Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 12 of 12 for “"non-metallic inclusions"”.
-
The application of positron emission particle tracking to study non-metallic inclusions in metal castings
To improve the efficiency of turbine aero engines, higher operating temperatures and weight savings are being investigated. Alloys such as RR1000 are being trialled as they perform better at higher temperatures than current nickel-based superalloys. To achieve weight savings, inertia welding is …
-
A study of the microstructural basis for the strength and toughness properties of overaged HSLA-100 steel
… The size, distribution, and composition of non-metallic inclusions were also determined; the inclusion population generally consisted of small, globular, homogeneously dispersed particles. However, exogenous oxides on the order of 50 um were occasionally found as well as slightly brittle …
-
Some aspects of crack initiation in mild steel subjected to fatigue stressing in a corrosive environment
… enriched band of ferrite exists around the non-metallic inclusions and corrosion occurs in this contaminated band with and without applied stress. Cyclic stress enhances the formation and coalescence of micropits at and around the inclusions leading to the nucléation of cracks. Preferential …
-
Investigation into the mechanism of acicular ferrite nucleation in steel weld metal
… was discovered. Acicular ferrite forms on non-metallic inclusions found within the weldment and when significant amounts are "grown", the weldment's toughness and strength approaches that of the steel-base plate. Unfortunately, the mechanism by which high level of acicular ferrite is …
-
A microstructural examination of duplex ferrite -martensite corrosion resisting steels
… annealing. The type and distribution of non-metallic inclusions occurring in 3CR12 has also been assessed. Characteristic fracture modes developed during impact testing have been related to the grain morphology and the occurrence of non-metallic inclusions. It is shown that splits form …
-
An investigation into the role of hydrogen embrittlement in the formation of split bodies in two-piece food cans
… vegetables are not precooked in exhaust boxes. Non metallic inclusions (NMI) was one of the main reason for these split flanges to occur and a reason of particular interest in this research.NMI’s were distributed throughout the steel of the cans and since the same cans were used for the fish and …
-
Relationship between Microstructure, Properties and HICC Resistance of HSLA steel weld metals
… (FEG-SEM and TEM). Microphases, such as non metallic inclusions (NMI) and martensite-austenitecarbide constituent (MAC), were studied in some detail due to their hydrogen trapping capacity. Fractographic studies of hydrogen charged tensile samples were carried out to study the effect of …
-
Hydrogen and helium effects on reduced activation Fe-Cr ferrite-martensite and ODS steels
… in the studied steels initiates preferably from non-metallic inclusions (NMI) such as chromium and tungsten carbide particles. Possible mechanism of hydrogen interaction with NMIs is discussed.
-
Hydrogen embrittlement resistance in advanced high strength: vanadium bearing and TRIP-assisted steels
… analysis confirmed the presence of non-metallic inclusions (NMIs) in 100Cr6+0.5V steel and the disadvantageous effects on its mechanical properties were recorded. A crucial consequence of plastic deformation during RCF is the transformation-induced hydrogen desorption which occurs …
-
Sulfide stress cracking resistance of API-X100 high strength low alloy steel in H2S environments
… was to study the effect of microstructure, non-metallic inclusions and alloying elements of the X100 on H2S corrosion and SSC susceptibility. The study was conducted by means of electrochemical polarization techniques and constant load (proof ring) testing. Microstructural analysis and …
-
Einfluss von Temperatur und Beanspruchungsrate auf das Festigkeits-, Verformungs- und Zähigkeitsverhalten des Stahls G42CrMo4 mit unterschiedlicher Einschlusscharakteristik
Die Wirkung nichtmetallischer Einschlüsse auf das temperatur- und beanspruchungsratenabhängige Festigkeits-, Verformungs- und Zähigkeitsverhalten des Stahls G42CrMo4 wird erforscht. Die im Rahmen des SFB 920 entwickelten Filter mit funktionalisierter Oberfläche dienten der Reinigung einer vorher …