Dry rolling/sliding wear of nanostructured pearlite

Abstract

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 ferrite and cementite components of pearlite in the vicinity of the wear surface. Plasticity is not expected from Hertzian analysis that assumes a smooth contact surface. Instead, it is likely to be a consequence of exaggerated stresses due to surface roughness. The material remains ductile to shear strains in 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.

Melting, Remelting, and Casting for Clean Steel

“…A deep‐etched steel revealing an apparently 1‐D alumina “stringer” to actually be a planar 2‐D feature as would be predicted for the eventual morphology of an alumina bifilm …”

“…The well‐worn phrase “brittle grain boundary carbides” has become a cliché in metallurgical studies . In most cases such precipitates as carbides are immensely strong and crack resistant, and observations of their significant plastic deformation are occasionally reported . In those cases where the precipitate forms on only one side of the bifilm, the appearance is that of the matrix decohering from the precipitate − another phenomenon which would not normally be expected from the immense strengths of most such inter‐phase boundaries.…”

Technological Properties and Applications of High-Carbon Nanobainitic Steels

“…Although such morphological types of bainite were obtained previously [17], the results of tests performed by H. Bhadeshia paved the way for the development of industrial technologies enabling the manufacturing of nanostructural steel products. In addition to the use of the bainitic transformation when making the nanostructure, research works are also concerned with the obtainment of nanopearlite [18,19] and nanomartensite [20,21].…”

Effect of cylinder liner cast iron microstructure on friction and wear process

“…Its lamellar structure can effectively improve the fatigue wear resistance of cast iron. The wear performance of pearlite is mainly affected by lamellar spacing [20,21]. Some research has shown that pearlite with small lamellar spacing has an excellent combination of strength and toughness and good wear resistance [9,22].…”