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2 Archives of Metallurgy and Materials

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

100%

Islak S.

tom 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.

Investigation of the usability of cubic boron nitride cutting tools as an alternative to diamond cutting tools for the aircraft industry

51%

Islak S. , Kir D. , Çelik H.

tom Vol. 58, iss. 4

1119--1123

Diamond and cubic boron nitride (cBN) cutting segments were produced using hot pressing technique for this study to be used in cutting natural stone. cBN grains were added to bronze powder, the chosen matrix, at a rate of 0%, 20%, 40%, 60%, 80%, and 100% (according to percentage by weight). Segments were produced under a pressure of 35 MPa, at a sintering temperature of 600°C, over a sintering time of 3 minutes. The cutting properties of the produced segments were determined by cutting Ankara andesite. A Scanning Electron Microscope (SEM) and an X-Ray Diffractometer (XRD) were used to analyse the microstructure, phase compound, and wear surfaces of each segment type.

Diamentowe i wytworzone z regularnego azotku boru (cBN) techniką prasowania na gorąco segmenty tnące zostały zastosowane do cięcia kamienia naturalnego. Ziarna cBN dodano do proszku brązu (matrycy) w ilości 0%, 20%, 40%, 60%, 80% i 100% (wagowo). Segmenty wytworzono pod ciśnieniem 35 MPa, w temperaturze spiekania 600 C, w czasie 3 minut. Właściwości tnące wytworzonych segmentów zostały określone przez cięcie andezytu. Skaningowej mikroskopii elektronowej (SEM) i dyfrakcji rentgenowskiej (XRD) użyto do analizy mikrostruktury, składu fazowego, oraz zużycia powierzchni każdego typu segmentu.