- Additional Authors
- Description
- iii, 104 p. : ill.; 29 cm.
- Summary
- The microstructure, phase compositions, and phase fractions were studied in conventionally cast B-1900 Hf and both conventionally cast and directionally solidified MAR-M247 as a function of tantalum concentration. The hot tensile and creep rupture properties of the solutionized and aged MAR-M247-type alloys were also determined as a function of tantalum level. The effects of tantalum on the microstructure and phase compositions of B-1900 Hf and MAR-M247 (conventionally cast and directionally solidified) were found to be very similar. The addition of tantalum to the as cast and heat treated alloys was shown to cause the partial replacement of the Hf in the MC carbides by Ta, although the degree of replacement was decreased by the solutionizing and aging heat treatment. The gamma prime and minor phase fractions (primarily MC type carbides) both increased approximately linearly with tantalum concentration. The gamma prime phase compositions were relatively insensitive to tantalum variations with the exception of the tantalum and/or hafnium levels. Bulk tantalum additions increased the tantalum, chromium, and cobalt levels of the gamma phase in both alloy series. The increase in the concentrations of the latter two elements in the gamma phase was a result of the decrease in the gamma phase fraction with increasing bulk tantalum concentration and constant gamma/gamma prime partitioning ratio. Tantalum additions increased the yield stress and ultimate tensile strength of the directionally solidified MAR-M247 type alloys and had no significant effect on ductility.
- Series Statement
- NASA contractor report ; 174847
- Uniform Title
- NASA contractor report ; NASA CR-174847.
- Subject
- Note
- Bibliography (note)
- Includes bibliographical references (p. 100-104).
- Reproduction (note)
- Funding (note)
- Call Number
- GPO Microfiche NAS 1.26:174847
- OCLC
- marcive291102569
- Author
Janowski, Gregg M.
- Title
The effect of tantalum on the structure/properties of two polycrystalline nickel-base superalloys B-1900 + Hf and MAR-M247 [microform] : [final report] / by Gregg M. Janowski, prepared for National Aeronautics and Space Administration, Lewis Research Center under grant NAG 3-216.
- Imprint
Houghton, MI : Michigan Technological University, [1985]
- Series
NASA contractor report ; 174847
NASA contractor report ; NASA CR-174847.
- Bibliography
Includes bibliographical references (p. 100-104).
- Reproduction
Microfiche. [Washington, D.C. : National Aeronautics and Space Administration], 1985. 2 microfiches : negative.
- Funding
NASA grant NAG 3-216
- Added Author
Michigan Technological University.
Lewis Research Center.
- Gpo Item No.
0830-H-14 (MF)
- Sudoc No.
NAS 1.26:174847