Ivan Zhirnov

Ivan Zhirnov
Karlstads Universitet · Department of Engineering and Physics

Ph.D.

About

25
Publications
12,809
Reads
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278
Citations
Additional affiliations
October 2020 - present
Karlstads Universitet
Position
  • PostDoc Position
May 2020 - September 2020
EvoCargo
Position
  • Engineer
July 2017 - September 2019
National Institute of Standards and Technology
Position
  • Researcher
Education
July 2013 - July 2016
Moscow State Technological University Stankin
Field of study
  • Information-measuring and operating systems (in engineering).
August 2012 - June 2013
École nationale d'ingénieurs de Saint-Étienne
Field of study
  • Thermographie infrarouge du procédé de frittage sélectif par laser
September 2007 - July 2013
Moscow State Technological University Stankin
Field of study
  • Metrology, standardization and certification.

Publications

Publications (25)
Article
Full-text available
This paper describes advances in measuring the characteristic spatial distribution of surface temperature and emissivity during laser-metal interaction under conditions relevant for laser powder bed fusion (LPBF) additive manufacturing processes. Detailed descriptions of the measurement process, results, and approaches to determining uncertainties...
Article
In conjunction with bare metal single laser track validation experiments, a computational framework is proposed to accelerate the design and development of new additive manufacturing (AM) specific alloys. Specifically, Additive Manufacturing-Computational Fluid Dynamics (AM-CFD) and Calculation of Phase Diagram (CALPHAD), were combined to predict l...
Article
Melt pool monitoring (MPM) is a technique used in laser powder bed fusion (LPBF) to extract features from in-situ sensor signals that correlate to defect formation or general part fabrication quality. Various melt pool phenomena have been shown to relate to measured transient absorption of the laser energy, which in turn, can be relatable to the me...
Article
Full-text available
The complex physical nature of the laser powder bed fusion (LPBF) process warrants use of multiphysics computational simulations to predict or design optimal operating parameters or resultant part qualities such as microstructure or defect concentration. Many of these simulations rely on tuning based on characteristics of the laser-induced melt poo...
Article
High-speed thermography is useful tool for researching the laser powder bed fusion process by providing thermal information in heat affected zone. However, it is not directly possible to ascertain the position of the laser spot with respect to the melt pool, which could provide key information regarding how laser energy is distributed and absorbed....
Article
Additive manufacturing (AM) combines all of the complexities of materials processing and manufacturing into a single process. The digital revolution made this combination possible, but the commercial viability of these technologies for critical parts may depend on digital process simulations to guide process development, product design, and part qu...
Article
Full-text available
Selective laser melting is the method for 3D printing from metals. A solid part is built from powder layer-by-layer. A continuum-wave laser beam scans every powder layer to fuse powder. The process is studied with a high-speed CCD camera at the frame rate of 104 fps and the resolution up to 5 µm per pixel. Heat transfer and evaporation in the laser...
Article
A system of optical monitoring and diagnostics of selective laser melting process with alternative beam power density distributions is developed. The experimental work with input parameters variation showed the correlation between obtained power density distribution and geometrical parameters of single tracks. Technological gaps of stable track for...
Article
Full-text available
We present a method of determining the geometric characteristics of gas-powder flow during laser cladding with coaxial injection. We evaluate the effect of the operating parameters (feed rate and channel width of powder injection) on the geometry of particle flow. Optical diagnostics of the laser cladding is carried out by an infrared camera.
Article
Full-text available
The laser treatment processes are specified due to the laser-matter interaction instabilities. Modern additive manufacturing technologies such as selective laser melting provide layer-by-layer part growth with continuous operation for hours and days but without adequate controlling systems at present. In this paper, a method for determining a tempe...
Article
Full-text available
The article presents the optical diagnostics results of the selective laser melting process of single-track production. The track defects detection (such as balling effect, powder free zone formation, sparking) was shown, as well as the visualization of the independent particles consolidation in a solid track. The metal evaporation and the formatio...
Article
Full-text available
