Carbidausscheidungen in Nickelbasis Modellegierungen und ihr Einfluss auf das Verformungs- und Bruchverhalten bei Raumtemperatur
Carbidausscheidungen in Nickelbasis Modellegierungen und ihr Einfluss auf das Verformungs- und Bruchverhalten bei Raumtemperatur
The influence of carburization with internal carbide formation on the room temperature tensile properties was determined for nickel-base model alloys of different compositions. The relationship between carbide volume fraction and the loss of ductility was systematically investigated. The embrittleme...
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Personal Name(s): | Mohr, K. P. (Corresponding author) |
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Schuster, H. / Nickel, Hubertus | |
Contributing Institute: |
Publikationen vor 2000; PRE-2000; Retrocat |
Imprint: |
Jülich
Kernforschungsanlage Jülich GmbH, Zentralbiliothek, Verlag
1983
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Physical Description: |
98 p. |
Document Type: |
Report Book |
Research Program: |
ohne Topic |
Series Title: |
Berichte der Kernforschungsanlage Jülich
1845 |
Link: |
OpenAccess |
Publikationsportal JuSER |
The influence of carburization with internal carbide formation on the room temperature tensile properties was determined for nickel-base model alloys of different compositions. The relationship between carbide volume fraction and the loss of ductility was systematically investigated. The embrittlement was found to be severe for volume fractions greater than about 0 .03 if the carbides were formed principally on grain and twin boundaries. Cracks were propagated unhindered in the continuous, grain boundary carbide films formed in alloys containing Cr or Mo and caused intergranular fracture with rupture elongations of similar magnitude to that of the carbide phase itself. Grain boundary carbide precipitates which were not continuous led to less severe ductility loss. Intracrystalline carbide precipitates as found in the W or Nb containing alloys reduced the ductility only slightly compared with grain boundary carbidesin alloys of similar carbon content because the linkage of pores was prevented by the presence of ductile matrix between the pores.The fracture of individual intragranular carbides as well as of connected carbide plates was interpreted using the parallel loaded, two phase structure model. The form of the relationship between the 0.2 % proof stress and the carbide volume fraction was qualitatively described using a rule of mixtures. The rule of mixtures could not however satisfactorily describe the tensile strength and the true rupture elongation without consideration of crack growth by linkage of pores between fractured carbide particles. |