Temperature and early-age mechanical properties in hydrating concrete structures present a significant risk for cracking, having a major impact on concrete durability. In order to tackle these phenomena, a multiscale analysis is formulated. It accounts for a high variety of cement properties, concrete composition, structure geometry and boundary conditions. The analysis consists of two steps. T...

A study of surface hardening Ductile Iron (DI) with and without austempering heat treatment was developed. The chemical composition the material contains alloying elements such as Cu Ni, that allow to obtain a Grade 120-90-02, based on ASTM A536, which treated be transformed Austempered (ADI). Specimens 10 × 5 mm3 were obtained for application by Nd:YAG UR laser 150 W maximum power. parameters ...

Duplex hardening is a process in which conventional heat-treatments such as secondary or case hardening are followed up by surface nitriding to achieve exceptional properties, particularly in the context of aeroengine bearings. Hardness values in excess of 1 000 HV can in principle be achieved, and although the hardness decreases as a function of depth below the surface, some level of enhanceme...

The surface characterization of materials after Robot Laser Hardening (RLH) is a technically demanding procedure. RLH commonly used to harden parts, especially when subject wear. By changing their properties, this treatment can offer several benefits such as lower costs for additional machining, no use cooling agents or chemicals, high flexibility, local hardening, minimal deformation, accuracy...

Local strength of friction stir (FS) welds and FS processed aluminium alloys in heat treatable aluminium alloys is dominated by precipitation hardening. Strengthening due to stored dislocations is generally limited to 40MPa, and grain size strengthening is generally less than 10MPa. Local crystallographic texture can cause yield strength variation on the order of 5%. Published models for streng...