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Wpływ warunków obróbki stali 17-4PH na efekty procesu szlifowania wgłębnego wałków

100%

Sikora M. , Kruszyński B.

tom R. 89, nr 8-9

1144--1145

Zaprezentowano badania szlifowania martenzytycznej stali 17-4PH w różnych warunkach obróbki. Próby wykonano na szlifierce kłowej do wałków, z zastosowaniem ściernic ceramicznych. Przeprowadzono analizę wpływu warunków obróbki na chropowatość szlifowanych przedmiotów oraz na zmiany składowych sił szlifowania.

In the paper grinding process has been studied on the machining martensitic steel 17-4PH for different grinding kinematic parameters in plunge cylindrical grinding. Grinding tests were carried out on cylindrical grinding machine with the use of vitrified grinding wheels. An analysis of influence of grinding conditions on surface roughness and changes of grinding force components is presented.

Microstructure characterization of welds in X5CrNiCuNb16-4 steel in overaged condition

48%

Ziewiec A. , Zielińska-Lipiec A. , Kowalska J. , Ziewiec K.

2019

tom Vol. 19, nr 1(59)

57--69

The paper presents the results of the investigation of microstructure of the welded X5CrNiCuNb16-4 (17-4PH) steel after solution treatment and aging at 620°C for different periods. The microstructure and the phase composition of the steel was investigated using light microscopy (LM), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), transmission electron microscopy (TEM) and the X-ray diffraction (XRD). Hardness was measured for samples aged at different times. Density distributions of Cu precipitates were established. The investigation has shown that the microstructure of the X5CrNiCuNb16-4 steel welds after aging at 620 ° C consists of tempered martensite, fine Cu precipitates and austenite. It was observed that the size of the Cu precipitates increases with increasing the aging time, what affects the decrease of hardness. Simultaneously, the quantity of reversed austenite increases with increase of aging time. It was revealed that enrichment of the austenite in Ni, Cu and C affects the increase of Ms, but this factor does not determine the stability of austenite.