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Technical Paper

HSCR Steel Competes with 300M Steel

2022-03-08
2022-01-0052
Aircraft landing gears and structures have stringent performance requirements. They are subjected to severe loads, corrosion, and adverse environmental conditions, and have complex shapes which vary in thickness. 300M steel is widely used for high stress aircraft landing gears and structures. This steel is not corrosion-resistant and requires protective coatings. Plating of 300M steel involves using cadmium for corrosion resistance on external surfaces and chrome for wear resistance on internal surfaces. New restrictions have listed cadmium and chrome coatings as substances of concern due to the environmental and health risks associated with the manufacturing of cadmium and chrome coatings. Recently, a new alternative non-toxic zinc-nickel coating is being developed, however, the zinc-nickel coating does not solve the corrosion problem if it cracks.
Technical Paper

Influence of hot extrusion on microstructure and slurry erosive behaviour of Al6061-Si3N4-Cf hybrid composite

2022-03-08
2022-01-0049
In recent decades, silicon nitride (Si3N4) & carbon fibres (Cf) have been the most popular reinforcements in the production of MMCs due to their superior wear & corrosion resistance. Al6061 is the most sought after matrix alloy owing to its excellent formability among all Al alloys. Several researchers have reported on sliding wear and corrosion properties of cast composite with Cf & Si3N4 as reinforcements but limited information is available related to slurry erosive wear behaviour of hot extruded hybrid MMCs with Cf as one of the reinforcement. In the light of above, the current work is aimed at investigating the erosive wear behaviour of Al6061 dispersed with Si3N4 (6 wt %) and Cf (1 wt %) hybrid MMC after hot extrusion. Stir casting was used to disperse electroless Ni coated with Si3N4 & copper coated with Cf in Al6061 followed by hot extrusion. Microstructural studies were conducted on cast & hot extruded alloy, it's composite & hybrid composite.
Technical Paper

Impact of soft magnetic ageing on the performance of Aerospace Propulsion Machines

2022-03-08
2022-01-0050
Electric machines in aerospace applications are subjected to extremely high operating temperatures. The magnetic characteristics of soft magnetic materials are impaired by the precipitation of fine second-phase particles at such high temperatures. This is reflected on the performance of electrical steels in the form of increased coercivity or decreased saturation flux density and thereby, increased core loss. Impact of ageing varies in different materials. The need for high power density and increased operating speed favours the use of thin gauge Silicon Steel (Si-Fe) and Cobalt iron (Co-Fe) laminations for aerospace applications. Therefore, the variation in iron loss is studied for three thin gauge Si-Fe and two Co-Fe laminations by subjecting them to controlled ageing in laboratory. Based on the available literature, ageing is found to stabilize within 30 hrs of operation. Hence, the study analyses aging at 10 hrs, 20 hrs, 30 hrs, 40 hrs and 50 hrs.
Technical Paper

Development of zinc and low carbon steel coatings on ABS plastic by electric arc spraying

2022-03-08
2022-01-0057
Acrylonitrile Butadiene Styrene (ABS) is one of the most sought after engineering plastic for industrial applications especially in the modern aircrafts. Due to its high strength, thermal resistance, dimensional stability, processing ability and affordability, the aircraft interior parts are made up of ABS plastic. However for heavy-duty industrial applications which require corrosion resistance, abrasion resistance and durability, the ABS plastic is not a great choice. Several studies have reported on surface metallization of ABS plastic using conventional electroplating and electroless but meagre information is available as regards use of thermal spray technique. This opens up a huge scope to conduct research in this area using most commonly used materials like zinc and low carbon steel. In the light of the above, the present work attempts to coat zinc and low carbon steel on ABS plastic using electric arc spray technique.
Technical Paper

Impact of stator segmentation on the performance of aerospace propulsion machines

2022-03-08
2022-01-0039
Electric machines with a high power density are required for aerospace applications. Halbach permanent magnet machines using rare earth magnets with high remanent flux density and soft magnetic materials having high saturation flux density are used to achieve the power density targets of aerospace industry. The need for high saturation flux density necessitates the use of cobalt iron lamination over the conventional silicon steel. However, cobalt iron is very expensive i.e. order of 10 in comparison to silicon steel. In addition, cobalt iron is used only for the stator lamination. Therefore, the conventional method of stator fabrication as a single piece results in enormous wastage of high performance and expensive cobalt iron lamination. Consequently, alternate topologies like segmented stators are developed to minimize the wastage of soft magnetic materials. Segmentation is achieved by splitting the stator yoke or teeth.
Standard

Steel, Corrosion-Resistant, Bars, Wire, Forgings, Mechanical Tubing, and Rings 16Cr- 4.0Ni - 0.30Cb (Nb) - 4.0Cu Solution and Precipitation Heat Treated (H925)

2022-01-17
WIP
AMS5643/H925A

This specification covers a corrosion-resistant steel product 8 inches (203 mm) and under in nominal diameter, thickness or for hexagons, least distance between parallel sides, and having a maximum cross-sectional area of 64 square inches (413 cm2) in the solution and precipitation heat treated (H925) condition.

Standard

Steel, Corrosion-Resistant, Bars, Wire, Forgings, Mechanical Tubing, and Rings 16Cr- 4.0Ni - 0.30Cb (Nb) - 4.0Cu Solution and Precipitation Heat Treated (H900)

2022-01-17
WIP
AMS5643/H900A

This specification covers a corrosion-resistant steel product 8 inches (203 mm) and under in nominal diameter, thickness or for hexagons, least distance between parallel sides, and having a maximum cross-sectional area of 64 square inches (413 cm2) in the solution and precipitation heat treated (H900) condition.

Standard

Steel, Corrosion-Resistant, Bars, Wire, Forgings, Mechanical Tubing, and Rings 16Cr- 4.0Ni - 0.30Cb (Nb) - 4.0Cu Solution and Precipitation Heat Treated (H925)

2022-01-14
CURRENT
AMS5643/H925
This specification covers a corrosion-resistant steel product 8 inches (203 mm) and under in nominal diameter, thickness or for hexagons, least distance between parallel sides, and having a maximum cross-sectional area of 64 square inches (413 cm2) in the solution and precipitation heat treated (H925) condition.
Standard

Bearings, Roller, Needle, Airframe, Antifriction, Inch

2022-01-14
CURRENT
AS39901C
This standard covers the requirements for non-separable, airframe anti-friction needle bearings, corrosion resistant and traditional materials, intended for use in flight vehicle control systems, with radial loads.
Standard

Steel, Corrosion-Resistant, Bars, Wire, Forgings, Mechanical Tubing, and Rings 16Cr- 4.0Ni - 0.30Cb (Nb) - 4.0Cu Solution and Precipitation Heat Treated (H900)

2022-01-14
CURRENT
AMS5643/H900
This specification covers a corrosion-resistant steel product 8 inches (203 mm) and under in nominal diameter, thickness or for hexagons, least distance between parallel sides, and having a maximum cross-sectional area of 64 square inches (413 cm2) in the solution and precipitation heat treated (H900) condition.
Standard

Steel, Corrosion-Resistant, Bars, Wire, Forgings, Mechanical Tubing, and Rings 16Cr - 4.0Ni - 0.30Cb (Nb) - 4.0Cu Solution and Precipitation Heat Treated (H1100)

2022-01-14
CURRENT
AMS5643/H1100A
This specification covers a corrosion-resistant steel product 8 inches (203 mm) and under in nominal diameter, thickness or for hexagons, least distance between parallel sides, and having a maximum cross-sectional area of 64 square inches (413 cm2) in the solution and precipitation heat treated (H1100) condition.
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