Concept

Acier au carbone

Publications associées (324)

Fracture properties of notched and pre-cracked specimens of a tempered martensitic steel at low temperature

Philippe Spätig, Raul Alejandro Bonadé, Pablo Federico Mueller

The fracture properties of the 9CrWVTa reduced-activation tempered martensitic steel Eurofer97 were studied in the lower ductile to brittle transition. Sub-sized pre-cracked compact tension and notched tensile specimens were tested. Finite element simulati ...

2008

A probabilistic assessment of the effect of post-weld treatment on the fatigue performance of tubular truss bridges

Alain Nussbaumer, Scott Walbridge

In the design of tubular truss bridges, engineers have found the fatigue performance of the joints to be a critical aspect. In looking for ways to improve this performance, the use of residual stress-based post-weld treatments has been suggested. Although ...

Elsevier2008

Methodology for evaluating new high volume composite manufacturing technologies

Simon Jespersen

Composite materials are increasingly used in high volume automotive applications, usually as a replacement for assemblies of multiple metallic parts such as stamped and spot-welded steel sheets. One of the motivations is to reduce tooling and assembly cost ...

EPFL2008

Fracture toughness of TiAl alloys: A comparison of two gamma-a2 structures

Andreas Mortensen, Frédéric Diologent, Nicolas Vincent Barbi

Toughness measurements of a Ti-45Al-2N4u-2Nb + 0.8%vol TiB2 alloy with a. near fully lamellar microstructure and a Ti-46Al-8Nb alloy with a convoluted microstructure are performed at 650 degrees C under vacuum according to ASTM Standard E1820. Respective v ...

MINERALS, METALS & MATERIALS SOC2008

3D Nanostructured Silicon Relying on Hard Mask Engineering for High Temperature Annealing (HME-HTA) Processes for Electronic Devices

Mihai Adrian Ionescu, Matthieu Bopp

Annealing silicon at high temperatures in hydrogen ambiance has been reported to induce surface diffusion of silicon; in these conditions, adapted 2D arrays of trenches etched in Bulk Si are transformed into buried cavities creating suspended membranes. A ...

2008

Silicon nanostructuring for 3D bulk silicon versatile devices

Mihai Adrian Ionescu, Matthieu Bopp

A fabrication method for silicon beams and membranes defined in lateral and vertical dimensions, as well as superposed silicon membranes, all realized in bulk silicon using only one lithographic step is proposed. This proposal is based on observations made ...

2008

Photon Antibunching in the Photoluminescence Spectra of a Single Carbon Nanotube

Christophe Marcel Georges Galland

We report the first observation of photon antibunching in the photoluminescence from single carbon nanotubes. The emergence of a fast luminescence decay component under strong optical excitation indicates that Auger processes are partially responsible for ...

American Physical Society2008

High performance low-firing temperature thick-film pressure sensors on steel

Peter Ryser, Thomas Maeder, Caroline Jacq, Giancarlo Corradini, Niklaus Johner

Performance of piezoresistive thick-film pressure sensors on steel substrates is hindered by the high required firing temperatures of the layers, which cause degradation of the substrate mechanical properties. Special steels or alloys that are relatively u ...

2007

Effect of irradiation on the microstructure and the mechanical properties of oxide dispersion strengthened low activation ferritic/martensitic steel

Nadine Baluc, Amuthan Ramar

Ferritic/martensitic (F/M) steels show good resistance to swelling and low damage accumulation upon irradiation relative to stainless steels. 0.3 wt% yttria particles were added to the F/M steel EUROFER 97 to produce oxide dispersion strengthened (ODS) ste ...

2007

Mechanical properties of carbon-modified silicon oxide barrier films deposited by plasma enhanced chemical vapor deposition on polymer substrates

Yves Leterrier, Grégory Tornare

Cohesive and adhesive properties of silicon oxide barrier coatings deposited from an oxygen/hexamethyldisiloxane gas mixture by plasma enhanced chemical vapor deposition, with controlled incorporation of carbon on 12 mm thick polyethylene terephtalate film ...

2007

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