Search results for: Sophie Primig

Items from 1 to 20 out of 21 results

article

Review of Microstructure–Mechanical Property Relationships in Cast and Wrought Ni‐Based Superalloys with Boron, Carbon, and Zirconium Microalloying Additions

Felix Theska, Wilson F. Tse, Bernd Schulz, Richard Buerstmayr, more

Advanced Engineering Materials > 25 > 8 > n/a - n/a

Cast and wrought Ni‐based superalloys are materials of choice for harsh high‐temperature environments of aircraft engines and gas turbines. Their compositional complexity requires sophisticated thermo‐mechanical processing. A typical microstructure consists of a polycrystalline γ‐matrix, strengthening Ni₃(Al,Ti) γ′ precipitates, carbides (MC, M₆C, and M₂₃C₆), borides (M₂B, M₃B₂, and M₅B₃), and other...

article

Temperature sensitivity maps of silicon wafers from photoluminescence imaging: The effect of gettering and hydrogenation

Shuai Nie, Robert Lee Chin, Arman Mahboubi Soufiani, Torbjørn Mehl, more

Progress in Photovoltaics: Research and Applications > 30 > 11 > 1298 - 1311

The operating temperature has a critical impact on the electrical performance of solar cells. It has been shown that the temperature coefficient is not uniform across devices and often varies between different regions due to the inhomogeneous distributions of defects. In this study, temperature‐dependent photoluminescence imaging measurements are used to assess the influence of different processes...

article

Advanced Thermo-mechanical Process for Homogenous Hierarchical Microstructures in HSLA Steels

Carina Ledermueller, Ernst Kozeschnik, Richard F. Webster, Sophie Primig

Metallurgical and Materials Transactions A > 2019 > 50 > 12 > 5800-5815

Engineering microstructures in high-strength low-alloy steels via advanced thermo-mechanical processing is a promising approach to overcome challenges around low work hardenability and toughness in ultrafine-grained mild steels. Recently, multiscale-hierarchical microstructures with ultrafine grains and two populations of precipitates decorating high-angle grain boundaries and dislocation structures...

article

Engineering Hierarchical Microstructures via Advanced Thermo-Mechanical Processing of a Modern HSLA Steel

Carina Ledermueller, Huijun Li, Sophie Primig

Metallurgical and Materials Transactions A > 2018 > 49 > 12 > 6337-6350

Advanced thermo-mechanical processing of mild steels in the ferrite phase field has recently achieved breakthrough in grain refinement into the submicron regime. However, these steels often suffer from grain boundary failure and low rates of work hardening. A potential approach to overcome these challenges is to process modern high-strength low-alloy steels with multi-scale hierarchical microstructures...

article

Precipitation in simultaneously nitrided and aged Mo-containing maraging steel

An Verdiere, Christina Hofer, Sam De Waele, Vitaliy Bliznuk, more

Materials Characterization > 2017 > 131 > C > 21-30

The excellent mechanical properties of maraging steels are ascribed to nanometer-sized intermetallics which precipitate during aging in the ductile very low carbon Ni-martensite. Their wear and fatigue properties can be improved by nitriding. The non-equilibrium precipitation reactions in Fe-Ni-Co-Mo maraging steels are studied during an aging heat treatment executed in a nitriding atmosphere. The...

article

Cold pilgering of duplex steel tubes: The response of austenite and ferrite to excessive cold deformation up to high strains

Katharina S. Ragger, Sophie Primig, Rostislav Daniel, Robert Kaiser, more

Materials Characterization > 2017 > 128 > C > 257-268

Duplex stainless steels are not easily formable due to the different deformation behaviour of austenite and ferrite. The seamless tube making process cold pilgering provides deformation conditions that enable enormous plastic strains at room temperature. The favourable stress state makes axial elongations of 400 to 600% at cross-sectional reductions of about 80% possible for hollows made of Super...

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Influence of Heat Treatment on Microstructure Stability and Mechanical Properties of a Carbide‐Free Bainitic Steel

Christina Hofer, Sophie Primig, Helmut Clemens, Florian Winkelhofer, more

Advanced Engineering Materials > 19 > 4 > n/a - n/a

Carbide‐free bainitic steels represent attractive candidates for the automotive industry to meet the conflicting requirements of increasing safety and decreasing vehicle weight. Their fine‐grained multi‐phase microstructure enables a well‐balanced combination of high strength and ductility. To identify and characterize all phases in dependence of the isothermal transformation temperature, metallographic...

article

Morphology change of retained austenite during austempering of carbide-free bainitic steel

