An experimental investigation into the relationship between temperature-time history and surface roughness in the spray quenching of aluminum parts

Article Abstract:

Increases in surface roughness cause respective changes in temperature-time cooling curves for Al-1100 samples, during the single and repeated heat-quench cycles. Compared to the milled surface, cooling curve shifts are more for polished and particle blasted surfaces. Hydrogen diffusion in combination with oxidation, and oxidation buildup are responsible for the enhanced cooling rates for polished and particle blasted surfaces. Microscopic pits, originating due to surface roughness, increase the bubble formation on surfaces.

Analysis, Surface roughness, Cooling curves

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Characterization of a water peening process

Article Abstract:

The surface of 1100 series aluminum specimens was impacted using a traversing water jet in an effort to generate compressive residual stresses on the surface. X-ray diffraction was used to measure stresses induced by the water peening operation. The results yielded compressive stress increases as large as 60% of the monotonic yield strength. Measurements of hardness and surface roughness were also taken. The resulting surface residual stresses were due to sub-surface plastic deformations.

Usage, Strains and stresses, Stresses (Materials), Finite element method, Shot peening

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A mechanical material model for aluminium extrusions during on-line quenching

Article Abstract:

A material model suggests the mechanical characteristics of aluminium extrusion during the process of on-line quenching and restoration to room temperature. A single test gives the material parameters for the AlMgSi aluminum 6060 alloy. The model analyzes the rate-dependent plastic and viscoplastic features at low and high temperatures respectively. Tension and compression is applied on the testing specimen during continuous cooling. The model compares favorably with viscoplasticity.

Models, Materials

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