Muhammad Umar- MS Mechanical Engineering
- Ph.D Student at Karlsruhe Institute of Technology
Muhammad Umar
- MS Mechanical Engineering
- Ph.D Student at Karlsruhe Institute of Technology
Researcher at Karlsruhe Institute of Technology (KIT), Karlsruhe.
About
14
Publications
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121
Citations
Introduction
I am currently working on the solidification cracking behavior investigation of different grades of steel using phase-field modelling framework. The software used for pre-processing, simulations and post processing are Pace3D and ParaView.
Current institution
Additional affiliations
January 2022 - present
May 2021 - present
Position
- Researcher
Description
- My role is to use the previous knowledge in the crystal plasticity simulations of crystalline materials and carry out the modelling and simulations using virtual and real microstructural information separately. Data from EBSD is to be used by various software techniques including Mtex on MATLAB and Dream.3D for simulation on DAMASK prior to data presentation and visualization on Paraview.
May 2019 - July 2019
Position
- Researcher
Description
- My role as a guest scientist has been to work on micromechanical modelling of medium carbon steels. I modeled steels based on the virtual Representative Volume Elements (RVEs) using Dream.3D for crystal plasticity based numerical simulations using Dusseldorf Material Simulation Kit (DAMASK). The outcome of this work has been very interesting and has provided the basis for continued work on micromechanical material investigation.
Education
October 2018 - July 2020
Field of study
- Mechanical Engineering
November 2010 - July 2014
Publications
Publications (14)
Engineering materials are polycrystalline in nature, consisting of numerous single crystals interconnected through a three-dimensional interfacial network known as grain boundaries. Often essential in defining the performance and durability of materials, grain boundaries attract considerable attention during alloy development. Initially, we employ...
Dendritic growth is a common phenomenon during the solidification of alloys, and it has a significant impact on the final microstructure and mechanical properties of the material. This research study investigates the solidification behaviour of quaternary X5CrNi18-10 alloys at thermochemical conditions similar to the laser beam welding (LBW) proces...
Spheroidized steel microstructure presents a remarkable combination of strength and ductility suitable for cold forming applications. As the commercial spheroidization process consumes a significant amount of time and energy, therefore, suitable degree of spheroidization for specific material must be established to get the desired mechanical proper...
This work investigates a ferrite matrix with multiple non-metallic inclusions to evaluate their influence on the global and local deformation and damage behavior of modified 16MnCrS5 steel. For this purpose, appropriate specimens are prepared and polished. The EBSD technique is used to record local phase and orientation data, then analyze and ident...
This study analyses the effect of martensite grain size and its volume fraction in dual-phase (DP) steel on (1) the formability limit, (2) average global behavior under different loading conditions, and (3) damage initiation. The virtual RVEs (Representative Volume Elements) were constructed using DREAM.3D software with a variation of microstructur...
Herein, micromechanical simulations for three different states of spheroidized steel (C45EC) are conducted under quasi‐static tensile loading based on the actual texture and crystallographic orientation from electron backscatter diffraction (EBSD) data. Data denoising is conducted with MTex (open‐source Toolbox with MATLAB) for cleaning up the EBSD...
This research uses EBSD data of two thermo-mechanically processed medium carbon (C45EC) steel samples to simulate micromechanical deformation and damage behavior. Two samples with 83% and 97% spheroidization degrees are subjected to virtual monotonic quasi-static tensile loading. The ferrite phase is assigned already reported elastic and plastic pa...
The influence of microstructural attributes of crystalline material on its overall mechanical properties is of vital importance to get desired plasticity of a component. Varying grain morphology and distribution of the multi-phase steels can pose plastic flow challenges during cold forming. The spheroidized medium carbon steels obtained by reformin...
In this research, the effect of 2D and 3D Representative Volume Element (RVE) on the ductile damage behavior in single-phase (only ferrite) and dual-phase (ferrite and martensite) steels is analyzed. Physical and fitting parameters of the constitutive model for bcc-ferrite and bcc-martensite phases are adapted from the already published work. Cryst...
Herein, micromechanical material deformation behavior of medium carbon steel—with varying cementite particle size and distribution—under monotonic tensile load is modeled. The statistical phase morphology data are collected from the microscopy images of 83% spheroidized C45EC steel. Virtual microstructures for nine different cases are constructed u...
Micro-mechanical material deformation behavior of medium carbon steel under monotonic tensile load is modeled. Crystal plasticity and continuum mechanics-based numerical simulation model i.e., DAMASK is used to simulate the material at a micro-scale. The input parameters for simulation are prepared in two different ways to show the validity of both...
In order to satisfy the rising energy demands of global consumption, a new cleaner and renewable power source needs to be explored, conceptualized, and developed. Solar energy is a free and clean energy resource which can be used to generate power without damage to humans or the local ecosystems. To efficiently capture this solar energy as a feasib...
Questions
Questions (4)
I am trying to thermodynamically model the quaternary system for SS304L Considering Fe-Cr-C-Ni configuration. I need to find out the equilibrium condition during solidification process depending upon the chemical potential of involved elements. It is difficult to visualize the combination of 4 ternary systems to yield one quaternary system for the equilibrium conditions. A Tetrahedron can be a key to the solution of this problem but I am unable to do this in "Thermocalc". My questions
1. Has anyone ever drawn a similar quaternary phase diagram?
2. What are the other possible solutions to see the equilibrium conditions of this system depending upon the common tangent to the Gibbs energy curves?
3. Utilizing the experimental CalPhaD database of this system how can I get the 1) equilibrium temperature during monotectic reaction at 0.02% carbon ( L --> L + Delta ferrite ), 2) equlibrium concentrations of Cr, C, and Ni?
I have been working on the virtual RVE generation using Dream.3D for crystal plasticity-based numerical simulation on DAMASK. I have successfully generated multi phase RVEs with varying grain size and distribution of precipitate phase on grain boundaries.
Now I want see the banding effect of cementite particles in ferrite matrix (as in spheroidized pearlitic steels). For that I want to make Virtual RVEs with varying band width embedded in the ferrite matrix at specific gap.
Any software technique to make these RVEs e.g., Dream.3D, Neper or any other help or clue will be most appreciated.
For micro mechanical simulation of medium carbon steel we need elastic and plastic phase parameters of both ferrite and cementite phase present in the material. I have elastic stiffness constant values for both the phase and plastic phase parameters for ferrite. Upon looking into literature I came to know that Plastic phase parameters for Cementite Phase are not commonly available. Therefore I am in the need of Plastic phase parameters for cementite.
Thanks in advance.
Is there anyone who can please guide me to make a virtual pearlite banded structure using Dream.3D.
