NASA Scientific and Technical Aerospace Reports - The University ...

production as the large military demand for armor plate exceeded the current production capacity at U.S. steel facilities for
quench and tempered high-hard armor (HHA) steel plate. The solution was to expand the availability of HHA steels under the
current HHA military specification (MIL-DTL-46100) to include a new class of air-quenched, auto-tempered steels that do not
use existing water quench and temper facilities. Allegheny Technologies Incorporated (ATI) developed an auto-tempered steel
alloy, ATI 500-MIL (trademark of ATI Properties, Inc.), that has physical and mechanical properties that meet the current HHA
specification. ARL procured sufficient amounts of ATI 500-MIL plate to allow acceptance testing and subsequent certification
of ATI 500-MIL plate as complying with the First Article requirements of the newly revised MIL-DTL-46100E specification.
This report documents the development of ATI 500-MIL plate and subsequent ballistic testing and inclusion into the
specification as Class-2 auto-tempered HHA steel.
DTIC
Specifications; Steels
20100017308 Army Research Lab., Aberdeen Proving Ground, MD USA
General Corrosion Resistance Comparisons of Medium- and High-Strength Aluminum Alloys for DOD Systems Using
Laboratory-Based Accelerated Corrosion Methods
Placzankis, Brian E.; Sep. 2009; 40 pp.; In English; Original contains color illustrations
Contract(s)/Grant(s): MIPR-6F6NFC1
Report No.(s): AD-A516812; ARL-TR-4937; No Copyright; Avail.: Defense Technical Information Center (DTIC)
ONLINE: http://hdl.handle.net/100.2/ADA516812
Test specimens of various aluminum alloys common to U.S. Department of Defense (DOD) systems or proposed for use
in DOD systems were identically prepared and exposed under bare uncoated conditions in chamber-based, laboratoryaccelerated
corrosion test methods to assess their relative susceptibilities to general corrosion attack. The methods used were
ASTM B 117 neutral salt fog (NSF) and General Motors Standard 9540P (GM 9540P) cyclic accelerated corrosion. The NSF
specimens were compared at intervals of 18, 72, and 168 h. The GM 9540P specimens were assessed at 1, 5, and 10 cycle
intervals. The corrosion assessments were graphically obtained using flatbed scanning techniques.
DTIC
Aluminum Alloys; Corrosion; Corrosion Resistance; High Strength Alloys
20100017803 Savannah River National Lab., Aiken, SC, USA
Investigation of the Potential for Caustic Stress Corrosion Cracking of A537 Carbon Steel Nuclear Waste Tanks
Lam, Poh-Sang; September 2009; 58 pp.; In English
Contract(s)/Grant(s): DE-AC09-08SR22470
Report No.(s): DE2009-966687; SRNS-STI-2009-00564 REV. 0; No Copyright; Avail.: National Technical Information
Service (NTIS)
The evaporator recycle streams contain waste in a chemistry and temperature regime that may be outside of the current
waste tank corrosion control program, which imposes temperature limits to mitigate caustic stress corrosion cracking
(CSCC)1. A review of the recent service history (1998-2008) of Tanks 30 and 32 showed that these tanks were operated in
highly concentrated hydroxide solution at high temperature. Visual inspections, experimental testing, and a review of the tank
service history have shown that CSCC has occurred in uncooled/un-stress relieved F-Area tanks2. Therefore, for the Type
III/IIIA waste tanks the efficacy of the stress relief of welding residual stress is the only corrosion-limiting mechanism. The
objective of this experimental program is to test carbon steel small scale welded U-bend specimens and large welded plates
(12OE12OE1 in.) in a caustic solution with upper bound chemistry (12 M hydroxide and 1 M each of nitrate, nitrite, and
aluminate) and temperature (125 DGC). These conditions simulate worst-case situations in Tanks 30 and 32. Both as-welded
and stress-relieved specimens have been tested. No evidence of stress corrosion cracking was found in the U-bend specimens
after 21 days of testing. The large plate test is currently in progress, but no cracking has been observed after 9 weeks of
immersion. Based on the preliminary results, it appears that the environmental conditions of the tests are unable to develop
stress corrosion cracking within the duration of these tests.
NTIS
Alkalies; Carbon Steels; Corrosion; Cracking (Fracturing); Radioactive Wastes
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