High-Temperature Creep and Oxidation Behavior of Mo-Si-B Alloys with High Ti Contents
- PDF / 925,196 Bytes
- 10 Pages / 593.972 x 792 pts Page_size
- 73 Downloads / 253 Views
CTION
INCREASING the efficiency of turbines for aerospace and power generation applications by operating them at higher temperatures has been of interest in both academia and industry over the past several decades. Currently used Ni-base superalloys are capable of functioning at temperatures approaching 1423 K (1150 C). As this temperature is close to their melting point, it limits their further development.[1] At present, several other metallic systems (e.g., c¢-strengthened Co-based superalloys,[2] multiphase NbSi alloys[3,4]) have the potential of operating at temperatures higher than Ni-base superalloys. Three-phase MoSi-B alloys, consisting of Mo solid solution (bcc) and the intermetallic phases Mo3Si (A15) and Mo5SiB2 (T2), are also of interest as new high-temperature structural DANIEL SCHLIEPHAKE and KATHARINA VON KLINSKI-WETZEL, Scientists, and MARTIN HEILMAIER, Professor, are with the Institute for Applied Materials, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany. Contact email: [email protected] MARIA AZIM, Scientist, BRONISLAVA GORR, Research Staff Member, and HANS-JU¨RGEN CHRIST, Professor, are with the Institute for Materials Engineering, University of Siegen, 57068 Siegen, Germany. HONGBIN BEI, Research Staff Member, is with the Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831. EASO P. GEORGE, Distinguished Research Staff Member, is with the Materials Science and Technology Division, Oak Ridge National Laboratory, and also Professor with the Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996. Manuscript submitted January 18, 2013. Article published online August 23, 2013 1102—VOLUME 45A, MARCH 2014
materials because of their favorable combination of properties such as good oxidation resistance, excellent creep resistance, and strength at ultrahigh temperatures.[1,5–8] However, for application in aero-engines, current Mo-Si-B alloys suffer from one major problem (besides their low room temperature fracture toughness), namely, a relatively high density of around 9.5 g/cm3[9] compared to Ni-base superalloys which typically have densities
Data Loading...
