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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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The effect of electrical current on premature failures and microstructural degradation in bearing steel
Premature failures associated with microstructural degradation, i.e. white etching cracks (WECS), are becoming commonplace as applications are requiring tribological components to operate under extreme conditions. Although the specific drivers of WECs are still debated, the failures are often found in applications where cyclic loading is combined with added energy from stressors such as slip, impacts, or stray current. The aim of the current work is to elucidate effect that variable current has on premature failure. Numerous commercially available lubricants were tested, and both lubricant base oil type and additive package were found to have an effect on WEC failure time.
Explosive welding of aluminium to stainless steel using carbon steel and niobium interlayers
Not Available
Fatigue crack growth resistance of the austenitic stainless steel Alloy 709 at elevated temperatures
Not provided.
Multimodal Imaging of the Evolving Interface of Irradiated Aluminide-coated Stainless-steel Cladding
Here, we will present recently peer-reviewed results to showcase the advanced multimodal imaging capabilities developed to study irradiated materials at the Pacific Northwest National Laboratory. Irradiated cladding samples selected to support the tritium science and technology program will be used as an example to demonstrate the multimodal imaging capabilities.
Measuring Fatigue Crack Growth Behavior of Ferritic Steels Near Threshold in High Pressure Hydrogen Gas.
Abstract not provided.
Effect of Variables in Welding Technique on the Strength of Direct-current Metal-arc-welded Joints in Aircraft Steel II : Repeated-stress Tests of Joints in SAE 4130 Seamless Steel Tubing
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Effect of Variables in Welding Technique on the Strength of Direct-current Metal-arc-welded Joints in Aircraft Steel I : Static Tension and Bending Fatigue Tests of Joints in SAE 4130 Steel Sheet
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Axial-load fatigue tests on notched and unnotched sheet specimens of 61S-T6 aluminum alloy, annealed 347 stainless steel, and heat-treated 403 stainless steel
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Heat Transfer Tests of a Steel Cylinder Barrel with Aluminum Fins with Improved Bonding Between Steel Barrel and Aluminum Base
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An Electron and X-ray Diffraction Investigation of Surface Changes on Nitrided-steel Piston Rings During Engine Operation in Nitrided-steel Cylinders Barrels
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Increase of the Specific Load Under Tension, Compression, and Buckling of Welded Steel Tubes in Airplane Construction by Suitable Treatment of Structural Steel and by Proper Design
The new construction method indicated, which makes possible a considerably better material utilization and hence a saving in weight, has been tested in a number of Focke-Wulf types also in series production and has fully justified itself.