Catalytic removal of NO

Catalytic NOx Abatement Systems for Mobile Sources: From Three-Way to Lean Burn after-Treatment Technologies Pascal Granger* and Vasile I. Parvulescu* Unit e de Catalyse et de Chimie du Solide, UMR CNRS 8181, University of Lille 1, 59655 Villeneuve d’Ascq, France Department of Organic Chemistry, Biochemistry and Catalysis, University of Bucharest, Romania, 412 Regina Elisabeta Boulevard, Bucharest 030016, Romania

Catalytic NOx Abatement Systems for Mobile Sources: From Three-Way to Lean Burn after-Treatment Technologies

Constitutive modeling for elevated temperature flow behavior of 42CrMo steel

http://plast.me.tut.ac.jp/present/joining_CIRP.pdf

Joining by plastic deformation

The double-edge effect of second-phase particles on the recrystallization behaviour and associated mechanical properties of metallic materials

Relationship between stretch formability and work-hardening capacity of twin-roll cast Mg alloys at room temperature

On the sequence of inhomogeneous deformation processes occurring during tensile deformation of strip cast AA5754

A method is disclosed for stretching magnesium-containing aluminum alloy sheet stock into intricate shapes such as are required in automotive body panels. The sheet stock, at a temperature in the range of about 400° C. to about 510° C., is stretched under the pressure of a working gas into conformance with the surface of a forming tool. The sheet forming pressure is increased continually in a controlled manner from ambient pressure to a final forming level in the range of about 250 psi to about 500 psi or higher. A portion of the sheet can experience strain rates substantially higher than 10 −3 sec −1 and the forming of the sheet can be completed within 12 minutes.

Quick plastic forming of aluminum alloy sheet metal

A preliminary investigation of thermomechanical processing of 5083 aluminum plate (Al-4.7%Mg-0.7%Mn) was undertaken to develop a fine-grain sheet for superplastic forming applications. Significant differences in grain size and the extent of superplasticity are seen in hot-rolled vs. cold-rolled sheets, with tensile elongations exceeding 600% for the cold-rolled alloy. Additionally, a separate fine-grain sheet of the same alloy, produced by Alusuisse Co., was studied in greater detail. Superplastic deformation behavior of this sheet was investigated under uniaxial tension over the temperature range of 500–565 °C. Strain rate sensitivity values greater than 0.3 were observed over a strain rate range of (3 × 10−5)–(1 × 10−2) s−1 with a maximum value of 0.65 obtained for strain rate of 5 × 10−4 s−1 at 565 °C. Constant-velocity tension tests consistently show larger strains to failure and lower strain hardening rate than the corresponding “constant-strain-rate” tests for the range investigated. A short but rapid prestraining step, prior to the normal superplastic straining, produced enhanced tensile elongation at all temperatures. Under the two-step schedule, a maximum tensile elongation of 600% was obtained at 550 °C, which was regarded as the optimum superplastic temperature under this condition. This paper and a companion paper are used to provide the details of results obtained to date from this study.

Sooho Kim

Papers

Relationship between stretch formability and work-hardening capacity of twin-roll cast Mg alloys at room temperature

On the sequence of inhomogeneous deformation processes occurring during tensile deformation of strip cast AA5754

Quick plastic forming of aluminum alloy sheet metal

Grain refinement and superplasticity in 5083 Al

Microstructure and texture evolution of Mg alloys during twin-roll casting and subsequent hot rolling