Wolfgang Bleck
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View article: Near‐Atomic Scale Characterization of Mn‐Gradient in Reverted Austenite in Hot‐Rolled Medium‐Mn Steels
Near‐Atomic Scale Characterization of Mn‐Gradient in Reverted Austenite in Hot‐Rolled Medium‐Mn Steels Open
Herein, the Fe–5Mn–2Al–0.1C (wt%) and micro‐alloyed Fe–5Mn–2Al–0.1C–0.1Nb–0.2V (wt%) medium Mn steels are processed by a novel flash‐austenite‐reverse‐transformation (ART) annealing. The core–shell Mn‐gradient in austenite is observed and …
View article: Laves Phase Precipitation Behavior in HiperFer (High Performance Ferritic) Steel with and without Boron Alloying
Laves Phase Precipitation Behavior in HiperFer (High Performance Ferritic) Steel with and without Boron Alloying Open
High-chromium ferritic stainless HiperFer steels were developed for high-temperature applications in power conversion equipment. The presented research describes the precipitation behavior of the Laves phase after the thermomechanical trea…
View article: Alloying and Processing of Medium Manganese Steels for Forging Applications
Alloying and Processing of Medium Manganese Steels for Forging Applications Open
The processability of medium Mn-containing steels (MMnS) with 4–10% Mn is discussed in light of their continuous casting behavior. Precipitation, phase transformation, extension, or shift of solidification intervals induced by various allo…
View article: Kinetic Model of Isothermal Bainitic Transformation of Low Carbon Steels under Ausforming Conditions
Kinetic Model of Isothermal Bainitic Transformation of Low Carbon Steels under Ausforming Conditions Open
Carbide-free bainitic steels show attractive mechanical properties but are difficult to process because of the sluggish phase transformation kinetics. A macroscopic model based on the classical nucleation theory in conjunction with the mod…
View article: Dynamic and Static Strain Aging in a High‐Manganese Steel
Dynamic and Static Strain Aging in a High‐Manganese Steel Open
Carbon‐containing high‐manganese steels are susceptible to strain aging, which influences the mechanical properties during and after deformation. To understand the strain aging behavior of austenitic Fe‐22Mn‐1.3Al‐0.3C high‐manganese steel…
View article: Tailoring the Austenite Fraction of a Cu and Ni Containing Medium-Mn Steel via Warm Rolling
Tailoring the Austenite Fraction of a Cu and Ni Containing Medium-Mn Steel via Warm Rolling Open
Developing medium-Mn steels (MMnS) demands a better understanding of the microstructure evolution during thermo-mechanical treatments (TMTs). This study demonstrates the relationship among processing, microstructure, and mechanical propert…
View article: Mechanism-controlled thermomechanical treatment of high manganese steels
Mechanism-controlled thermomechanical treatment of high manganese steels Open
Austenitic high manganese steels exhibit outstanding mechanical properties, such as high energy absorption, owing to various deformation-mechanisms such as dislocation slip, twinning-induced plasticity (TWIP) and transformation-induced pla…
View article: The continuous casting behavior of medium manganese steels
The continuous casting behavior of medium manganese steels Open
The continuous casting behavior of medium manganese steels (MMnS: 6Mn, 6Mn–1Si, 6Mn–1Si–1Al, 10Mn–1Si and 10Mn–1Si–1Al) have been investigated and compared with unalloyed carbon steel C30. A series of in-situ melting/re-solidification hot …
View article: Tempering and Intercritical Annealing of Air‐Hardening 4 wt% Medium Manganese Steels
Tempering and Intercritical Annealing of Air‐Hardening 4 wt% Medium Manganese Steels Open
The mechanical properties after tempering and intercritical annealing of medium manganese steels with 4 wt% Mn for forging applications are presented. After forging with subsequent air cooling, heat treatments were performed, specifically …
View article: Multiphase-field simulation of austenite reversion in medium-Mn steels
Multiphase-field simulation of austenite reversion in medium-Mn steels Open
Medium-Mn steels have attracted immense attention for automotive applications owing to their outstanding combination of high strength and superior ductility. This steel class is generally characterized by an ultrafine-grained duplex micros…
View article: Hydrogen effect on the mechanical behaviour and microstructural features of a Fe-Mn-C twinning induced plasticity steel
Hydrogen effect on the mechanical behaviour and microstructural features of a Fe-Mn-C twinning induced plasticity steel Open
The influences of hydrogen on the mechanical properties and the fracture behaviour of Fe-22Mn-0.6C twinning induced plasticity steel have been investigated by slow strain rate tests and fractographic analysis. The steel showed high suscept…
View article: New insights into the properties of high-manganese steel
New insights into the properties of high-manganese steel Open
In the Collaborative Research Centre 761’s “Steel ab initio - quantum mechanics guided design of new Fe based materials,” scientists and engineers from RWTH Aachen University and the Max Planck Institute for Iron Research conducted researc…
View article: Development and identification of the cellular automata phase transformation model
Development and identification of the cellular automata phase transformation model Open
