This investigation is concerned to evaluate the influence of heat treatment on mechanical behavior of AISI1040 steel; it is one of the grades of medium carbon steel of American standard containing 0.40% carbon in its composition. Specimen of quenched/hardened AISI1040 steel was tempered at temperature (650,450&250°C) for 60, 90&120 minutes to modify desired properties. The mechanical behavior, ...

Atmospheric corrosion occurs under alternate cycles in presence and absence of an electrolyte layer, the severity of corrosion processes that occur onto the metallic surface depends largely on the corrosive environment to which the material is exposed. Whereas the corrosive phenomena occur in the presence of the electrolyte, in this work the effect of the depth of the solution layer on the elec...

We demonstrate a spray pyrolysis method to grow carbon nanotubes (CNTs) with high degree of crystallinity, aspect ratio and degree of alignment on a variety of different substrates, such as conventional steel, carbon fibres (CF) and ceramics. The process consists in the chemical vapour deposition of both a thin SiO2 layer and CNTs that subsequently grow on this thin layer. After CNT growth, inc...

Tallgrass prairie ecosystems play a vital role in the carbon cycle; their restoration may be an important component of mitigating future climate change. To quantify the biosphere-to-atmosphere exchange of greenhouse gases, enclosure based chamber systems are frequently used because they are simple and inexpensive to construct, and can be easily replicated in a variety of ecosystems. We tested f...

There is an increasing demand for using high sensitive sensors which can detect very low levels of magnetic flux leakage from hidden defects or far-side wall loss due to pitting or local corrosion in ferromagnetic steels. This paper discusses the use of highly sensitive tiny GMR sensors for detection of sub-surface defects in carbon steel plates. Notches located at different depths below surfac...

A transient finite-element model (CON2D) is applied to compute temperature, stress, and distortion of the steel shell during initial solidification. The model incorporates temperaturedependent properties, thermal shrinkage, phase transformations, and different elastic-viscoplastic constitutive equations for each phase (liquid, d, and c). The effects of sudden metal level fluctuations are simula...

This paper presents the mechanical properties of high strength structural steel and mild structural steel at elevated temperatures. Mechanical properties of structural steel at elevated temperatures are important for fire resistant design of steel structures. However, current design standards for fire resistance of steel structures are mainly based on the investigation of hot-rolled carbon stee...

The forming limit diagram (FLD) is probably the most common representation of sheet metal formability and can be defined as the locus of the principal planar strains where failure is most likely to occur. Low carbon steel sheets have many applications in industries, especially in automotive parts, therefore it is necessary to study the formability of these steel sheets. In this paper, FLDs, wer...

Advanced high strength steels (AHSS) have recently attracted great attention because of their superior mechanical properties. A modern group of these steels, known as twinning induced plasticity (TWIP) steels, shows a unique combination of strength and ductility even at high rates of strain. In order to examine the functionality of such steels in dynamic loading conditions, their mechanical beh...

OBJECTIVES The objective was to quantify the blue-light hazard from CO(2) arc welding of mild steel. METHODS The spectral radiance of arcs in CO(2) arc welding of mild steel was measured for solid and flux-cored wires at welding currents of 120-480 A. Effective blue-light radiance and the maximum acceptable exposure duration were calculated from the spectral radiance using their definitions i...