     
     
         4 . A diesel engine exhaust gas turbocharger, comprising a holding disk consisting of an austenitic base structure with dendritic carbide precipitations. 
     
     
         5 . The diesel engine exhaust gas turbocharger as claimed in  claim 4 , wherein the holding disk contains the following components:
 C: 0.1 to 0.6% by weight, Cr: 22 to 27% by weight, Ni: 6.5 to 15% by weight, Mn: 7.5 to 14.5% by weight, Si: ≦1% by weight, V: 0.75 to 2.5% by weight, N: 0.1 to 0.7% by weight and Fe.   
     
     
         6 . The diesel engine exhaust gas turbocharger as claimed in  claim 4 , wherein the material of the holding disk is free from sigma phases. 
     
     
         7 . A turbocharger having a variable turbine geometry, the turbocharger having a casing, and including adjusting blades mounted rotatably in a blade bearing ring and moveable by means of an adjusting ring arranged in the turbine casing of the turbocharger, wherein the flow space over the adjusting blades is axially delimited limited on one side by the blade bearing ring and on the other side by a holding disk arranged in the turbine casing, wherein said holding disk consisting of an iron-based alloy having an austenitic base structure with dendritic carbide precipitations.