Evaluation of abrasive‐wear and erosion‐corrosion resistance of high‐Cr cast‐steel

Abstract

In order to evaluate the performance of high-Cr cast-steel (15.4% Cr), as a pump casing material, abrasive wear, hardness. corrosion, erosion-corrosion resistance were examined and compared with grey cast iron eventually used. The results obtained were analyzed on a microstructural basis with respect to Cr content of the matrix, amount and types of carbides and the extent of surface passivation. Martensitic high-Cr steel has shown a better performance than grey cast iron. Abschatzung des Widerstandes gegen AbrasivverschleiB und Erosionskorrosion fiir hochlegierten ChromstahlguB. Um die Eignung von hochlegiertem ChromstahlguB (15.4% Cr) als Werkstoff tor Pumpengehause abzuschatzen, wurden Harte, Korrosionsverhalten sowie der Widerstand gegen AbrasivverschleiB und Erosionskorrosion ermittelt. Die Oaten wurden mit denen tor GrauguB, der ebenfalls fur diese Anwendung infrage kame, verglichen. Neben dem Chromgehalt der Matrix, Menge und Typ der Carbide ist auch das AusmaB der Oberflachenpassivierung van Bedeutung. Die Ergebnisse fOhrten zu dem SchluB, daB martensitischer hochlegierter ChromstahlguB sich tor die genannte Anwendung besser als GrauguB eignet.

Corrosion and Wear Behaviour of Boronized high Carbon and Chromium Cast Steel

“…The homogenised steel that was worn on the DIN1.7225 quality counter sliding disc had a mild wear mechanism under all of the applied loads. On the DIN1.2379 quality counter sliding disc, while a mild wear occurred at loads lower than 20 N, the wear became severe with increasing loads above 20 N. The present results are congruent to the previous studies [9][10][11][12][13][14][15][16][17][18] that wear resistance Fig. 4.…”

“…However, the carbide particles in these alloys commonly act as cathodic phases in corrosive media and are classified into two groups; the strong cathodic phase having low corrosion potential, such as Fe 3 C, Cr 23 C 6 , etc, and the weak cathodic phase that even can be oxidised in acidic media, such as intermetallic compound phase sigma. [9][10][11][12][13][14][15][16][17][18] There are limited number of studies 19,20) on wear and corrosion behaviour of steels containing high amount of Cr (i.e. more than 25% Cr) and a boronising surface.…”

Erosion-corrosion

“…For alloy steels, the addition of alloying elements such as Ni, Mn, Mo, and Cr improves the corrosion resistance of the alloy. Samy [41] reported that alloy steels with higher Cr have better erosioncorrosion resistance because increasing Cr increases both corrosion resistance and mechanical properties.…”