Controlling phase formation and stability to improve the high temperature creep resistance of austenitic stainless steels
New Fe-14Cr-16Ni-2.5Mo-2Mn steels modified with carefully controlled additions of Ti, Nb, V, C, P and B have been developed which have outstanding creep rupture resistance at 700/degree/C and 170 MPa, much better than comparable commercial steels. The minor alloying element levels and combinations were chosen a priori to produce specific microstructures of fine MC and FeTiP precipitates in the matrix and coarser carbides (M/sub 23/C/sub 6/, M/sub 6/C and MC) along grain boundaries before creep properties were ever measured. The precipitates directly produce the creep resistance observed in the new steels. The ideas that guided these modifications to tailor and control the precipitate microstructure stem from years of studying precipitation in aged and reactor irradiated steels by the use of analytical electron microscopy (AEM). 14 refs., 5 figs., 1 tab.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5002660
- Report Number(s):
- CONF-8804112-5; ON: DE88011401
- Resource Relation:
- Conference: Interfacial structure, properties and designs in solids, Reno, NV, USA, 5 Apr 1988
- Country of Publication:
- United States
- Language:
- English
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CARBON ADDITIONS
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
FABRICATION
FOSSIL-FUEL POWER PLANTS
HIGH TEMPERATURE
MATERIALS TESTING
NIOBIUM ADDITIONS
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BORON ALLOYS
CRYSTAL STRUCTURE
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MECHANICAL PROPERTIES
MICROSCOPY
NIOBIUM ALLOYS
NUMERICAL DATA
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STEELS
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360102* - Metals & Alloys- Structure & Phase Studies
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200104 - Fossil-Fueled Power Plants- Components