In this paper we have proposed an experimental study of the steel grains sizes effect on the shift frequency of the ultrasonic waves being propagated in steels. Ultrasonic testing has been used in most inspection services for different materials as non-destructive testing. The novelty of our research work has been focused on the investigation of the new method for determining microstructure evolution of metals by using ultrasonic signals in conjunction with changes in grain size and hardness of steels. Furthermore, we have studied the microstructure of steel types S355, S275, Corten B and S275N. The microstructure results of steels have shown the changes that have been undergone from thermal and mechanical processes by using the attenuation of ultrasound waves during non-destructive testing.

The authors of this paper propose a practical way to assess the environmental and financial costs of the performance of a real engineering activity for the case of a dwelling/building. This estimation is based on two indicators: Energy consumption during the Life Cycle of the building, E c LC and Equivalent Uniform Annual Cost, EUAC, related in various ways within the Building Life Cycle. The first indicator is determined by the Material Selection Method (CES Eco-Selector Software). While second indicator, EUAC, is determined by means of the Method of Life Cycle Cost. Consideration of these indicators from the conceptual phase of the object (dwelling), minimizes the costs of implementation and usage of the dwelling while respecting the principles of environment sustainable development. A dwelling as a product may have an environmental label, containing these two environmental and financial indicators, determined to take into account the entire life cycle. Results confirm the validity of some of the most innovative technologies currently applied in buildings and support our proposal on their energy label change.

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