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Effects of laser heat treatment of steel following diffusion chromizing

Bauer I., Paczkowska M.

Journal of Achievements in Materials and Manufacturing Engineering

2017

Vol. 83, nr 2

49--56

Purpose: This paper presents the findings of a study of laser heat treatment of C45 steel following diffusion chromizing. The aim of the study was to assess the effect of laser heating of steel subjected on the microstructure of its surface layer. Design/methodology/approach: Diffusion chromizing was conducted at the temperature of 1050°C for 8 hours in a LABOTHERM LH15/14 laboratory furnace. A powder mixture of the following composition was used to produce the layer: Cr2O3 with an addition of Al, kaolin and an activator – ammonium chloride NH4Cl. Diffusion chromizing of C45 steel was followed by laser heat treatment with a dual diode TRUDISK 1000 laser device. The treatment was carried out in four variants with a laser beam of 400 to 900 W. The microstructure of the surface layer was assessed with a scanning electron microscope Tescan Vega 5135. Hardness tests were carried out by the Vickers method on crosswise microsections. The chemical composition of the diffusion layer was assessed by optical emission spectrometry. Findings: The results revealed the presence of a modified surface layer following laser heat treatment in each of the variants. Research limitations/implications: This study focuses on the effect of laser heating of C45 steel subjected to diffusion chromizing on the microstructure of its top layer. Presented research are the first step of the investigation of the surface layer of steel after diffusion chromizing and laser treatment. Next one will be consisted in detailed investigation of microstructure (phases identification) of the achieved surface layer using (among other methods) X-ray diffraction. Practical implications: Laser heat treatment of C45 steel after diffusion chromizing can be applied to parts of machines and devices used in various branches of industry exposed to tribological wear and corrosion. Originality/value: The results of the experiment were affected by the composition of the powder mixture and process parameters of the diffusion chromizing and the laser treatment.

Analiza przydatności metody badania powłok antyrefleksyjnych za pomocą termowizji.

Przybyłowicz K., Orzechowski T., Depczyński W.

Inżynieria Materiałowa

2002

R. XXIII, nr 5

669-671

W pracy przedstawiono opis oraz wyniki badań laboratoryjnych przydatności metody "próbki klinowej" do badania absorbcyjności powłok antyrefleksyjnych przy laserowym nagrzewaniu stali. Eksperymenty przeprowadzono w Centrum Laserowych Technologii Metali Politechniki Świętokrzyskiej. Do laserowego nagrzewania próbek użyto lasera gazowego CO2 o długości fali 10,6 mikrometra. Do wizualizacji procesu nagrzewania użyto kamerę termowizyjną AGEMA THV Series (R) 900LW. Uzyskane dane pozwoliły na dokonanie analizy przydatności metody oraz określenie właściwych wymiarów próbek klinowych. Wyniki przedstawiono w postaci wykresów.

A newly-invented research method of convergent specimen has been applied. The analysis of temperature distribution has been carried out by FLIR camera. Method's usefulness has been specified for different kinds of absorptive coatings. Data obtained through research permit to use convergent specimen method to describe absorbtivity of antireflexive coatings. Results have been presented in graphs.