Abstract Nowadays, the use of different classes materials in same structure is increased to keep pace with innovation and high structural performances. In this context, components made need be joined together a possible solution given by arc welding. Dissimilar welded joints must often able withstand fatigue loads; however, Design Standards provide strength categories only for homogeneous joint...

Abstract The article focuses on the Direct Drive Rotary Friction Welding of ultrafine-grained copper rods, which feature increased mechanical properties and good electrical properties, yet are limited in size. use UFG metals is often by too small dimensions semi-finished elements produced SPD methods. Therefore, production finished machine parts from currently economically unjustified. Dismissa...

The repair of bone defect needs bionic scaffolds that meet biomechanical and bio-structural requirements. triply periodic minimal surface (TPMS) scaffold, with a radial gradient porosity distribution mimicking natural bone, is potential high-performance biomaterial for orthopedic implants. In this paper, TPMS various porosities, which resembled the graded structure human were prepared by select...

The solidification behaviors of laboratory cast austenitic SS2343 stainless steel in terms the volume fraction δ-ferrite as-cast state and its transformation after subsequent annealing were investigated. Monitoring morphological transformations microstructure show progress dissolution. Annealing tests conducted at 1050 °C, 1150 °C 1250 with soaking times 5 40 min. thermodynamic prediction metal...

Introduction: Impact melts resulting from craterproducing impacts on asteroids can be used to understand the collisional evolution of our solar system. Part of that analysis includes an assessment of the cooling rates of the impact melts and/or the locations where the melts are deposited. In this study, we examined LAP 04751 [1], which is an impact melt breccia that came from the H-chondrite pa...

An improved computer simulation program has been developed and used to re-measure the metallographic cooling rates of the IIIAB irons, the largest iron meteorite chemical group. The formation of this chemical group is attributed to fractional crystallization of a single molten metallic core during solidification. Group IIIAB irons cooling rates vary by a factor of 6 from 56 to 338 C/My. The coo...

The carbon contents in carburized steels were investigated by electron probe microanalysis (EPMA) for a range of carbon levels in the solid solution less than 1 wt%. This article describes the difficulties encountered with the classic analytical procedure using the k ratio of X-ray intensities and the phi(rhoz) model. Here, a suitable calibration curve method is presented with emphasis on the m...

2014 Intercepts generated through granular packings by random 1D (line) sections may provide information on the geometry of the medium in a simpler way than metallographic cuts. The method, already tested on hard monosize spherical grain stackings, is used here to determine the average number of necks per grain of a classical model for slightly sintered materials. J. Phys. France 51 (1990) 1897...