CW510L, round bar, d=25 mm

1.0 CW510L, round bar, d=25 mm

Nordic Brass GUSUM CW510L is a lead free (Pb<0.1%). The alloy is approved according to the 4MS list, use for drinking water applications, product groups B-D. The structure is duplex with α and β-phase.
Applications: Low lead brass details e.g. for electrical applications and fittings. The alloy is very well suited for machining as well as hot-stamping. The alloy comes with Aqua Nordic addition for improved machining properties to compensate for lead in traditional free cutting brass with high content of lead, like CW614N. Typical yield/tensile strength (MPa) 130/450. Elongation A50 >40%. Hardness (HRB) ~100.

The alloy is not dezincification resistant. Information from Nordic Brass Gusum data sheet. The material was produced by Nordic Brass Gusum.

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1.0.1 Light microscope images

Material condition: M – As manufactured (extrusion), without specified mechanical properties

CW510L, 100x Magnification

CW510L, 200x Magnification

CW510L, 500x Magnification

Images of etched specimen at 100, 200 and 500 times magnification.
The duplex phase microstructure can be seen. Alpha phase bright and beta phase darker.
Etching: 5g ferric chloride + 10ml conc. hydrochloric acid + 100 ml de-ionised water.
Specimen surface was parallel with extrusion direction (X=ED). Position ¼ depth.

Composition of CW510L

1.0.2 EBSD/EDS analysis in the SEM

EBSD analysis with 1 µm step size

The material show a duplex microstructure consisting of alpha-beta phase. In this limited area it is difficult to make assumptions about grain size, phase fractions and texture.

Specimen surface was parallel with extrusion direction (X=ED). Position ¼ depth.

Surface was OP-S-polished.

FSD image of the area for EBSD analysis.

IPF-Z EBSD map with colours according to crystal orientations in Z direction (transverse dir.).

EBSD phase map, red alpha phase and blue beta phase.

EBSD map showing IPF in X direction (extrusion dir.).

Alpha phase crystal orientations (IPF in ED)

Beta phase crystal orientations (IPF in ED)

Grain- and phase boundaries

In this material there are not a lot of grain boundaries or low angle boundaries. The assumption would be that recrystallisation occurred after extrusion.

Phase boundaries are light blue (aqua) Grain boundaries (>15) are black Low angle boundaries (2-15) are grey Twin boundaries (∑3, 60° <111>) are red

EDS mapping in parallel to EBSD analysis

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Large area mapping – Many (>40) analyses stitched together

The large area make statistics for grain size, phase fractions, texture, etc. better and now it is obvious that there ARE preferred orientations in X (ED). Pole figures for both phases show textures for the alpha phase <100>&<111>//ED, and for the beta phase <110> // ED.