Abstract
15 wt% Cr sintered High Chromium Cast Iron (HCCI) with full density was successfully prepared by Super-solidus Liquid Phase Sintering (SPLS) technique, with water atomized 15 wt% Cr high chromium cast iron powder as initial materials. Its densification behavior and microstructure evolution in SPLS process and mechanical properties were investigated systematically. Additionally, the impact abrasive wear resistance under different impact energies were also analyzed and compared with another sintered HCCI with 20 wt% Cr. The results indicated that sintering temperature has a strong influence on the sintered alloy’s density, hardness, impact toughness and bending strength. The M7C3 type (M is Cr and Fe) carbides were obviously coarsened as temperature increased and their rod-shaped branches were fully developed at the same time, thereby resulting in carbide network formation in the matrix. The reasonable sintering temperature range was 1195–1205 °C, and the optimum mechanical properties had the hardness of 63.9 HRC, bending strength of 2112.65 MPa and impact toughness of 7.92 J/cm2. What is more important impact abrasive wear test results indicated 15 wt% Cr sintered HCCI’s wear resistance could be comparable to 20 wt% Cr sintered HCCI under impact energy 1~3 J/cm2, and it is more cost effective.
Highlights
High Chromium Cast Iron (HCCI) has been widely used in mining and cement industries because of its excellent wear resistance [1]
15 wt% Cr sintered High Chromium Cast Iron (HCCI) with full density was successfully prepared by Super-solidus Liquid Phase Sintering (SPLS) technique, with water atomized 15 wt% Cr high chromium cast iron powder as initial materials
The results indicated that sintering temperature has a strong influence on the sintered alloy’s density, hardness, impact toughness and bending strength
Summary
High Chromium Cast Iron (HCCI) has been widely used in mining and cement industries because of its excellent wear resistance [1]. Some techniques have been adopted to further enhance HCCI's mechanical properties and expand its application range, such as alloying [3,4,5,6,7,8,9,10,11,12,13], modification treatment [14, 15] and heat treatment [3, 16,17,18,19,20,21] These techniques can strengthen HCCI's matrix, optimize its microstructure, and adjust M7C3 type carbide's size and morphology. Cast HCCI's mechanical performance has the bending strength of 1000~1200 MPa, hardness of 58~62 HRC and impact toughness of around 6~8 J/cm with a 10 × 10 × 50 mm unnotched sample. Its performance is usually disqualified in applications with high impact due to its insufficient strength and impact toughness
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