Role of Subordinate Phases on the Dry Impact‑Abrasion Behavior of Low Chromium Cast Iron

다국어 초록 (Multilingual Abstract)

In order to study the resistance mechanism of materials having high resistance to impact-abrasion, synergistic effect ofsubordinate phases of 2.20 wt%C–3.45 wt%Cr–3.06 wt%Mn–1.32 wt%Si–0.51 wt%Cu–0.31 wt%Ni–0.002 wt%B cast ironwas investigated under dry impact-abrasion. Subordinate phases consist of graphite, secondary precipitates and retainedaustenite. Results show that the synergistic effect of above subordinate phases can prevent matrix and carbide from peelingoff, and minimize the damage of carbide to matrix. This effect reduces the depth and width of groove from 7 to 1.2 μm andfrom 14 to 2.5 μm respectively. Above significant improvement is owing that: (1) Graphite can disperse external/internalstress, and fill carbide peeling pits. (2) Secondary precipitates, such as [Fe, Ni] and [Cr, Ni], can disperse the concentratedstress of carbide, inhibiting peeling. (3) Retained austenite can disperse the internal concentrated stress which is transferredfrom the carbide and fine precipitates to matrix.

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