Oxy-fuel combustion is burning a fuel in oxygen rather than air for ease of capture of CO 2 from for reuse or sequestration. Corrosion issues associated with the environment change (replacement of much of the N 2 with CO 2 and higher sulfur levels) from air- to oxy-firing were examined. Alloys studied included model Fe–Cr alloys and commercial ferritic steels, austenitic steels, and nickel base superalloys. The corrosion behavior is described in terms of corrosion rates, scale morphologies, and scale/ash interactions for the different environmental conditions. Evidence was found for a hreshold for severe attack between 10 -4 and 10 -3 atm of SO 3 at 700ºC.

01 COAL, LIGNITE, AND PEAT↗

DOE OSTI2012

9 Cr-- 1 Mo steel material for high temperature application

One or more embodiments relates to a high-temperature, titanium alloyed, 9 Cr-1 Mo steel exhibiting improved creep strength and oxidation resistance at service temperatures up to 650.degree. C. The 9 Cr-1 Mo steel has a tempered martensite microstructure and is comprised of both large (0.5-3 .mu.m) primary titanium carbides and small (5-50 nm) secondary titanium carbides in a ratio of. from about 1:1.5 to about 1.5:1. The 9 Cr-1 Mo steel may be fabricated using exemplary austenizing, rapid cooling, and tempering steps without subsequent hot working requirements. The 9 Cr-1 Mo steel exhibits improvements in total mass gain, yield strength, and time-to-rupture over ASTM P91 and ASTM P92 at the temperature and time conditions examined.

36 MATERIALS SCIENCE↗

DOE OSTI2012

Heat treated 9 Cr-1 Mo steel material for high temperature application

The invention relates to a composition and heat treatment for a high-temperature, titanium alloyed, 9 Cr-1 Mo steel exhibiting improved creep strength and oxidation resistance at service temperatures up to 650.degree. C. The novel combination of composition and heat treatment produces a heat treated material containing both large primary titanium carbides and small secondary titanium carbides. The primary titanium carbides contribute to creep strength while the secondary titanium carbides act to maintain a higher level of chromium in the finished steel for increased oxidation resistance, and strengthen the steel by impeding the movement of dislocations through the crystal structure. The heat treated material provides improved performance at comparable cost to commonly used high-temperature steels such as ASTM P91 and ASTM P92, and requires heat treatment consisting solely of austenization, rapid cooling, tempering, and final cooling, avoiding the need for any hot-working in the austenite temperature range.

36 MATERIALS SCIENCE↗

DOE OSTI2012

In Situ Electrochemical Corrosion Measurements of Carbon Steel in Supercritical CO2 Using a Membrane-Coated Electrochemical Probe

ECS Meeting Abstracts, MA2012-01(15), 657-657.

Beck, Justin↗

DOE OSTI2011

Fireside Corrosion

Oxy-fuel fireside research goals are: (1) determine the effect of oxyfuel combustion on fireside corrosion - flue gas recycle choice, staged combustion ramifications; and (2) develop methods to use chromia solubility in ash as an ash corrosivity measurement - synthetic ashes at first, then boiler and burner rig ashes.

36 MATERIALS SCIENCE↗

DOE OSTI2011

Corrosion of Carbon Steel in CO2 Saturated with Water and in Water Saturated with CO2

ECS Meeting Abstracts, 1101(15), 1067-1067.

Lvov, Serguei N.↗