The development and identification of the complex microscale austenite to ferrite transformation model during continuous cooling based on the Cellular Automata method and DigiCore library is the main goal of the work. The model is designed…
View article: Modeling of the microstructural effects on the mechanical response of polycrystals
Modeling of the microstructural effects on the mechanical response of polycrystals Open
The modeling and hence exploitation of the connection between the microstructure and the mechanical response of polycrystals is and continues to be at the forefront of the longstanding challenges in the materials science and metallurgical …
View article: Influence of Microalloying on the Surface Layer of a Carbonitrided Steel 18CrNiMo7-6
Influence of Microalloying on the Surface Layer of a Carbonitrided Steel 18CrNiMo7-6 Open
To further enhance the performance of case hardening steels, the surface layer is thermochemically treated. By carbonitriding, a thermochemical process by which carbon as well as nitrogen are brought into the surface layer, the tooth flank…
View article: Effect of molybdenum, aluminium and boron on the phase transformation in 4 wt.–% manganese steels
Effect of molybdenum, aluminium and boron on the phase transformation in 4 wt.–% manganese steels Open
The transformation behavior of medium manganese steels after forging has been characterized using dilatometry in order to investigate the influence of the alloying elements. The alloys contain 4 wt.–% manganese, 0.5 wt.–% silicon, 0.035 …
View article: Effect of ausforming on microstructure and hardness characteristics of bainitic steel
Effect of ausforming on microstructure and hardness characteristics of bainitic steel Open
Effects of process parameters of the ausforming such as temperature, strain and strain rate on the martensitic start temperature, kinetics of isothermal bainitic transformation and microstructure refinement of a low carbon carbide-free bai…
View article: Methods to Classify Bainite in Wire Rod Steel
Methods to Classify Bainite in Wire Rod Steel Open
The microstructural description in bainitic steel is commonly ambiguous, and the interpretations of results that originate from applied methods are usually user dependent. In consequence, a manifold description of bainite makes it difficul…
View article: Compositional Optimization of High-Performance Ferritic (HiperFer) Steels—Effect of Niobium and Tungsten Content
Compositional Optimization of High-Performance Ferritic (HiperFer) Steels—Effect of Niobium and Tungsten Content Open
The combined addition of Nb and W provides increased solid solution and precipitation strengthening by (Fe,Cr,Si)2(Nb,W)-Laves phase particles of ferritic, 17 wt.% Cr stainless high-performance ferritic (HiperFer) steel. Based on alloy mod…
View article: Thermomechanically Induced Precipitation in High-Performance Ferritic (HiperFer) Stainless Steels
Thermomechanically Induced Precipitation in High-Performance Ferritic (HiperFer) Stainless Steels Open
Novel high-performance fully ferritic (HiperFer) stainless steels were developed to meet the demands of next-generation thermal power-conversion equipment and to feature a uniquely balanced combination of resistance to fatigue, creep, and …
View article: Impact of Tungsten on Thermomechanically Induced Precipitation of Laves Phase in High Performance Ferritic (HiperFer) Stainless Steels
Impact of Tungsten on Thermomechanically Induced Precipitation of Laves Phase in High Performance Ferritic (HiperFer) Stainless Steels Open
High-chromium ferritic stainless steels strengthened by Laves phase precipitates were developed for a high-temperature application in steam power plants. The impact of tungsten content on the precipitation of the intermetallic Laves phase …
View article: Hydrogen Embrittlement Susceptibility of Gas Metal Arc Welded Joints from a High‐Strength Low‐Alloy Steel Grade S690QL
Hydrogen Embrittlement Susceptibility of Gas Metal Arc Welded Joints from a High‐Strength Low‐Alloy Steel Grade S690QL Open
Herein, the hydrogen embrittlement (HE) susceptibility of base material and gas metal arc welds from a high‐strength low‐alloy steel grade S690QL by slow strain rate test (SSRT) with in situ hydrogen charging is investigated. To investigat…
View article: Effect of Molybdenum and Cooling Regime on Microstructural Heterogeneity in Bainitic Steel Wires
Effect of Molybdenum and Cooling Regime on Microstructural Heterogeneity in Bainitic Steel Wires Open
Hot‐rolled wire is often further processed into complex components and therefore has to meet high demands on mechanical properties. Above all, during wire production, close control of the cooling parameters after hot rolling is required if…
View article: Alloy- and process design of additively manufactured bulk and lattice structures of austenitic advanced high-strength steels
Alloy- and process design of additively manufactured bulk and lattice structures of austenitic advanced high-strength steels Open
Laser powder bed fusion (LPBF), with its potential to overcome design deficiencies of conventional manufacturing processes and to print highly complex parts such as lattice structures with unique properties, is one of the key technologies …
View article: Toughness of cold formable steel sheet
Toughness of cold formable steel sheet Open
In the past, the toughness of high-strength sheet materials with product thicknesses below 2.5 mm has only been insufficiently investigated. In this thesis, therefore, an experimental technique is developed to determine the toughness of th…