Effect of sulfur content on sulfide morphologies and properties of Y12Cr18Ni9 free-cutting steel

doi:10.13251/j.issn.0254-6051.2023.09.031

Abstract

Abstract: Effect of sulfur content on sulfide morphology and properties of Y12Cr18Ni9 free-cutting steel was studied by means of SEM, SEM-EDS, EPMA and EBSD, etc. The phase diagram and equilibrium solidification transformation path of the Y12Cr18Ni9 free-cutting steel were calculated by TCFE10 database of Thermo-Clac software, and the effect of sulfur content change on sulfide precipitation was analyzed. The result show that the main equilibrium phases in the Y12Cr18Ni9 free-cutting steel are Liquid, MnS, δ, γ, M₂₃C₆, σ and α. The sulfides are spherical, ellipsoidal, spindle shape or short-bar-like, which are distributed in chains at grain boundaries or clustered at the trident junction, belonging to a type of II sulfide. With the increase of sulfur content, the amount of sulfide precipitation per unit area in the tested steel increases, and the average area of sulfide increases. The increase of sulfur content can promote the precipitation of sulfide in the Y12Cr18Ni9 free-cutting steel. With the increase of the number of cluster sulfides in the tested steel, the quasi-cleavage surface area of the tensile fracture increases, gradually transforms into brittle fracture, and the mechanical properties of the material decrease.

Key words: Y12Cr18Ni9 free-cutting steel, sulfide, sulfur content, mechanical properties, EPMA, EBSD

CLC Number:

TG142.1⁺3

Wang Yinghu. Effect of sulfur content on sulfide morphologies and properties of Y12Cr18Ni9 free-cutting steel[J]. Heat Treatment of Metals, 2023, 48(9): 183-190.

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