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The influence of arc plasma electric and laser treatment on the structure and properties of the high speed steel

100%

Bochnowski W.

tom Vol. 9, iss. 3

17-20

The examination of the structure, hardness and abrasion resistance of surface layer of high speed steel: HS 2-10-1-8, HS 6-5-2 and HS 10-2-5-8 after arc plasma and laser welding are presented in the paper. They are compared with the properties obtained after conventional hardening. Diode laser of continuous operation and GTAW (Gas Tungsten Arc Welding) method were used. As a result of concentrated energy beam treatment applied to a steels surface layer, the structures characteristic of rapid solidification / crystallization process were obtained. The treatment of the steel by arc plasma electric with a single remelted track about 7 mm width does not lead to growth of the mechanical and tribological properties of high speed steels. The growth of microhardness as well as low the coefficient Archard of the high speed steel after remelting on the surface single track about 6 mm width by diode laser using can be obtained.

Influence of parameters GTAW remelting process on the tribological properties of the 100Cr6 bearing steel

100%

Bochnowski W.

2011

tom Vol. 11, iss. 3

43-46

In this work, the influence of parameters gas tungsten arc welding on the surface properties of a 100Cr6 steel was studied. Four different the current intensity has been used to remelting surface of the steel. Results of the effect of the current intensity arc electric on the microhardness, friction coefficient and wear intensity 100Cr6 steel was presented. Wear mechanisms were investigated by optical and scanning electron microscopy. Tribological test showed that the remelting with current intensity to 60A surface of the 100Cr6 leads to reduction of wear intensity in comparison to the conventional heat treatment. If treatment was made with current arc intensity - 80 A and more the wear intensity increased. During tribology tests two kinds wear material were distinguished: abrasive wear and adhesive wear.

The quantitative analysis of carbide phase in high speed steels

100%

Bochnowski W.

tom Vol. 7, iss. 3

29-32

The examinations of the structure and the quantitative analysis of the carbide in high speed steels HS 2-10-1-8, HS 6-5-2, HS 10-2-5-8 are concluded in this case study report. Analysis of structure was carried out based on the scanning electron microscopy images. Computer system of images analyzed by the Multiscan was used to measurement the diameters of carbides. The diameter mean distribution of the carbides was described by function, on the basis of the work by J. Cybo, S. Jura [1]. Coefficients of the approximate function were used to calculate the stereoliogical parameters of the carbides.

Naprężenia własne w stali C45 nadtapianej laserowo

51%

Bylica A. , Bochnowski W. , Więcek G.

tom R. 6, nr 19

43-48

W pracy przedstawiono wyniki badań metalograficznych SEM, pomiarów mikrotwardości HV0,1 oraz wyznaczono naprężenia własne w warstwie wierzchniej stali C45 nadtopionej wiązką lasera CO2.

The paper presents the results of laser surface modification on the C45 medium carbon steel. The laser heat treatment has been carried out by CO2 laser beam. Scanning electron microscopes and Vickers hardness tester were used to investigate structure and microhardness of the surface layer. Residual stresses in the laser remelted zone measurement by Waissman - Phillips method. In the microstructure after laser remelting three zone have been observed: remelted zone (of microhardness 480 -610 HV0,1), heat affected zone to solidus temperature (of microhardness 450 -550 HV0,1) and heat affected zone to temperature with range A1 - A3. This surface layer performs different residual stresses: compression (ab. 300 MPa) and tenssion (ab. 150 MPa).