Bijeenkomst Vereniging voor Warmtebehandelingstechniek

Op donderdag 15 sepember houdt de VWT de volgende bijeenkomst.

Onderwerp: Destructief onderzoek in de harderij, stand van zaken anno 2022
Locatie: E10 Hoeve, Brecht
Datum: 15 september 2022
Tijdstip: 17:00 – 21:15 uur (incl. diner)
Informatie en aanmelden:
Programma, deelnamekosten en praktische informatie: een Pdf-bestand wordt binnenkort toegevoegd.

Na registratie, ontvangst en diner zal Bernard Vandewiele, de voorzitter van de Vereniging voor Warmtebehandelingstechniek, het inhoudelijke deel van de avond openen.

19.00 uur – Opening door de voorzitter, Bernard Vandewiele (VDW Consultancy vof)

19.05 uur – Lezing door Glen van Vugt, Struers: Prepareren en etsen, stand van zaken anno 2022

We will explain the basics of cutting, mounting, grinding, polishing and etching of samples. We will look at the novelties in hot and cold mounting and grinding, and discuss the changes in consumables. Why is correct preparation so important for the end result, what are often made mistakes? How can we chemically etch and safely handle chemical etchants and what are alternatives (optical etching and electrolytic etching)?

19.45 uur – Lezing door Peter Doernach, Clemex: Life is to short and to expensive – hardness testing and image analyzing within one machine

Determination of the quality of materials hardness also depends on the homogeneity of the microstructure. There is one way to report all the data of a sample for hardness using the CMT (Clemex Microhardness Testing) software and, in combination with Clemex Vision PE (Image Analyzing software) all necessary parameters of the microstructure, for example grain size, carbide distribution, layer thickness, porosity etc. In that case you can work very efficiently without moving the sample from hardness tester to the microscope. This saves time, place and money all in one, as we have two easy to handle powerful software products at a single workplace.

20.25 uur – Pauze met koffie & thee

20.35 uur – Lezing door Ronald van Dijk, Olympus: Intelligente beeldanalysetechnieken voor metallurgisch onderzoek

This presentation is about image analysis for metallurgical samples. Benefits of using image analysis software instead of human visible inspection is the inspector independently, speed and the possibility to document more data. To compare different production processes or determine the quality of steel, the size and distribution of non-metallic inclusions (NMI) like sulfides and oxides can be analyzed automatically. Different standards, like ASTM E45-18 method A and SEP 1571:2017 method K, are defined for NMI. This can be worst field analysis or all inclusions in a predefined area, according to the norm to use.

To know the grain sizing of your material, the G-number, you can still compare what you see through a microscope with a poster on the wall or use the software to calculate grain sizes. Different approaches are developed like intercept method and planimetric method, based on norms like ASTM E 112- 13 and EN ISO 643:2012. Using software, boundaries of the grains can be found by looking for abrupt deviations in the pixels’ intensity of measuring lines or thresholding complete boundaries. Using a second phase, the software can distinguish between pearlite and ferrite.

By using a cast iron analysis, you can determine the cast iron’s graphite fraction using unetched samples. With etched samples, the ferrite/pearlite fraction can be measured. Using the combination of the sample unetched and etched later on, you can measure graphite, perlite and ferrite. Also the graphite size, form and nodularity can be classified according to several norms like EN ISO 945-1: 2018. For lamellar graphite, the graphite distribution can be selected as well.

Because not all samples and processes are perfect for image analysis, artificial intelligence is upcoming to be able to analyze challenging samples without enough contrast for ‘standard’ algorithms.

21.15 uur – Afsluiting

Het bestuur van de VWT nodigt zijn leden en overige geïnteresseerden van harte uit voor deze bijeenkomst.
Het volledige programma zal spoedig volgen.

Namens het VWT-bestuur,
Bernard Vandewiele (voorzitter)

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