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Wear Characteristics of FeW/FeW-B4C Coatings Produced by TIG Process

Islak S.

Archives of Metallurgy and Materials

2017

Vol. 62, iss. 4

2001--2006

In this study, wear properties of FeW-B4C coatings produced by tungsten inert gas (TIG) process on the AISI 1060 steel were investigated. TIG process was selected because it is a cost-effective approach for melting-based coatings. The treated surfaces were evaluated and characterized by means of scanning electron microscope (SEM), X-ray diffraction analysis, and electron dispersive spectrometry (EDS). The microhardness and wear experiment were also performed by using a microhardness machine and ball-on-disk tribometer. SEM observations showed that the obtained coating had a smooth and uniform surface. According to XRD analysis, borides and carbides phases formed in the coatings. The wear behavior of the coatings was compared with ball-on-disc configuration wear tests, at the same conditions. Average coefficient of friction values of the coatings were obtained at relatively low levels.

Microstructure and abrasive wear properties of M(Cr,Fe)7C3carbides reinforced high-chromium carbon coating produced by gas tungsten arc welding (GTAW) process

Buytoz Soner, Yildirim M. Mustafa

Archives of Foundry Engineering

2010

Vol. 10, iss. 1 spec.

279--286

In the present study, high-chromium ferrochromium carbon hypereutectic alloy powder was coated on AISI 4340 steel by the gas tungsten arc welding (GTAW) process. The coating layers were analyzed by optical microscopy, X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), X-ray energy-dispersive spectroscopy (EDS). Depending on the gas tungsten arc welding pa-rameters, either hypoeutectic or hypereutectic microstructures were produced. Wear tests of the coatings were carried out on a pin-on-disc apparatus as function of contact load. Wear rates of the all coating layers were decreased as a function of the loading. The improvement of abrasive wear resistance of the coating layer could be attributed to the high hardness of the hypereutectic M7C3 carbides in the microstruc-ture. As a result, the microstructure of surface layers, hardness and abrasive wear behaviours showed different characteristics due to the gas tungsten arc welding parameters.

Numerical Modelling of TIG Process

Pocica A., Nowak A., Mochnacki B., Dziewoński M.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

2002

z. 75

155-158

The numerical model of heat treatment of the casting superficial layer using the TIG method is discussed. This technology consists in the heating of the part of casting surface by the moving external heat source which is displaced with the constant rate along the straight line. The thermal processes proceeding in the heated region are very intensive and the partial melting of the superficial layer takes place. In this way the effect of superficial layer structure appears. In this paper the 3D model of thermal processes in the system heat source - casting surface basing on the finite differences method (FDM) is discussed and the results of numerical computations are shown.

The structure and properties of 7020 aluminium alloy joints welded by TIG process.

Lech-Grega M., Richert M., Kłyszewski A., Kędzior M., Szymański W.

Inżynieria Materiałowa

2001

R. XXII, nr 4

530-534

The study presents analyse the evolution of structure and state of internal stresses in the around-weld region of plates welded by TIG process using different welding currents in Al-Zn-Mg (7020) alloy. The changes of structure were related to the process of growth, dissolution and precipitation fine particles from the solid solution.

Przedstawiono analizę ewolucji struktury i stanu naprężeń własnych w obszarach okołospoinowych płyt spawanych metodą TIG w różnych warunkach prądowych w stopie Al-Zn-Mg (7020). Zmiany struktury były związane z procesami rozrostu, rozpuszczania i wydzielania drobnych cząstek z roztworu stałego.