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Viewing 1 to 30 of 9882
Technical Paper
2014-09-30
Balakrishnan Natesan
Abstract Phosphorous is an important alloying element in powder metallurgy applications. It is used in Powder metal parts for effective Sintering, dimensional stability, improved machinability, corrosion resistance etc. However it does have some negative effects on properties of Powder metal parts. The purpose of the paper is to study the effect of phosphorous on Powder metal gear of Mix A and Mix B having identical composition differing only in phosphorous content. The samples were detailed on each stage, viz. sintering & Heat treatment. In addition two defective samples were studied to observe the extent to which phosphorous may deteriorate the Powder metal Gear.
Technical Paper
2014-09-28
Abdulwahab A. Alnaqi, Suman Shrestha, David C. Barton, Peter C. Brooks
Abstract Aluminium alloys have been used extensively in the automotive industry to reduce the weight of a vehicle and improve fuel consumption which in turn leads to a reduction in engine emissions. The main aim of the current study is to replace the conventional cast iron rotor material with a lightweight alternative such as coated aluminium alloy. The main challenge has been to meet both the cost and functional demands of modern mass-produced automotive braking systems. A sensitivity analysis based on the Taguchi approach was carried out to investigate the effect of various parameters on the thermal performance of a typical candidate disc brake. Wrought aluminium disc brake rotors coated with alumina on the rubbing surfaces were determined to have the best potential for replacing the conventional cast iron rotor at reasonable cost. Optimisation of the structure was subsequently carried out using a genetic algorithm on the selected coated aluminium disc brake rotor. This determines the optimum thickness of the coating and the composition of the substrate based on selected criteria.
WIP Standard
2014-09-23
1) Retain section heading "Response to Heat Treatment" when solution treatment is performed. 2) Change section heading to "Response to Temper Conversion" when precipitation aging is the only thermal processing performed. In this instance, also include a clear description of the Starting Temper and Ending Temper - examples: "Response to Heat Treatment The product, after solution and precipitation heat treatment to the T62 temper (See AS1990) in accordance with AMS 2772, shall have the properties listed in Table X." "Response to Temper Conversion Product in the T4 temper, precipitation heat treated to the T62 temper (See AS1990) in accordance with AMS2772, shall have the properties shown in Table Y."
Standard
2014-09-19
This specification covers an aluminum alloy in the form of extruded bars, rods, wire, profiles, and tubing. These extrusions have been used typically for structural parts requiring high strength up to 500 degrees F (260 degrees C), but usage is not limited to such applications. May be welded in the specified condition but properties are improved by reheat treatment after welding. Reheat treatment after welding, however, may reduce resistance to stress-corrosion cracking.
Technical Paper
2014-09-16
Joshua Norman, Cesar Moreno, Zhiyu Wang, James Mann, Christopher Saldana
Abstract The beneficial effects of contact disruption in modulation-assisted machining of aerospace alloys have been well documented, but sources for such improvements are not well understood. This study explores the underlying nature of differences that occur in energy dissipation during conventional and modulation-assisted machining by characterizing the relationship between controllable process parameters and their effects on chip formation. Simultaneous in situ force and tool position measurements are used to show that the forces in modulation-assisted machining can be described by empirical force models in conventional machining conditions. These models are found to accurately describe plastic dissipation over a range of modulation conditions and configurations, including in cases where energy expenditure decreases with the application of modulation. These observations suggest that the underlying response in modulation-assisted machining is analogous to that of conventional machining.
Standard
2014-09-11
This specification covers an aluminum alloy in the form of plate products from 1.000 to 6.000 inches (152.40 mm) in thickness. 7065-T7451 may be used in aerospace applications requiring high strength and fracture toughness, high resistance to stress-corrosion cracking and good resistance to exfoliation corrosion, but usage is not limited to such applications.
Standard
2014-09-11
This specification covers an aluminum alloy in the form of plate products from from 1.000 to 6.000 inches (152.40 mm) in thickness. 7065-T7651 may be used in aerospace applications requiring high strength and good fracture toughness, good resistance to stress-corrosion cracking and to exfoliation corrosion, but usage is not limited to such applications.
