Heiner Meyer
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View article: Microstructural and chemical surface and rim zone changes of ferrite‐perlite 42CrMo4 steel after electrochemical machining
Microstructural and chemical surface and rim zone changes of ferrite‐perlite 42CrMo4 steel after electrochemical machining Open
Electrochemical machining is based on the anodic dissolution of most metals and generates high quality polished surfaces. However, ferrite‐perlite 42CrMo4 steel reveals local optical changes at the surface after electrochemical finishing, …
View article: The Influence of Former Process Steps on Changes in Hardness, Lattice and Micro Structure of AISI 4140 Due to Manufacturing Processes
The Influence of Former Process Steps on Changes in Hardness, Lattice and Micro Structure of AISI 4140 Due to Manufacturing Processes Open
The surface and subsurface conditions of components are critical for their functional properties. Every manufacturing process modifies the surface condition as a consequence of its mechanical, chemical, and thermal impact or combinations o…
View article: Revealing the Dynamic Transformation of Austenite to Bainite during Uniaxial Warm Compression through In-Situ Synchrotron X-ray Diffraction
Revealing the Dynamic Transformation of Austenite to Bainite during Uniaxial Warm Compression through In-Situ Synchrotron X-ray Diffraction Open
In this work, the microstructural evolution during the dynamic transformation of austenite to bainite was directly observed by in-situ high energy synchrotron X-ray diffraction measurements during warm uniaxial compression performed at the…
View article: Comparison of Different Manufacturing Processes of AISI 4140 Steel with Regard to Surface Modification and Its Influencing Depth
Comparison of Different Manufacturing Processes of AISI 4140 Steel with Regard to Surface Modification and Its Influencing Depth Open
The surface and subsurface conditions of components are significant for their functional properties. Every manufacturing process step changes the surface condition due to its mechanical, chemical and/or thermal impact. The depth of the aff…
View article: Spatial Internal Material Load and Residual Stress Distribution Evolution in Synchrotron In Situ Investigations of Deep Rolling
Spatial Internal Material Load and Residual Stress Distribution Evolution in Synchrotron In Situ Investigations of Deep Rolling Open
Mechanical loading scenarios, comparable to a deep rolling process, were reproduced in static indentation experiments on AISI 4140H steel samples with a cylindrical deep rolling tool and investigated in situ with synchrotron radiation at t…
View article: Multi-cycle phase transformation during laser hardening of AISI 4140
Multi-cycle phase transformation during laser hardening of AISI 4140 Open
Laser hardening is a process that modifies not only hardness, but also residual stresses near the surface. However, limited information is available on the effect of multi-cycle phase transformation on the hardness and residual stresses, w…
View article: Experimental Investigation concerning the Influence of Electrochemical Machining on Process Chain induced Residual Stress States
Experimental Investigation concerning the Influence of Electrochemical Machining on Process Chain induced Residual Stress States Open
Within technical systems, the durability of each individual component is significantly determined by its surface integrity. Therefore, a powerful approach to increase the performance of each component is to deterministically set-up its rim…
View article: Development of surface residual stress and surface state of 42CrMo4 in multistage grinding
Development of surface residual stress and surface state of 42CrMo4 in multistage grinding Open
In this study, cylindrical grinding of a 42CrMo4 (AISI 4140) steel with varied grinding sequence stages is analyzed regarding the effect of the different loads during multistage grinding up to the resulting final residual stress state and …
View article: In Situ X-ray Diffraction Analysis of Stresses during Deep Rolling of Steel
In Situ X-ray Diffraction Analysis of Stresses during Deep Rolling of Steel Open
Residual stresses originating from elasto-plastic deformation during mechanical processing can be analyzed post-process with various known methods. A new measurement method to measure and evaluate the strain and stress fields in situ under…
View article: In-Situ Analysis of Material Modifications During Deep Rolling by Synchrotron X-Ray Diffraction Experiments
In-Situ Analysis of Material Modifications During Deep Rolling by Synchrotron X-Ray Diffraction Experiments Open
In-Situ Analysis of Material Modifications During Deep Rolling by Synchrotron X-Ray Diffraction Experiments H. Meyer, J. Epp Abstract. The stress state achieved through elasto-plastic deformation in the deep rolling process has been analyz…
View article: Residual stress and dislocation density development in single track deep rolled AISI 4140H steel
Residual stress and dislocation density development in single track deep rolled AISI 4140H steel Open
Plastic deformations induced by the rolling contact in the deep rolling process are the origin of the formation of residual stress fields and increased dislocation density in the material. The near surface material modification achieved th…
View article: Influence of pre-machining on the surface integrity after processing by mechanical surface treatment
Influence of pre-machining on the surface integrity after processing by mechanical surface treatment Open
The functional performance of workpieces is strongly influenced by the surface and subsurface properties which are affected and can be adjusted by manufacturing processes. The finishing process determines the final form and the surface rou…
View article: In situ X-Ray Diffraction Investigation of Surface Modifications in a Deep Rolling Process under Static Condition
In situ X-Ray Diffraction Investigation of Surface Modifications in a Deep Rolling Process under Static Condition Open
In situ X-Ray Diffraction Investigation of Surface Modifications in a Deep Rolling Process under Static Condition H. Meyer, J. Epp, H.W. Zoch Abstract. The deep rolling process is widely used as a finishing step, improving the surface prop…
View article: Investigations on Surface Integrity of Heat Treated 42CrMo4 (AISI 4140) Processed by Sinking EDM
Investigations on Surface Integrity of Heat Treated 42CrMo4 (AISI 4140) Processed by Sinking EDM Open
Adjusting a resulting surface integrity prior to a manufacturing process is a big challenge in production engineering. One approach to solve this challenge is the methodology of process signatures. To develop a comprehensive process signat…