Christina Hofer, Florian Winkelhofer, Helmut Clemens, Sophie Primig

Materials Science and Engineering: A > 2016 > 664 > C > 236-246

A change in the mechanical properties of a carbide-free bainitic steel was observed during prolonged holding at austempering temperature after termination of the bainitic transformation. To determine the origin of the property change, the microstructure was investigated by correlative electron microscopy. Although the retained austenite content remains the same during prolonged holding, its morphology...

article

Correlative microscopy of a carbide-free bainitic steel

Christina Hofer, Vitaliy Bliznuk, An Verdiere, Roumen Petrov, more

Micron > 2016 > 81 > C > 1-7

In this work a carbide-free bainitic steel was examined by a novel correlative microscopy approach using transmission Kikuchi diffraction (TKD) and transmission electron microscopy (TEM). The individual microstructural constituents could be identified by TKD based on their different crystal structure for bainitic ferrite and retained austenite and by image quality for the martensite–austenite (M–A)...

article

Induction Tempering vs Conventional Tempering of a Heat-Treatable Steel

Stephanie Sackl, Michael Zuber, Helmut Clemens, Sophie Primig

Metallurgical and Materials Transactions A > 2016 > 47 > 7 > 3694-3702

An induction heat treatment is favorable compared to a conventional one mainly due to significant time and cost savings. Therefore, in this study, the microstructure property relationships during induction and conventional heat treatment of a heat treatable steel 42CrMo4 is investigated. The yield strength and hardness is slightly higher for the conventionally heat-treated steel, whereas the induction...

article

Structural characterization of “carbide-free” bainite in a Fe–0.2C–1.5Si–2.5Mn steel

Christina Hofer, Harald Leitner, Florian Winkelhofer, Helmut Clemens, more

Materials Characterization > 2015 > 102 > Complete > 85-91

Low-alloyed, low C containing carbide-free bainitic steels are attractive candidates for applications in the automotive industry due to their well-balanced combination of high strength and ductility achieved in an economic way. In this work, their complex microstructure consisting of a mixture of bainitic ferrite, austenite with different morphologies and stabilities, martensite, M/A constituent and...

article

Texture Evolution during Deformation of a Mo-Hf-C Alloy Studied with Electron Backscatter Diffraction

David Lang, Jürgen Schatte, Wolfram Knabl, Helmut Clemens, more

BHM Berg- und Hüttenmännische Monatshefte > 2015 > 160 > 5 > 226-230

The powder metallurgically produced alloy MHC (Mo-Hf-C) has excellent properties at elevated temperatures, e.g. high strength, and has a high recrystallization temperature. In order to study the recrystallization behavior of MHC, a detailed knowledge of the texture evolution during deformation is important. Therefore, samples were deformed with a deformation dilatometer at different temperatures,...

article

Boron Grain Boundary Segregation in a Heat Treatable Steel

Phillip Haslberger, Christoph Turk, Katharina Babinsky, Devrim Caliskanoglu, more

BHM Berg- und Hüttenmännische Monatshefte > 2015 > 160 > 5 > 204-208

By applying a heat treatment, such as hardening and tempering, the properties of a heat treatable steel, like 42CrMo4, can be adjusted over a wide range. In addition to the heat treatment, an appropriate alloying concept is crucial to be able to guarantee an outstanding performance over a large variety of applications. In the present study, the effects of boron as a microalloying element on a heat...

article

Advanced Structure-Property Relationships: Made in Styria!

Sophie Primig

BHM Berg- und Hüttenmännische Monatshefte > 2015 > 160 > 5 > 203-203

article

Induction Hardening vs Conventional Hardening of a Heat Treatable Steel

Stephanie Sackl, Harald Leitner, Michael Zuber, Helmut Clemens, more

Metallurgical and Materials Transactions A > 2014 > 45 > 12 > 5657-5666

This study focuses on the comparison of mechanical and microstructural properties of induction and conventionally heat-treated steels in the as-quenched state. The investigated steel is a heat treatable 42CrMo4 steel. In order to characterize the mechanical properties, tensile tests and Vickers hardness tests are performed. The yield strength and hardness of the induction hardened condition turn out...

article

Einfluss der Mikrolegierung (Nb, Al, N) auf die Feinkornbeständigkeit von Einsatzstählen vom Typ 18CrNiMo7−6

Heike Zacharias, Johannes Arndt, Sophie Primig

BHM Berg- und Hüttenmännische Monatshefte > 2014 > 159 > 7 > 296-297

Der Einsatzstahl 18CrNiMo7 − 6 wird als Werkstoff für große Getriebebauteile von Windkrafträdern verwendet, welche wegen der Anforderungen an den Werkstoff bei 980 °C für bis zu 80 h einsatzgehärtet werden. Das dabei einsetzende Kornwachstum soll mithilfe von Ausscheidungen durch Mikrolegierungselemente wie Aluminium und Niob reduziert werden. Bei dieser Diplomarbeit wurden das Ausscheidungsverhalten...

