Dry rolling/sliding wear of nanostructured pearlite

Subhankar Das Bakshi, A. Leiro, B. Prakash and H.K.D.H. Bhadeshia


The dry rolling-sliding wear behaviour of pearlite that has an interlamellar spacing of just 85\,nm has been characterised. Its wear resistance is found to be comparable to that of much harder bainitic steels. Microstructural observations indicate that there is substantial plastic deformation of both the ferrite and cementite components of the pearlite in the vicinity of the wear surface. The plasticity is not expected from Hertzian analysis that assumes a smooth contact surface. It is likely instead to be a consequence of exaggerated stresses due to surface roughness. The material remains ductile to shear strains of the order of 4. Diffraction data indicate that the coherent domain size is reduced to about half the interlamellar spacing and that some of the cementite may dissolve and contribute to the expansion of the lattice parameter of ferrite.

Materials Science and Technology 31 (2015) 1735-1744.

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nanostructured pearlite

Hydrogen TWIP Nuclear growth Maraging steel Bearings Bainitic powder
Duplex steel Tetragonal ferrite Bainitic powder Severe tempering Surface hydrogen
Hydrogen TRIP Broken bainite Bearing steel HCP martensite Mn TRIP
Mixed Creep Extraordinary ductility Problems Mechanical stabilisation

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