Analysis of the dynamic evolution of multilevel structure during martensitic transformations provides kinetics-based constitutive relations for transformation plasticity. Application in numerical modeling of ductile fracture by microvoid-softening-induced shear localization, in conjunction with metallographic study of crack-tip processes, identifies transformation toughening mechanisms operatin...

Fig. 2 Microstructure of as-cast Au22%Al showing the “purple plague,” AuAl2 intermetallic (reddish), surrounded by the Al-AuAl2 eutectic after polishing to a 1 lm finish. Magnification bar is 50 lm long. Fig. 1 Microstructure of a porous high-carbon steel powder metallurgy specimen infiltrated with copper showing the natural color of the copper, which is easier to see when the steel has been ti...

The basic prerequisite for obtaining the coating of good quality is production a layer without occurrence surface defects. A possible solution to defects on functional form application polytetrafluoroethylene (PTFE)-based coating. helps reduce roughness and “smooth” like pores micro-shrinkage. For this reason, new type methodology were prepared achieve more cycles between individual cleaning pr...

An experimental study has been carried out on the high temperature oxidation behavior of pre-oxidized Zircaloy-4. Prior to steam oxidation, cladding tubes have in moistened oxygen environment at 425 °C, up pre-oxide layer thicknesses 36 and 63 µm. All samples then subjected isothermal 900 °C-1200 °C range, followed by water-quenching. Metallographic examinations mean hydrogen content measuremen...

Based on the metallographic studies of undercarriage wheels, which are operated within different periods time and have types degrees wear, it can be concluded that steel with chemical composition close to eutectoid one, equilibrium crystal lattice, should used for manufacturing. The microstructure working surfaces wheels fine pearlite, ideally sorbitol (fine type pearlite). These requirements m...

Abstract Modern hot sheet metal forming processes offer the opportunity, especially in automotive sector, to meet current demands for ultra-lightweight design. Due increased formability at high process temperatures, high-strength aluminium alloys are increasingly coming into focus of industry. However, complex thermo-mechanical interactions within these can lead undesirable microstructural chan...

In this study, boriding process was carried out on Ø11 mm diameter DIN 20MnCr5 quality steel bars, used in chain elements such as links and rings, fasteners bolts, at 950oC boronizing temperature, times of 2.5 7.5 hours. the formation growth boride layer metallographic structure, coating thickness corrosion properties boronized steels were investigated depending conditions. box process, Ekabor-...

The cause of crack initiation turbine blade had initially cracked by a fatigue mechanism over a period of time and then fractured by the overload at the last moment. Experimental procedure consists of macroscopic inspection, material verification, microscopic examination, and metallographic analysis and finally FE. And for these procedures, some specimens were prepared from a fractured blade. Us...