Three-Body Abrasive Behavior of Cementite–Iron Composite with Different Cementite Volume Fractions
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Cementite–iron composites with 0, 7.83, 18.56, 49.21, 81.75 and 100 vol% cementite were prepared by melting and plasma spark sintering. The effect of cementite content on microstructure, mechanical properties and wear resistance of the cementite–iron composites was investigated. Scanning electron microscopy and X-ray diffractometry results indicate that the cementite–iron composite microstructure consists of cementite (θ), pearlite and ferrite. Subsequently, the wear behavior of cementite–iron composites was studied using a three-body abrasive wear tester. An increase in volume fraction of cementite improved the wear resistance due to the increased material hardness under an applied pressure of 0.065 MPa. When the volume fraction of cementite is greater than 81.75 %, the wear resistance decreases at an applied pressure of 0.098 MPa because of the increased fracturing and peeling off of the cementite. The bulk wear-resistant hard phase (cementite) and toughness matrix (pearlite) composite structure has a better abrasive resistance in white cast iron with 18.56 and 49.21 % cementite volume fractions under a higher impact load, because of the combined protective and supporting effect. Work hardness changed the mechanical properties of composite. Meanwhile, the wear resistance is improved for pure iron and eutectoid steel. The subsurface depth as measured by nanoindentation and metallographic analysis of a vertical section was ~5 mm. The hardness and elastic modulus decreased significantly with increase in subsurface depth. The surface roughness of composites with different cementite contents has been described and analyzed using three-dimensional laser scanning microscopy.
KeywordsThree-body abrasive wear Single-phase cementite Wear resistance Surface roughness
This work was supported by the National Natural Science Foundation of China (51271142, 51371138) and the Program for New Century Excellent Talents in University (NCET-12-0457).
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