In this paper, the microstructure, the room-temperature and high-temperature tensile mechanical properties of monolithic TA15 alloy and TiB whisker-reinforced TA15 titanium matrix composites (TiBw/TA15) fabricated by vacuum hot-pressing sintering were investigated. The microstructure results showed that there were no obvious differences in the microstructure between monolithic TA15 alloy and Ti...

Abstract Tungsten and tungsten-based alloys are the leading material choices for divertor plasma facing components (PFCs) in future fusion reactors. Recrystallization may occur when they undergo high heat loads, drastically modifying predesigned grain structures associated desired mechanical properties. However, influence of recrystallization on thermal fatigue behavior tungsten PFCs still rema...

Thermal stability of the dislocation cellular structure and precipitation behavior chromium carbide (M23C6), silicide (Mo3Si), σ phase in austenitic 316L stainless steel (SS) fabricated by laser powder bed fusion (L-PBF) additive manufacturing (AM) were studied at 500–800 ℃. The hardness remained stable 500 ℃ 600 for up to 400 h. However, regional coarsening resulted a slight reduction after 10...

Conventional quenching and tempering were employed to achieve the optimal strength toughness of low-carbon low-alloy steel. The fracture behavior (crack initiation propagation) steel in impact process was also analyzed. It found that microstructures after different treatments mainly composed martensite, its mechanical properties dependent on temperature. With increase temperature, martensitic l...

Shielded metal arc welding and thermal simulation experiment were carried out for constructional steel containing 0% V 0.10% V, the microstructure, precipitation feature, microhardness HV0.2, −20 °C impact value in heat affected zone (HAZ) investigated. The results showed that coarse-grained (CGHAZ), N completely dissolved matrix of to promote growth prior austenite grains, meanwhile fraction h...

Abstract FeCo alloys are important materials used in pumps and motors the offshore oil gas drilling industry. These subjected to marine environments with a high NaCl concentration, therefore, corrosion catastrophic failure anticipated. So, surface dissolution of additively manufactured samples is investigated quasi- situ manner, particular, pitting 5.0 wt pct solution. The local same sample reg...

The effect of carbon content in the base metals high-strength steel on microstructure and impact toughness simulated welding focusing a coarse-grained heat-affected zone (CGHAZ) at different heat inputs was systematically investigated by using scanning electron microscopy (SEM) back-scattering diffraction (EBSD). Charpy test confirmed that there an optimal input, which caused CGHAZ to obtain hi...

Equal channel angular pressing (ECAP) is carried out using two different configurations for the exit channel of the ECAP die, i.e., relieved and choked, with angles of 0.2 °. It is found that using a die with relieved exit channel, the sample was extruded for 6 passes with no surface cracks and an average cell size of 727 nm and a fraction of high angle grain boundaries of 54 % were achieved. M...

Beta-phase gallium oxide (β-Ga2O3) has attracted attention in recent years as a potentially low cost, large area substrate and active layer material for high power, temperature power electronics sensing devices. However, growth of β-Ga2O3 crystals is complicated by easily activated (100) (001) cleavage planes, the presence angle grain boundaries (LAGBs) twins, potential formation polycrystallin...

The 420 MPa grade offshore engineering steels with the different Mo contents were fabricated through Ca deoxidation. effect of content on microstructure and impact toughness coarse-grained heat-affected zone (CGHAZ) after welding heat input 100 kJ/cm investigated by simulation high-temperature laser scanning confocal microscopy (HTLSCM). As is increased from 0.08 to 0.16 wt%, at ?40°C 15 160 J,...