High temperature low-cycle fatigue of friction welded joints-type 304-304 stainless steel and alloy 718-718 nickel base superalloy

Article Abstract:

The high-temperature, low-cycle fatigue strength of friction-welded joints are studied. Experiments are carried out wherein welded specimens of Type 304 austenitic stainless steel and Alloy 718 nickel-base superalloy are subjected to axial and diametral strains using an extensometer. Results reveal that Type 304-304 welded specimens have a lower fatigue strengththan the base metal. The fatigue lives of Alloy 718-718 specimens are found to be the same as that of the base metal.

Research, Pressure welding

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Microscopic damage mechanism of nickel-based superalloy inconel 738LC under creep-fatigue conditions

Article Abstract:

Results demonstrate that a compressive hold period intervention reduces the creep-fatigue life. The grain boundary sliding damage is independent of the strain hold period duration and noticeable even at very short hold periods. The creep-fatigue cracks propagate along the grain boundary whereas the fatigue cracks propagate through the grains.

Statistical Data Included, Testing, Metals, Metals (Materials), Creep (Materials), Metals, Effect of temperature on, Grain boundaries, Nickel alloys

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Evaluation of thermal aging embrittlement in directionally solidified Ni-base superalloy by small punch test

Article Abstract:

The investigation of the change in small punch (SP) fracture energy due to thermal aging is discussed. Results revealed that SP fracture energy at room temperature declined with aging at 800 degree Celsius and is uniquely correlated with high-temperature Charpy impact toughness.

All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Nickel Compounds, Thermal properties, Mechanical properties, Thermal analysis

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