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Title: Creep resistant high temperature martensitic steel

Abstract

The disclosure provides a creep resistant alloy having an overall composition comprised of iron, chromium, molybdenum, carbon, manganese, silicon, nickel, vanadium, niobium, nitrogen, tungsten, cobalt, tantalum, boron, and potentially additional elements. In an embodiment, the creep resistant alloy has a molybdenum equivalent Mo(eq) from 1.475 to 1.700 wt. % and a quantity (C+N) from 0.145 to 0.205. The overall composition ameliorates sources of microstructural instability such as coarsening of M.sub.23C.sub.6 carbides and MX precipitates, and mitigates or eliminates Laves and Z-phase formation. A creep resistant martensitic steel may be fabricated by preparing a melt comprised of the overall composition followed by at least austenizing and tempering. The creep resistant alloy exhibits improved high-temperature creep strength in the temperature environment of around 650.degree. C.

Inventors:
; ;
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1225785
Patent Number(s):
9,181,597
Application Number:
13/868,139
Assignee:
U.S. Department of Energy NETL
Resource Type:
Patent
Resource Relation:
Patent File Date: 2013 Apr 23
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Hawk, Jeffrey A., Jablonski, Paul D., and Cowen, Christopher J. Creep resistant high temperature martensitic steel. United States: N. p., 2015. Web.
Hawk, Jeffrey A., Jablonski, Paul D., & Cowen, Christopher J. Creep resistant high temperature martensitic steel. United States.
Hawk, Jeffrey A., Jablonski, Paul D., and Cowen, Christopher J. Fri . "Creep resistant high temperature martensitic steel". United States. https://www.osti.gov/servlets/purl/1225785.
@article{osti_1225785,
title = {Creep resistant high temperature martensitic steel},
author = {Hawk, Jeffrey A. and Jablonski, Paul D. and Cowen, Christopher J.},
abstractNote = {The disclosure provides a creep resistant alloy having an overall composition comprised of iron, chromium, molybdenum, carbon, manganese, silicon, nickel, vanadium, niobium, nitrogen, tungsten, cobalt, tantalum, boron, and potentially additional elements. In an embodiment, the creep resistant alloy has a molybdenum equivalent Mo(eq) from 1.475 to 1.700 wt. % and a quantity (C+N) from 0.145 to 0.205. The overall composition ameliorates sources of microstructural instability such as coarsening of M.sub.23C.sub.6 carbides and MX precipitates, and mitigates or eliminates Laves and Z-phase formation. A creep resistant martensitic steel may be fabricated by preparing a melt comprised of the overall composition followed by at least austenizing and tempering. The creep resistant alloy exhibits improved high-temperature creep strength in the temperature environment of around 650.degree. C.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Nov 13 00:00:00 EST 2015},
month = {Fri Nov 13 00:00:00 EST 2015}
}

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