article

Early Stages of Precipitation: Experiments and Modelling

Sophie Primig, Harald Leitner, Ernst Kozeschnik

BHM Berg- und Hüttenmännische Monatshefte > 2014 > 159 > 1 > 5-11

Precipitation hardening of structural high-performance materials is considered as one of the most important strengthening mechanisms. In alloys containing precipitate forming elements, a fine dispersion of nanometer-sized particles precipitates from a supersaturated solid-solution. The size, volume fraction, and number density of these precipitates can be controlled by elaborate thermo-mechanical...

article

Influence of Deformation on the Precipitation Behavior of Nb(CN) in Austenite and Ferrite

Matthias Nöhrer, Walter Mayer, Sophie Primig, Sabine Zamberger, more

Metallurgical and Materials Transactions A > 2014 > 45 > 10 > 4210-4219

The evolution of Nb precipitates in a low-alloyed steel at 973 K (700 °C) as a function of strain and subsequent dwell time is studied via atom-probe tomography (APT) and transmission electron microscopy. The results show that the volume fraction of the precipitates increases with increasing accumulated deformation because deformation-induced dislocations act as nucleation sites. The chemistry of...

article

The Effect of Zr Incorporation Caused by Ball Abrasion in a Milled Fe-Y₂O₃ Model Alloy

Gerald Ressel, Sophie Primig, Harald Leitner

Metallurgical and Materials Transactions A > 2014 > 45 > 3 > 1552-1558

Y-O nanoparticles which are homogeneously distributed in the matrix can improve the thermal properties of steels. Several studies of mechanically alloyed steels showed that especially Y-Ti-O particles can cause a further improvement of the mechanical properties at elevated temperatures. It is also assumed that an addition of Zr instead of Ti may have a similar or even stronger effect. This study presents...

article

Textural Evolution During Dynamic Recovery and Static Recrystallization of Molybdenum

Sophie Primig, Harald Leitner, Wolfram Knabl, Alexander Lorich, more

Metallurgical and Materials Transactions A > 2012 > 43 > 12 > 4794-4805

In the current investigation, sintered molybdenum specimens with random textures were deformed in compression in a deformation dilatometer over a range of temperatures from 0.44T _M [K] to 0.61T _M [K] and true strains between φ = 0.3 and 0.92. Subsequent annealing treatments were carried out in the dilatometer in order to study static recrystallization phenomena. Electron backscatter diffraction scans...

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INFONA - science communication portal

Search results for: Sophie Primig

Review of Microstructure–Mechanical Property Relationships in Cast and Wrought Ni‐Based Superalloys with Boron, Carbon, and Zirconium Microalloying Additions

Temperature sensitivity maps of silicon wafers from photoluminescence imaging: The effect of gettering and hydrogenation

Advanced Thermo-mechanical Process for Homogenous Hierarchical Microstructures in HSLA Steels

Engineering Hierarchical Microstructures via Advanced Thermo-Mechanical Processing of a Modern HSLA Steel

Precipitation in simultaneously nitrided and aged Mo-containing maraging steel

Cold pilgering of duplex steel tubes: The response of austenite and ferrite to excessive cold deformation up to high strains

Influence of Heat Treatment on Microstructure Stability and Mechanical Properties of a Carbide‐Free Bainitic Steel

Morphology change of retained austenite during austempering of carbide-free bainitic steel

Correlative microscopy of a carbide-free bainitic steel

Induction Tempering vs Conventional Tempering of a Heat-Treatable Steel

Structural characterization of “carbide-free” bainite in a Fe–0.2C–1.5Si–2.5Mn steel

Texture Evolution during Deformation of a Mo-Hf-C Alloy Studied with Electron Backscatter Diffraction

Boron Grain Boundary Segregation in a Heat Treatable Steel

Advanced Structure-Property Relationships: Made in Styria!

Induction Hardening vs Conventional Hardening of a Heat Treatable Steel

Einfluss der Mikrolegierung (Nb, Al, N) auf die Feinkornbeständigkeit von Einsatzstählen vom Typ 18CrNiMo7−6

Early Stages of Precipitation: Experiments and Modelling

Influence of Deformation on the Precipitation Behavior of Nb(CN) in Austenite and Ferrite

The Effect of Zr Incorporation Caused by Ball Abrasion in a Milled Fe-Y₂O₃ Model Alloy

Textural Evolution During Dynamic Recovery and Static Recrystallization of Molybdenum

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