Influence of thermal deformation process on morphology evolution of sulfide in cerium-sulfur containing free-cutting stainless steel

doi:10.13251/j.issn.0254-6051.2022.10.016

Abstract

Abstract: Influence of thermal deformation process on morphology evolution of sulfide in cerium-sulfur containing free-cutting stainless steel was studied by means of Gleeble-3500, OM and Phenom Partical X SEM-EDS. The sulfides in cerium-sulfur containing free-cutting stainless steel casting billet are spherical, ellipsoidal, spindle shape or short-bar-like, and distributed in clusters along the grain boundary, belonging to a type II sulfide. At the temperature ranging from 800 ℃ to 1100 ℃, the distribution density of sulfide increases and the average area decreases with the increase of deformation. At the temperature ranging amount from 800 ℃ to 1000 ℃, the proportion of sulfide with length-width ratio≤3 gradually decreases with the increase of deformation amount from 10% to 70%. When the deformation temperature is 1100 ℃ and the deformation increases to 70%, the proportion of sulfide with length-width ratio≤3 increases slightly, and the sulfide melts or re-nucleates. When the deformation amount is in the range of 10%-70%, the relative plasticity of sulfide increases and then decreases gradually after reaching the peak value at 30% deformation. At the temperature ranging from 800 ℃ to 1100 ℃, the relative plasticity of sulfide decreases with the increase of deformation temperature when the deformation amount is constant.It is easier to obtain uniformly dispersed fine sulfide at high temperature and large deformation.

Key words: thermal deformation process, free-cutting stainless steel, sulfide, length-width ratio, relative plasticity

CLC Number:

TG142.7

Wang Yinghu, Zheng Huaibei, Song Lingxi, Liu Tingyao. Influence of thermal deformation process on morphology evolution of sulfide in cerium-sulfur containing free-cutting stainless steel[J]. Heat Treatment of Metals, 2022, 47(10): 99-106.

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