Silica glass is an inorganic dielectric material that can be used for laser beam melting without cracking. However, the extremely high viscosity makes consolidation of powder very slow. To study the dynamics of consolidation, a 10.6 μm laser beam was directed on the powder layer deposited on the solid substrate of the same material. The laser-inter...
Article
The recovery of the true temperature of a metal powder during selective laser melting is examined. A method is proposed for determining the temperature of the surface of the melt bath of a metal powder during selective laser melting based on measurements with an infrared camera. The influence of key melt parameters on the geometry of the melt bath...
Article
Full-text available
In the article, the study of laser beam modulation influence on the structure of materials produced by one of the methods of additive manufacturing as selective laser melting (SLM) is provided. For the purpose of creating a smoother temperature gradient and the optimal conditions of the heat and mass transfer in the melting pool, an experimental st...
Article
Full-text available
Purpose – This paper aims to propose methods for on-line monitoring and process quality assurance of Selective Laser Melting (SLM) technology as a competitive advantage to enhance its implementation into modern manufacturing industry. Design/methodology/approach – Monitoring of thermal emission from the laser impact zone was carried out by an orig...
Article
Full-text available
The on-line optical diagnostics studies of selective laser melting are difficult to accomplish due to the need of closed chamber of inert gas protective atmosphere. In this term, this study was initiated to make evidence of oxygen influence on the signal from the melt pool. The results make clear the temperature growth with presence of oxygen and i...
Article
Nowadays the technological perspectives of selective laser melting are limited by available equipment on the market. Most of the manufactures produce SLM-machine with the maximum power of laser system 200 W, this makes processing very slow and it significantly reduces the field of potential applications for the technology. Meanwhile the limits of l...
Article
Full-text available
A system for optical monitoring and diagnostics of the selective laser melting process with different beam power densities has been developed. The relationship between the power density distributions and the geometric parameters of individual tracks has been found. Intervals within which stable individual tracks are formed for different distributio...
Article
Full-text available
The objective of this study is to restore the true temperature in during the process of Selective Laser Melting (SLM) of metal powder (in the present case INOX 316L), that is the actual problem in laser assisted additive technologies. To meet this objective, at the first stage, the temperature was measured on the surface of metal substrate INOX 304...
Article
Full-text available
The article presents a study of selective laser melting process (SLM) namely a study of stable track formation by the example of Co-Cr alloy. The characterization of the main process factors, which have an influence on the parts’ functionality, is developed. The experimental work for the research of two main factors as laser beam power and scanning...
Article
Selective laser melting (SLM) is a modern method for producing objects with complex shape and fine structures in one working cycle from metal powders. Combination of the advanced technology of SLM with unique properties of Ti6Al4V alloy allows creating complex 3D objects for medicine or aerospace industry. Since properties of SLM parts depend on th...
Article
Full-text available
The influence of the power-density distribution within the laser beam on the geometric uniformity of a single track in selective laser melting is investigated. Methods of modifying the mode composition of the laser beam are considered. Preliminary simulation of the power-density distribution in the beam is described. The distribution of heat absorp...
Article
Full-text available
In the article the experimental study of influences of laser beam profiling on the microstructure of the material obtained by selective laser melting is presented. Microstructure was researched by the example of single-track formation. For these needs the optical and video-monitoring stand was constructed. The defects of single-track formation were...
Article
Full-text available
Experimental results on laser beam modulation at selective laser melting (SLM) are presented. The modulation is a possible way to improve the efficiency of the SLM process. The optical diagnostics shows the energy loss up to 30%. This could be a consequence of high thermal gradients in the melt pool resulted by the Gaussian power density distributi...

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Projects

Project (1)
Project
This project aims at applying ICME/CALPHAD method to design new low-cost titanium alloy for additive manufacture process. Milestones include the assessment of thermodynamic and kinetic information of multiple titanium alloy system (e.g. Ti, Al, Fe, Mn, Zr, Mo, Sn, V, etc.), evaluation of alloy response/performance to additive manufacture process (e.g. laser, electron beam, etc.), and optimization of the manufacture process.