Stability of a Lamellar Structure – Effect of the True Interlamellar Spacing on the Durability of a Pearlite Colony / Stabilność Struktury Płytkowej – Wpływ Rzeczywistej Odległości Międzypłytkowej Na Trwałość Kolonii Perlitu

Abstract

StabIlIty of a lamellar Structure -effect of the true Interlamellar SpacIng on the durabIlIty of a pearlIte colony Stabilność Struktury płytkowej -wpływ rzeczywiStej odległości międzypłytkowej na trwałość kolonii perlituA lamellar microstructure is, beside a granular and dispersive one, the most frequently observed microstructure in the case of metal alloys. The most well-known lamellar microstructure is pearlite, a product of a eutectoidal transformation in the Fe-Fe3C system. The lamellar morphology of pearlite -cementite and ferrite lamellae placed interchangeably within one structural unit described as a colony -is dominant. The durability of the lamellar morphology is much diversified: in the microstructure of spheroidizingly annealed samples, one can observe areas in which the cementite is thoroughly spheroidized, next to very well-preserved cementite lamellae or even whole colonies of lamellar pearlite. The mentioned situation is observed even after long annealing times. The causes of such behaviour can vary. The subject of the previous work of the authors was the effect of the orientation between the ferrite and the cementite on the stability of the lamellar morphology. This work constitutes a continuation of the mentioned paper and it concerns the effect of the true interlamellar spacing on the stability of the lamellar morphology of cementite.

Estimating carbon content in crucible steel using image analysis

“…This is planned for future work, together with other tools, such as instrumental carbon analysis and conventional metallography based on etching using a set of experimentally produced samples.We stress that CSCE is designed for samples that have no directional preference in their microstructure, and where the grain size and BSE phase contrast are sufficiently large to enable an experienced operator to select suitable dark threshold and blur factor settings. Thus, we do not recommend using this tool for the carbon estimation of worked crucible steel samples with their often highly directional microstructures and small grain sizes, which negatively affect the distinction between broken primary cementite and cementite in spheroidized pearlite (Czarski et al 2015).…”

Enhancement of pearlite transformation by Warm Rolling in 1.0C-1.5Cr Steel

“…In bearing steel, there is an intimate relationship between the morphology of pearlite and the subsequent spheroidising structure. Czarski et al [8] found that the stability (durability) of cementite in pearlite was enhanced with the increase of interlamellar spacing. Therefore, the time required for spheroidising annealing was equivalent longer.…”

Structure Refinement of Spring Steel 51Crv4 after Accelerated Spheroidisation

“…One possible way to refine final martensitic structure is refinement of the soft annealed structure before quenching. A conventional soft annealing schedule consists of long-term soaking at a temperature near A c1 and subsequent cooling in the furnace [3,4]. Spheroidisation process can be accelerated by rapid austenitization followed by divorced pearlitic transformation.…”