Masoud Rashidi

Doktor at Chalmers, Industrial and Materials Science, Materials and manufacture

Laser sintering (LS) is the dominant powder-based method for additive manufacturing (AM) of metallic components that is already found in industrial application for high performance components. Masoud Rashidi’s current research focuses on powder characteristics and metallurgical principles for materials being processed by AM. To do this the microstructure of the additively manufactured components from Ni-base superalloys (e.g. IN625, IN718, and IN738) and stainless steels (e.g. grade 316) are characterized using X-ray Photoelectron Spectroscopy (XPS), Auger Electron Spectroscopy (AES), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and Atom Probe Tomography (APT). The aim of the project is to develop methodology for rapid development of the Ni-based alloys with tailored properties for specific applications, produced by LS.Masoud Rashidi was awarded PhD in Materials Science and Engineering at Chalmers University of Technology in 2017. The PhD aimed at developing a new generation of creep resistant 9–12%Cr steels for applications in critical components of thermal power plants. The research was done a close collaboration between Chalmers Technical University, Siemens Industrial Turbomachinery and Technical University of Denmark and the partners of the Z-Ultra consortium: Saarschmiede GmbH, Fraunhofer Institute of Mechanics of Materials, RWE power AG, Paton Electric Welding Institute, Technical University of Graz, Engineering Academy of Armenia, Georgian Technical University, IPP center LLC, and the Institute of Physics of Materials of the Academy of Sciences of Czech Republic. The study aimed at evaluating the feasibility of using precipitates of a thermodynamically stable phase, Z-phase (CrTaN), as strengthening agent to achieve proper creep strength at steam temperature of 650°C. Masoud Rashidi contributed to the development of more than 10 trial steels mainly by investigating the microstructure using SEM, TEM, and APT.Masoud Rashidi got his MSc degree in Materials Science and Engineering from KTH-Royal Institute of Technology in 2013. His master thesis project was done in a collaboration between Linköping University, Sapa Technology and TitanX Engines cooling. The goal of the research was to investigate the role of heat treatment on the microstructure and mechanical properties of Al-Mg-Si alloys.

Source: chalmers.se

Publications

2017

Core-Shell Structure of Intermediate Precipitates in a Nb-Based Z-Phase Strengthened 12% Cr Steel

Masoud Rashidi, Hans-Olof Andrén, Fang Liu
Microscopy and Microanalysis. Vol. 23 (2), p. 360-365
Journal article
2017

Atom probe study of MX to Z-phase transformation in Z-phase strengthened 12%Cr steels

Masoud Rashidi, Hans-Olof Andrén, Fang Liu
Microscopy and Microanalysis. Vol. 23, p. 360-365
Journal article
2017

Microstructure and mechanical properties of two Z-phase strengthened 12%Cr martensitic steels: the effects of Cu and C

Masoud Rashidi, Lars-Gunnar Johansson, Hans-Olof Andrén et al
Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing. Vol. 694, p. 57-65
Journal article
2017

Microstructure of Z-Phase Strengthened Martensitic Steels: Meeting the 650°C Challenge

Fang Liu, Masoud Rashidi, John Hald et al
Materials Science Forum. Vol. 879, p. 1147-1152
Journal article
2016

A new 12% chromium steel strengthened by Z-phase precipitates

Fang Liu, Masoud Rashidi, Lars-Gunnar Johansson et al
Scripta Materialia. Vol. 113, p. 93-96
Journal article
2016

Initial study of the microstructure of carbon fibres acting as negative electrodes in structural battery composites

Fang Liu, Masoud Rashidi, Leif Asp
Procedings of 17th European Conference on Composite Materials, ECCM17
Paper in proceedings
2016

Tantalum and niobium based Z-phase in a Z-phase strengthened 12% Cr steel

Masoud Rashidi, ROBERT LAWITZKI, Hans-Olof Andrén et al
Advances in Materials Technology for Fossil Power Plants - Proceedings from the 8th International Conference on Advances in Materials Technology for Fossil Power Plants; Albufeira, Portugal; 11-14 October 2016, p. 1058-1066
Paper in proceedings
2014

Microstructure characterization of two Z-phase strengthened 12%chromium steels

Masoud Rashidi, Fang Liu, Hans-Olof Andrén
10th Liège Conference on Materials for Advanced Power Engineering. September 14th - 17th, 2014.
Paper in proceedings
2013

Microstructural characterization and formation of alpha ' martensite phase in Ti-6Al-4V alloy butt joints produced by friction stir and gas tungsten arc welding processes

Mohsen Esmaily, Nooshin Mortazavi Seyedeh, P. Todehfalah et al
Materials & Design. Vol. 47, p. 143-150
Journal article

Projects

2016–2018

Nickel-based material for additive manufacturing

Eduard Hryha Surface and Microstructure Engineering
Masoud Rashidi Materials and manufacture
VINNOVA

2015–2018

Powder and materials design for flexible high-quality additive manufacturing

Lars Nyborg Materials and manufacture
Masoud Rashidi Materials and manufacture
VINNOVA

2014–2018

Design of a new generation of 12% chromium steels

Fang Liu Materials Microstructure
Hans-Olof Andrén Materials Microstructure
Masoud Rashidi Materials Microstructure
VGB Research Foundation
Swedish Energy Agency

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