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Mechanical and Thermal Properties of Ultra-High Carbon Steel Containing Aluminum
The properties of ultrahigh carbon steels (UHCS) are strongly influenced by aluminum additions. Hardness studies of quenched UHCS-Al alloys reveal that the temperature for the start of transformation increases with increases in aluminum content. It is shown that this change is a function of the atomic percent of solute and of the valence state when comparisons are made with UHCSs containing silicon and tin as solutes. The thermal expansion of UHCSs with dilute aluminum additions shows no discontinuity in the vicinity of the ferrite-austenite transformation temperature. This is the result of a three phase region of ferrite, carbides and austenite. The slope of the expansion curve is higher in the austenite range than in the ferrite range as a result of the dissolution of carbon in austenite with temperature. Processing to achieve a fine grain size in UHCS-Al alloys was principally by hot and warm working (HWW) followed by isothermal warm working (IWW). The high temperature mechanical properties of a UHCS-10Al-1.5C material show nearly Newtonian-viscous behavior at 900 to 1000 C. Tensile elongations of 1200% without failure were achieved in the 1.5%C material. The high oxidation corrosion resistance of the UHCS-10Al materials is described.
Date:
January 31, 2006
Creator:
Syn, C K; Lesuer, D R; Goldberg, A; Tsai, H & Sherby, O D
Object Type:
Article
System:
The UNT Digital Library
NEW HIGH STRENGTH AND FASTER DRILLING TSP DIAMOND CUTTERS
The manufacture of thermally stable diamond (TSP) cutters for drill bits used in petroleum drilling requires the brazing of two dissimilar materials--TSP diamond and tungsten carbide. The ENDURUS{trademark} thermally stable diamond cutter developed by Technology International, Inc. exhibits (1) high attachment (shear) strength, exceeding 345 MPa (50,000 psi), (2) TSP diamond impact strength increased by 36%, (3) prevents TSP fracture when drilling hard rock, and (4) maintains a sharp edge when drilling hard and abrasive rock. A novel microwave brazing (MWB) method for joining dissimilar materials has been developed. A conventional braze filler metal is combined with microwave heating which minimizes thermal residual stress between materials with dissimilar coefficients of thermal expansion. The process results in preferential heating of the lower thermal expansion diamond material, thus providing the ability to match the thermal expansion of the dissimilar material pair. Methods for brazing with both conventional and exothermic braze filler metals have been developed. Finite element modeling (FEM) assisted in the fabrication of TSP cutters controllable thermal residual stress and high shear attachment strength. Further, a unique cutter design for absorbing shock, the densification of otherwise porous TSP diamond for increased mechanical strength, and diamond ion implantation for increased diamond fracture …
Date:
January 31, 2006
Creator:
Radtke, Robert
Object Type:
Report
System:
The UNT Digital Library
[News Clip: 18 wheeler accident]
B-roll video footage from the NBC 5 television station in Fort Worth, Texas, to accompany a news story.
Date:
January 31, 2006, 6:00 a.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: 18 wheeler crash]
B-roll video footage from the NBC 5 television station in Fort Worth, Texas, to accompany a news story.
Date:
January 31, 2006, 4:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: African American Museum]
B-roll video footage from the NBC 5 television station in Fort Worth, Texas, to accompany a news story.
Date:
January 31, 2006, 6:00 a.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Air fares]
Video footage from the NBC 5 television station in Fort Worth, Texas, to accompany a news story.
Date:
January 31, 2006, 4:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Alito confirmation]
Video footage from the NBC 5 television station in Fort Worth, Texas, to accompany a news story.
Date:
January 31, 2006, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Alito nomination]
Video footage from the NBC 5 television station in Fort Worth, Texas, to accompany a news story.
Date:
January 31, 2006, 6:00 a.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Alito vote]
Video footage from the NBC 5 television station in Fort Worth, Texas, to accompany a news story.
Date:
January 31, 2006, 6:00 a.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: All girl assembly]
B-roll video footage from the NBC 5 television station in Fort Worth, Texas, to accompany a news story.
Date:
January 31, 2006, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: All girl assembly]
Video footage from the NBC 5 television station in Fort Worth, Texas, to accompany a news story.
Date:
January 31, 2006, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Anim - Developing story]
Video footage from the NBC 5 television station in Fort Worth, Texas, to accompany a news story.
Date:
January 31, 2006, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Arlington child death]
B-roll video footage from the NBC 5 television station in Fort Worth, Texas, to accompany a news story.
Date:
January 31, 2006, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Arlington hanging]
Video footage from the NBC 5 television station in Fort Worth, Texas, to accompany a news story.
Date:
January 31, 2006, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Arlington hanging]
B-roll video footage from the NBC 5 television station in Fort Worth, Texas, to accompany a news story.
Date:
January 31, 2006, 4:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Arlington hanging]
Video footage from the NBC 5 television station in Fort Worth, Texas, to accompany a news story.
Date:
January 31, 2006, 4:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Arlington hanging]
B-roll video footage from the NBC 5 television station in Fort Worth, Texas, to accompany a news story.
Date:
January 31, 2006, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Bellydance workout]
Video footage from the NBC 5 television station in Fort Worth, Texas, to accompany a news story.
Date:
January 31, 2006, 4:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Brian's blog]
B-roll video footage from the NBC 5 television station in Fort Worth, Texas, to accompany a news story.
Date:
January 31, 2006, 4:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Buckner major accident]
B-roll video footage from the NBC 5 television station in Fort Worth, Texas, to accompany a news story.
Date:
January 31, 2006, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Buckner major accident]
Video footage from the NBC 5 television station in Fort Worth, Texas, to accompany a news story.
Date:
January 31, 2006, 4:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Bull into crowd]
Video footage from the NBC 5 television station in Fort Worth, Texas, to accompany a news story.
Date:
January 31, 2006, 6:00 a.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: CA post office shoot]
Video footage from the NBC 5 television station in Fort Worth, Texas, to accompany a news story.
Date:
January 31, 2006, 12:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: CA post office shooting]
Video footage from the NBC 5 television station in Fort Worth, Texas, to accompany a news story.
Date:
January 31, 2006, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library