CMatP Seminar & Networking Event
Source: Hong Lu, Alan Hellier, Sophie Primig, Andrii Kostryzhev, Klaus-Dieter Liss
In November 2016, two recently-awarded CMatPs presented at a seminar for the Materials Australia New South Wales (NSW) Branch. The seminar was held in the Chemical Sciences Building of the University of New South Wales (UNSW Australia), followed by afternoon tea and lab visits hosted by the School of Materials Science and Engineering. This networking event was open to Materials Australia members only, with a number of people attending from industry, government organisations, and universities.
Figure 1: Attendees L to R: Dr. Andrii Kostryzhev, Dr. Sophie Primig, Dr. Hong Lu, Prof. Jay Kruzic, Mr. Dashty Akrawi, Mr. Nima Karkhaneh, Prof. Klaus-Dieter Liss, Mr. Carl Strautins, Mr. Cameron Chai, Dr. Phillip Carter, Mr. Ian Hall.
Figure 2: Dr. Sophie Primig receiving her CMatP certificate (L) from NSW Branch Secretary Dr. Hong Lu (R).
Sophie is an early-career researcher with key strengths in physical metallurgy and materials characterisation, and aims to develop a conceptual bridge in terms of structure-property relationships across the processing route of structural metallic materials. Experimentally, she applies and extends techniques such as atom probe and electron microscopy to enable observations over several imaging scales. Her focus on steels, molybdenum alloys and nickel-based alloys has been closely linked to the needs of industrial partners. Figure 3 shows an overview of a current industrially-sponsored project on thermo-mechanical processing of nickel-based alloys for turbine disc applications. The Austrian company partners have devised a novel thermo-mechanical treatment in order to increase the efficiency of modern passenger aircraft engines. This process is shorter than the conventional one, but yields better mechanical properties. However, the detailed microstructural evolution during this novel thermo-mechanical treatment is unknown, and thus, the metallurgical reason for the property improvement not understood. Therefore, in this project, Sophie’s PhD student carefully studies the microstructures of industrially-processed turbine discs via several length scales, employing techniques such as electron back-scatter diffraction, scanning and transmission electron microscopy, and atom probe microscopy. These results feed back into processing and finite element modelling carried out at the industrial partner, in order to devise the best processing route for future aircraft engines.
Figure 3: Overview of a current industrially-sponsored project on forging of nickel-based alloys for turbine disc applications. The materials characterisation part is carried out at UNSW Australia, Sydney; industrial forging and finite element modelling is done at the industrial partner.
The second speaker was Dr. Andrii Kostryzhev (Figure 4) from the School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong. He began his presentation with the story of how he started his professional career. After being awarded an MSc in 1998 and a PhD in 2002 from the National Metallurgical Academy of Ukraine (city of Dnepropetrovsk), he served as an Assistant and then a Lecturer in Engineering Mechanics at the same University during 2001-2005. He then joined the School of Metallurgy and Materials, University of Birmingham, UK, in its post-graduate research program and obtained his PhD in 2009. After that he worked as a Research Fellow at the Birmingham Centre for Railway Research and Education at the same University. Since 2011 he has been a Research Fellow, actively lecturing on the subject of “Metallic materials: Ferrous alloys” at the University of Wollongong.
Andrii moved on to various research areas. He worked on a number of University-Industry collaborative R&D projects covering the following areas: seamless tube and welded pipe manufacturing, plate and strip manufacturing, phase transformations and thermomechanical processing of steels, microstructure characterisation using optical and electron microscopy (scanning and transmission), chemical analysis using energy dispersive X-ray spectroscopy, mechanical testing (tensile, impact, fatigue, wear), fracture, and acoustic emission monitoring.
Figure 4: Dr Andrii Kostryzhev awarded his CMatP certificate (L) by NSW Branch Secretary Dr. Hong Lu (R).
Andrii’s presentation on 16th November, entitled “Processing - Microstructure - Properties of Steels” covered some publicly-available research and technology development results from various periods of his 18-year career. Effects of steel composition and processing history on the microstructure-property relationships were discussed. Using examples from recently-published research on Ti, Nb, V microalloyed steels and Nb-rich Ni-based model alloys, he highlighted the importance of complex investigation of material microstructure, in order to understand the contributions of various strengthening mechanisms in steels and other metallic materials. Quite often the property levels expected from the additions of microalloying elements are significantly overestimated, compared to the real values. This may result from incorrect choice of processing strategy. Attempts to gain a contribution from one microstructure development mechanism (grain refinement or phase transformation, for instance) should not compromise a possible contribution from another one (formation of dislocation sub-structure or particle precipitation). In Figure 5, an NbTi-microalloyed dual phase steel continuously-cooled at a slow rate through the austenite+ferrite temperature region, showed maximum strength for the intermediate solidification rate of 30 Ks-1. This solidification rate resulted in about a 50/50 phase balance, and simultaneously minima of bainite grain size and plate width, and maxima of the <15 nm particles number density and dislocation density in the bainite [Scientific Reports, 6, article 35715; doi: 10.1038/srep35715 (2016)].
Figure 5: (a-c) Optical and (d-f) Transmission electron micrographs with corresponding hardness values for an NbTi-microalloyed dual phase steel solidified at the rates of (a, d) 1, (b, e) 30 and (c, f) 50 Ks-1.
At the end of the seminar, Prof. Klaus-Dieter Liss explained the concept of CMatP (Certified Materials Professional) and the application process, which is scrutinised and awarded by the National CMatP Committee. Materials Australia NSW Branch Secretary Dr. Hong Lu awarded new certificates to the two speakers.
After the seminar, we moved to the School of Materials Science and Engineering, UNSW Australia for a lab tour and networking tea. We visited specific metals-processing related labs (physical metallurgy, Gleeble physical thermo-mechanical simulator, metal 3D printing, metallography). The recently constructed new School building is a state-of-the-art purpose-built facility. During the networking tea, we had an opportunity to share our thoughts and suggestions for future branch events and reports.