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Microanalysis for Design and Development of Improved High-Temperature Alloys

Published online by Cambridge University Press:  02 July 2020

Philip J. Maziasz
Philip J. Maziasz*
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831
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Abstract

Alloy development can range from purely empirical, trial-and-error efforts to very theoretical, based on either fundamental first-principles calculations or computational-modeling using various kinds of data base inputs. However, “real-world” efforts to improve or optimize complex engineering alloys often cannot afford the time or cost of either extreme approach. in the past 10-15 years, an alloy development and processing optimization methodology has been developed that utilizes strategic microanalytical data (both detailed microstucture and microcompositional information) as the critical input that then enables efficient and effective design of various kinds of alloys for improved high-temperature performance [1-6]. in many cases, first time tests produce outstanding high-temperature creep or creep-rupture results, and enable improvements without trading off one property for another. This invited paper will highlight several examples of significantly improved creep resistance obtained using such microstructural design.

This microstructural design methodology for high-temperature creep-resistance was initially developed for and demonstrated in austenitic stainless steels (Fe-14Cr-16Ni) designed for improved creep-strength and rupture resistance at 700°C and above for superheater and boiler tubing in advanced fossil power plants.

Type
Microscopy in the Real World: Alloys and Other Materials
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 544 - 545
Copyright
Copyright © Microscopy Society of America 2001

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References

1.Maziasz, P.J., JOM, 41/7 (1989) 14–20.CrossRefGoogle Scholar
2.Swindeman, R.W. and Maziasz, P.J., in Creep:Characterization, Damage and Life Assessments. ASM-International, Materials Park, OH (1992) 33–42.Google Scholar
3.Swindeman, R.W. and Maziasz, P.J., in Heat-Resistant Materials. ASM-International, Materials Park, OH (1991) 251–259.Google Scholar
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6.Larson, D.J., Maziasz, P.J., Kim, I-S., and Miyahara, K., to be published in Scripta Materialia in 2001.Google Scholar
7. Research sponsored by the U.S. Department of Energy, Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Power Technologies as part of the Microturbines Materials Program, and by the Laboratory Directed Research and Development Program under contract DE-AC05-00OR22725 with UT-Battelle, LLC.Google Scholar