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The effect on wear resistance of laser alloying with chromium and titanium of grey iron parts

100%

Paczkowska M.

Journal of Research and Applications in Agricultural Engineering

2023

tom Vol. 68, nr 2

26--35

The aim of the presented study is to evaluate the influence of laser alloying with chromium and titanium on the surface layer microstructure and abrasive wear resistance of grey iron parts. A coulter flap was chosen as the object of this investigation. To produce the alloyed layer on the area of the flap that is the most exposed to wear, a diode laser was used as the heat source. The investigation demonstrated that laser alloying with chromium and titanium can increase the wear resistance of components working in abrasive conditions. A smaller mass loss after the wear tests in abrasive conditions of soil could be expected. The laser alloyed layer (with a depth of approx. 400 μm) was characterized by a martensite microstructure (mainly), homogenous morphology and fine grains. A fivefold increase in hardness (approximately 1050HV) in comparison to the hardness of the base material and twofold in comparison to the original ledeburitic surface layer of the coulter flap was noted. Some changes after laser alloying in the surface stereometry were observed (a decrease in the roughness parameters is possible). The roughness parameter values after the wear test decreased in the case of the original and alloyed coulter flaps..

Influence of Silicon and Cobalt Laser Alloying on the Microstructure and Nanomechanical Properties of the Gray Cast Iron Surface Layer

100%

Paczkowska M.

Journal of Research and Applications in Agricultural Engineering

2022

tom Vol. 67, nr 2

13--19

The aim of the research was to modify the surface layer of flakc iron by laser alloying with composition of elements: Si and Co and the evaluation of the obtained effects (regarding the changes in the surface layer microstructure and its chosen properties). In the first part, the treatment consist on covering the cast iron surface with the alloying composition layer, and in the second part – heating of this surface with laser beam using molecutar laser. The treatment effects were estimated with: SEM, EDS, hardness tester, nanoindentalion tester and surface profile device. Il was started (among others), that the alloyed zone in the surface layer flake iron after performed laser treatment was gained and it was characterized by following features (in comparison to the core material): fine and homogencous microstructure with some similarities to the hardened white cast iron, presence of Co and increased amount of Si. lt was noticed that such properties as hardness and Young's modulus have been increased.

Laserowa modyfikacja dyfuzyjnie chromowanej stali z użyciem Cr2O3 jako źródła chromu : badania wstępne

63%

Bauer I. , Paczkowska M.

Przemysł Chemiczny

2019

tom T. 98, nr 12

2026--2027

Omówiono wstępne wyniki badania wpływu laserowej modyfikacji dyfuzyjnie chromowanej stali z użyciem Cr2O3 jako źródła chromu na mikrostrukturę i właściwości stali C45. Warstwy chromowane wytworzono metodą proszkową. Przeprowadzono ocenę mikrostruktury i składu chemicznego. Oznaczono grubość, chropowatość i twardość warstwy powierzchniowej. Laserowa obróbka cieplna stali C45 po chromowaniu dyfuzyjnym może wpłynąć na wzrost czasu eksploatacji części maszyn i urządzeń pracujących w różnych gałęziach przemysłu.

A diffusion – chromized C45 steel was laser-modified Cr2O3 as a source of Cr to study effect of the modification on microstructure and properties of the steel. The powder-pack method was used. The microstructure and chem. composition as well as thickness, porosity and hardness of the surface layer were measured. An improvement of the steel was achieved.