Effect of Gadolinium on the Deformation of Sulfides and Mechanical Properties of an Al-Killed Resulfurized Steel

Hong Wei, Wen Yang, Lifeng Zhang
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Abstract

The rare earth element Gd was added into a resulfurized steel to enhance its performance. Non-metallic inclusions in the steel, the hardness and the microstructure of the steel were analyzed. The addition of Gd resulted in the formation of Gd–O–S and Gd–S inclusions which served as cores of MnS inclusions so that the resistance to the deformation of inclusions was improved. When the content of the total gadolinium (T.Gd) increased from 0 to 198 ppm, the hardness of the steel matrix increased from 60.4 to 80.4 HRA. The microstructure predominantly consisted of a substantial number of pearlites with a minor presence of ferrites distributed in a network-like pattern. The distribution of ferrites along the grain boundary was weakened when the T.Gd content in the steel was 79 ppm. The tensile fracture of the steel exhibited a mixed ductile-brittle pattern while its impact fracture displayed brittle characteristics.

Abstract Image

钆对硫化物变形和铝烧结硫化钢机械性能的影响
在重硫钢中加入稀土元素钆以提高其性能。分析了钢中的非金属夹杂物、钢的硬度和微观结构。添加 Gd 后形成了 Gd-O-S 和 Gd-S 夹杂,这些夹杂物成为 MnS 夹杂的核心,从而提高了夹杂物的抗变形能力。当总钆含量(T.Gd)从 0 ppm 增加到 198 ppm 时,钢基体的硬度从 60.4 HRA 增加到 80.4 HRA。微观结构主要由大量珠光体组成,少量铁素体呈网状分布。当钢中的 T.Gd 含量为 79ppm 时,沿晶界的铁素体分布减弱。钢的拉伸断裂表现出韧性-脆性混合模式,而冲击断裂则表现出脆性特征。
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