Standard
2014-08-20
This procurement specification covers aircraft-quality bolts and screws made of corrosion and heat resistant, age hardenable nickel base alloy of the type identified under the Unified Numbering System as UNS N07718. The following specification designations and their properties are covered: AS7466 185 ksi minimum ultimate tensile strength at room temperature. 155 ksi minimum ultimate tensile strength at 800 °F.> 105 ksi tension to 10.5 ksi tension fatigue at room temperature. AS7466-1 185 ksi minimum ultimate tensile strength at room temperature. 111 ksi minimum ultimate shear strength at room temperature.
Standard
2014-08-11
This specification covers an aircraft quality, low alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.
WIP Standard
2014-08-11
This specification covers steel cleanliness requirements in inch/pound units for premium aircraft-quality ferromagnetic steels, other than hardenable, corrosion-resistant steels, by magnetic particle inspection methods.
WIP Standard
2014-08-11
This specification covers procedures for sampling and testing aircraft-quality, special aircraft-quality, and premium aircraft-quality requiring transverse tensile property testing.
WIP Standard
2014-08-11
This specification covers steel cleanliness requirements in inch/pound units for special aircraft-quality ferromagnetic steels, other than hardenable corrosion resistant steels, by magnetic particle inspection methods.
WIP Standard
2014-08-11
This specification covers steel cleanliness requirements inch/pound units for aircraft-quality ferro-magnetic steels, other than hardenable corrosion-resistant steels, by magnetic particle inspection methods.
WIP Standard
2014-08-11
This specification covers the requirements for heat-treatment of four classes of steel (See 1.2) and the requirements for furnace equipment, test procedures and information for heat-treating procedures, heat-treating temperatures and material (See 6.3) test procedures. This specification is applicable only to the heat treatment of raw material (See 6.3.1); it does not cover the requirements for the heat treatment of steel parts (See 3.4 and 6.3.2). This specification also describes procedures that, when followed, will produce the desired properties and material qualities within the limitations of the respective alloys tabulated in Tables 1A, 1B, 1C and 1D. Alloys other than those specifically covered herein may be heat treated using all applicable requirements of this specification.
Standard
2014-08-11
This specification covers an aircraft-quality, low-alloy steel in the form of bars, forgings, and forging stock.
WIP Standard
2014-08-07
Form: This specification covers an aluminum alloy in the form of an extrusion. Application: This product has been used in aerospace applications requiring a combination of high strength and compressive properties and with good corrosion resistance, but usage is not limited to such applications.
WIP Standard
2014-08-07
This specification covers an aluminum alloy in the form of sheet and plate.
Magazine
2014-08-01
3-D manufacturing of titanium components takes off MRO providers are discovering ways to innovate their procedures while remaining viable and profitable through the current downturn in government spending. Commercial programs are flying high With economic regeneration underway this year, the rate of ordering new aircraft has been at an all-time high, with the result that backlogs for undelivered new production stretch well into the next decade for some popular models.
Standard
2014-07-31
This specification covers a titanium alloy in the form of sheet, strip, and plate.
Standard
2014-07-31
This specification covers an aircraft-quality, low-alloy steel in the form of bars, forgings, and forging stock.
Standard
2014-07-29
This specification covers a premium aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, flash welded rings, and stock for forging or flash welded rings.
Standard
2014-07-29
This specification covers an aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.
Standard
2014-07-29
This specification covers a premium aircraft-quality, maraging steel in the form of bars, forgings, mechanical tubing, flash welded rings, and stock for forging or flash welded rings.
Standard
2014-07-29
This specification covers an aircraft quality nitriding grade low alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.
Standard
2014-07-29
This specification covers a premium aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.
Standard
2014-07-29
This specification covers an aircraft quality, low alloy steel in the form of heat treated bars and forgings, and of forging stock.
Standard
2014-07-28
This specification covers an aluminum or aluminum alloy in the form of sheet, laminated and edge bonded.
Standard
2014-07-25
This specification covers the specific requirements for 7075 aluminum alloy bar, rod, wire, and special shapes produced by rolling, drawing, or cold finishing.
WIP Standard
2014-07-24
This specification covers an aluminum alloy in the form of extruded profiles.
Standard
2014-07-23
This specification covers a premium aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.
Viewing 1 to 30 of 9882

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