Experimental Investigation of Phase Equilibria in the Ni-Cr-Si Ternary System

Study into the structural­phase transformations accompanying the resource­saving technology of metallurgical waste processing

“…Authors of work [13] [14] studied experimentally the reduction of chromic ore by particles of Si and SiC in the temperature range from 1,389-1,661 K. the revealed the formation of metal particles with components of Fe, Cr and Si and established that temperatures above 1,473 K are required to reduce chromic ore. Article [15] describes a pattern of increasing the degree of reduction of Cr from ore raw materials in the temperature interval of 1,573-2,473 K from 42.7 % to 95.1 %.…”

“…However, the issue related to the influence of reducing factors on the phase and structural component of targeted products was not studied in detail. Significant results from studying the existence of phases in systems Fe-Ni-Si are given in [11], Fe-Cr-C-Siin [12], and in system Ni-Cr-Siin [13]. Also significant are the results from a study into the progress of restoration in systems Cr-Fe-O-C-Si [14] and Ni-Cr-Fe-O-C-Si [15].…”

In Situ and Ex Situ Characterization of the Microstructure Formation in Ni-Cr-Si Alloys during Rapid Solidification—Toward Alloy Design for Laser Additive Manufacturing

“…Based on the reaction scheme for the Ni-Cr-Si system reported by Schuster and Du [ 36 ], a likely phase formation pathway for observed microstructure is proposed. Here, (Ni) and an intermediate phase, τ 1, form first from the melt (L → (Ni) + τ 1 ) followed by a ternary peritectic reaction (L + (Ni) + τ 1 → π-Cr 3 Ni 5 Si 2 ) [ 13 , 36 ]. The peritectic reaction should start at the grain boundaries between (Ni) and τ 1 phase, and progress outwards, which explains the enveloped structure of π-Cr 3 Ni 5 Si 2 grains surrounded by (Ni) phase in Figure 5 c,d.…”

“…However, it is ambiguous whether τ-Cr 6 Ni 16 Si 7 phase or τ 1 phase is in phase equilibrium since the stability of τ-Cr 6 Ni 16 Si 7 phase in Ni-Cr-Si system is not established [ 15 , 36 ]. Nevertheless, the phase transformation pathway was severely altered by increasing the cooling rates indicated by the presence of metastable high-temperature ternary phases [ 13 ] in the terminal microstructure see Figure 5 f,h.…”

“…These alloys often contain hard transition metal silicides, which have high strength, excellent wear, corrosion, and oxidation resistance. Promising candidates for structural components or coatings have been outlined by Liu et al [ 13 ].…”