Extrusion and Mechanical Properties of Some Molybdenum- and Tungsten-Base Alloys

Item

Title
Extrusion and Mechanical Properties of Some Molybdenum- and Tungsten-Base Alloys
Description
Successful extrusion techniques were developed for several molybdenum-base alloys, tungsten-molybdenum binary alloys, and for unalloyed tungsten. Successful extrusions were performed from 2000 to 3200 F, and at reduction ratios from 4:1 to 8:1. The use of ceramic (Al2O3)-faced extrusion dies was found to reduce the resistance to extrusion and to improve the recovery of sound stock. The problems of die wash and poor bar surfaces associated with high-temperature extrusions through steel dies were circumvented by the ceramic facing.Many of the extruded bars were converted to bar stock by rolling at 2400 F. The degree of success achieved in preparing bar stock from the extruded bars decreased as the amount of tungsten in the alloy increased.Good high-temperature tensile and creep-rupture strengths were displayed by the following alloys:Mo + 1-1/4% Ti + 0.3% Zr + 0.15% C
Mo + 25% W + 0.1% Zr + 0.03% C
Mo + 1-1/2% Cb + 0.5% Ti + 0.3% Zr + 0.3% C.
Strengths of binary alloys of tungsten with 10, 30, or 50% molybdenum were below those of the better molybdenum-base alloys at test temperatures of 2400 F and below. It is postulated that the beneficial effects of tungsten-rich refractory alloys would be realized at higher test temperatures.A relationship has been proposed to describe the effect of exposure time on the recrystallization behavior of unalloyed molybdenum, Mo + 0.50% Ti, Mo + 0.059% Zr, and Mo +0.49% Ti + 0.057% Zr. The effect of externally applied stresses on the recrystallization behavior of these materials is also treated.
Date
1961
Index Abstract
Contrails and DTIC truncated
Photo Quality
Incomplete
Report Number
ASD TR 61-193
Creator
Semchyshen, M.
Barr, Robert Q.
Corporate Author
Climax Molybdenum Company of Michigan
Identifier
AD0267939
AD0267939
Distribution Classification
1
DTIC Record Exists
Yes
Distribution Change Authority Correspondence
None
Report Availability
Full text available by request
Date Issued
1961-06
Abstract
Successful extrusion techniques were developed for several molybdenum-base alloys, tungsten-molybdenum binary alloys, and for unalloyed tungsten. Successful extrusions were performed from 2000 to 3200 F, and at reduction ratios from 4:1 to 8:1. The use of ceramic (Al2O3)-faced extrusion dies was found to reduce the resistance to extrusion and to improve the recovery of sound stock. The problems of die wash and poor bar surfaces associated with high-temperature extrusions through steel dies were circumvented by the ceramic facing.Many of the extruded bars were converted to bar stock by rolling at 2400 F. The degree of success achieved in preparing bar stock from the extruded bars decreased as the amount of tungsten in the alloy increased.Good high-temperature tensile and creep-rupture strengths were displayed by the following alloys:Mo + 1-1/4% Ti + 0.3% Zr + 0.15% C
Mo + 25% W + 0.1% Zr + 0.03% C
Mo + 1-1/2% Cb + 0.5% Ti + 0.3% Zr + 0.3% C.
Strengths of binary alloys of tungsten with 10, 30, or 50% molybdenum were below those of the better molybdenum-base alloys at test temperatures of 2400 F and below. It is postulated that the beneficial effects of tungsten-rich refractory alloys would be realized at higher test temperatures.A relationship has been proposed to describe the effect of exposure time on the recrystallization behavior of unalloyed molybdenum, Mo + 0.50% Ti, Mo + 0.059% Zr, and Mo +0.49% Ti + 0.057% Zr. The effect of externally applied stresses on the recrystallization behavior of these materials is also treated.
Type
report
Provenance
Lockheed Martin Missiles & Fire Control
Subject
Extrusion
Molybdenum Alloys
Refractory Materials
Tungsten Alloys
Additives
Alloys
Creep
Crystallization
Fracture (Mechanics)
Hardness
High Temperature
Mechanical Properties
Microstructure
Niobium
Rupture
Stresses
Tantalum
Tensile Properties
Tungsten
Publisher
Wright-Patterson Air Force Base, OH : Aeronautical Systems Division, Air Force Systems Command, United States Air Force
Format
ix, 107 pages : ill. ; 28 cm.
Laboratory
Materials Central
Contract
AF 33(616)-6929
DoD Project
7351
DoD Task
73512
Distribution Conflict
No
Access Rights
OTS

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