Microstructural developments during abrasion of M50 bearing steel

Microstructural developments during erosion of tribological steels

“…8(i)) and straight martensite laths after hardening (Fig. 8(ii)) are the predominant phase constituents [1,11]. Lower strain hardening rate is liable to store dislocations in ferrite.…”

“…The crystallographic work hardening of individual crystallite of an orientation has been described by its Taylor factor and shear modulus. It has already been reported that orientations with higher Taylor factors produce shear bands [11]. Hence the Taylor factor based high work hardening and high localized strains usually develop shear bands.…”

“…The plastic zone surrounding the indenting particle is completely confined. Therefore, constrained plastic flow in the presence of high compressive stresses is resulted [11]. The presence of high compressive stress in the plastic zone just beneath the contact surface is known to ensure larger strain greater than tensile fracture strain.…”

“…SFE is strongly governed by alloy composition. In the range of medium SFE the γ iron is known to have comparatively lower SFE than α iron and crystallographic slip is considered to be dominant in steel than twining when they are assumed to be two mutually distinguishable mechanisms [7][8][9][10][11]. Crystallographic slip is known to develop diverse deformed structure based on initial grain orientation and size comprising of loosely tangled dislocations, dislocation cell structure with tight packed dislocation at cell walls and band structure [12].The crucial aspect of deformation behaviour during erosion is the strain and strain rate.…”

“…The high localized strain and strain rate during erosion and abrasion have been observed to develop deformed structure with features like scattered dislocations, dislocation cell structure, deformation bands and grain fragments [13][14][15][16]. The developed structural features precisely manipulate the properties controlling work hardening rate, induce plasticity and toughness [11,12]. Erosion induced microstructural feature developments of 52100 and M50 steels have hardly been characterized and reported.…”