Effect of Si on the partitioning of Mn between cementite and ferrite

Abstract

The interlamellar spacings of pearlitic steels gradually increase as the isothermal transformation temperatures, correspondingly, the tensile strengths decrease, satisfying the Hall–Petch relationship. Si virtually completes its partitioning process during the eutectoid transformation. A depletion of Mn and an accumulation of Si are found in the concentration profiles of 0.95%-Si steel transformed at 793 K in the ferrite, but not in 0.22%-Si steel. It may attribute them to the Si–Mn diffusional flux couplings, which due to the strong interaction between Si and Mn atoms in the α-Fe. Transformation temperature increases to 873 K, a large amount of Mn atoms coming from ferrite cannot timely diffusion to cementite lamella core, forming a localised retention of Mn in the cementite phase side nearby the interface. This is part of a thematic issue on Pearlitic Steel Wires.

Investigation of the Structural Composition of Fe-Mn-Si-Ti-Al-N-C Alloys and the Solubility of Elements in α-Iron

“…is 0.09 ± 0.02% (at. ), respectively [1]. The content of Mn in α-Fe and in the cementite of the alloy with the content of 0.95% silicon is 0.41 ± 0.02% (at.)…”

“…It is known that alloying elements have an effect on phase transformations and the formation of excess phases in steels. Alloying elements can be divided into (where) stabilizing carbides and ferrite in the formation of perlite [1]. Carbide-forming elements include Mn, V, Ti, Cr and Mo [2][3], while non-carbide-forming elements such as Si, Al, Ni and Co [1][2][3] have high concentrations in the α-Fe phase.…”

“…Alloying elements can be divided into (where) stabilizing carbides and ferrite in the formation of perlite [1]. Carbide-forming elements include Mn, V, Ti, Cr and Mo [2][3], while non-carbide-forming elements such as Si, Al, Ni and Co [1][2][3] have high concentrations in the α-Fe phase. The authors found that there is a strong repulsive force between Si and Mn atoms in α-Fe structure of BCC [4].…”

МАТЕМАТИЧНЕ МОДЕЛЮВАННЯ СТІЙКОСТІ ПЕРВИННИХ ФАЗ ПРИ КРИСТАЛІЗАЦІЇ СПЛАВУ Fe-C-Mn-Si-Ti-Al-N

“…Наразі проведені дослідження мікроструктури, фазового складу, як бінарних сплавів Al-Fe, Fe-Si, Fe-Ti, Fe-O та інших, так і тернарних систем Al-Fe-Si, Al-Fe-Ti, Fe-Si-Ti [1][2]. Досить багато робіт присвячені дослідженню багатокомпонентних сплавів, їх фізичних та механічних властивостей [3][4][5][6][7][8].…”

Mechanical Performance‐Based Optimum Design of High Carbon Pearlitic Steel by Particle Swarm Optimization

“…[ 40 ] The latter fine interlamellar spacings give a useful strength increment, which are currently being exploited in high‐carbon steels. Especially, there has been a significant interest in the addition of Si, [ 41 ] in combination with an increased alloying content, and has been recognized as a way to refine the interlamellar spacing and improve mechanical performance. Following this description, such a relationship between microstructure and mechanical properties requires a further understanding.…”