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Full-Text Articles in Metallurgy
Rotating Beam Fatigue Of Forged 2219-T852 Aluminum Alloy, Julio Escamilla, Madison Reed
Rotating Beam Fatigue Of Forged 2219-T852 Aluminum Alloy, Julio Escamilla, Madison Reed
Materials Engineering
2219 aluminum has been used extensively in aerospace applications due to its ability to retain strength in large section thicknesses, thus making it ideal for large forgings. However, the Metallic Materials Properties Development and Standardization (MMPDS) handbook, a source of design data for aerospace industry applications, lacks information on 2219 in the T852 condition, particularly concerning the behavior of the alloy under cyclic loading conditions. Data was collected for forgings of 2219-T852 aluminum as produced by Weber Metals to determine the fatigue life of the alloy-temper combination and to assess the effects of forge thickness and orientation on fatigue life. …
Investigation Of Copper Infiltration Alloys For Use In Metal Matrix Composite Drill Bits, Samuel J. Stueland, Timothy P. Markiewicz
Investigation Of Copper Infiltration Alloys For Use In Metal Matrix Composite Drill Bits, Samuel J. Stueland, Timothy P. Markiewicz
Materials Engineering
A newly developed copper-based alloy, P98-X1 was tested for compressive strength to predict qualitative performance compared to MF53, F-Bronze, CuNiSn, and CuMnNi for use as the infiltration alloy in metal matrix composite (MMC) drill bits. Ingots of each alloy were cast using an arc furnace and cut into compression testing samples using wire electrical discharge machining (EDM). The alloys were selected for testing based on solid solution strengthening coefficient and melting point. Five of each alloy were compression tested to determine yield strength of the infiltration alloy. Yield strength was determined using a 0.002mm displacement offset from the linear elastic …
Microstructural Transformation Of Cold-Sprayed Grcop-42 For Rocket Engine Combustion Chamber Liners, Mason Souther
Microstructural Transformation Of Cold-Sprayed Grcop-42 For Rocket Engine Combustion Chamber Liners, Mason Souther
Materials Engineering
Rocket engines have always relied on high-conductivity copper liners to protect structural components from extreme thermal loads produced by combustion. Forged NARloy-Z has been the material of choice for decades but increasing cost of its constituent silver and high waste in the machining process has reduced the alloy’s cost effectiveness. Aerojet Rocketdyne wants to determine the viability of cold-spray additively manufactured GRCop-42 as a replacement alloy to reduce liner cost. Screening tests were performed to observe the microstructural development and microhardness changes of cold-sprayed GRCop-42 after being subjected to multiple stages of the typical heat treatment of a combustion chamber …
Weld Fracture Between C450 Stainless And C300 Maraging Steels In Golf Club Heads, Emily Oreste, Shea Costner
Weld Fracture Between C450 Stainless And C300 Maraging Steels In Golf Club Heads, Emily Oreste, Shea Costner
Materials Engineering
This project studied fractures along the weld on the face of TaylorMade metalwood golf clubs. The weld joint investigated was between investment cast C450 stainless steel and hot rolled C300 maraging steel that had been joined by plasma arc welding (PAW). Cracking in the welds between these two metals was discovered during in-house prototype testing. To understand the differences between the clubs with intact weld joints and clubs with fractured weld joints, the microstructures throughout the weld zones were imaged and a grid of microhardness values of the entire sample cross-section was generated. The images and hardness values were analyzed …
Investment Cast C450 Microstructural Characterization In Golf Club Heads, Kenneth Yin-Fai Lau
Investment Cast C450 Microstructural Characterization In Golf Club Heads, Kenneth Yin-Fai Lau
Materials Engineering
Two types of tensile bars were observed in this study of golf iron heads for TaylorMade Golf. As-cast and as-cast then machined tensile bars. The tensile bars underwent tensile tests to observe tensile strength, percent elongation, and fracture mechanisms. Furthermore, the hardness of the tensile bars was also taken despite seeing no difference in sample types. However, the as-cast samples did not consistently meet the requirements of percent elongation > 10.00% as there was a sample with 0.00% and another with 1.26%. These samples also showed brittle fracture, instead of the desired cup-and- cone ductile fracture. To investigate further, transverse sections …