高压下添加Mg对Cr12Mo1V1钢夹杂物及力学性能的影响
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第一作者：龚伟
通讯作者：姜周华
合写作者：张理想,陈常勇,董艳伍
发表刊物：材料科学与工程A
卷号：791
DOI码：10.1016/j.msea.2020.139410
刊物所在地：England
摘要：Conventional methods that involve an increase in pressure are used to improve the solubility and yield of Mg in the steelmaking. Under high pressure, the effect of Mg addition on the number, morphological characteristics, composition, size, and density of inclusions in Cr12Mo1V1 steel (C: 1.40–1.60 wt%, Si: ≤0.60 wt%, Mn: ≤0.60 wt%, S: ≤0.03 wt%, P: ≤0.03 wt%, Cr: 11.00–13.00 wt%, V: ≤1.00 wt%, and Mo: 0.70–1.20 wt%) is studied. The experiments are made under three contents of Mg: 0, 0.0012 wt% and 0.0041 wt%. Results show that Al2O3 and MnS inclusions transform into approximately spherical MgO·Al2O3 spinel and spherical MgO·MgS inclusions, respectively. At ~0.07 wt% dissolved aluminum content, the micro content of Mg in molten steel leads to the formation of MgO·Al2O3 spinel inclusions. The MgO·Al2O3 inclusions disappear completely when the mass fraction of Mg is larger than 39.734 × 10-6. Further, as the Mg content increases, the number of inclusions <1 μm increases, whereas the number of inclusions >2 μm decreases. Meanwhile, during molten steel solidification, MnS and MnS–MgS precipitate around MgO·Al2O3 and MgO inclusions, respectively. The densities of MgO·Al2O3 spinel inclusions are lower than those of alumina inclusions. As the Mg content in Mg-containing inclusions increases, the density of inclusions decreases, leading to an improvement in inclusion removal efficiency. The role of Mg in the mechanical properties, tensile fracture morphology, and inclusions of quenched and tempered Cr12Mo1V1 steel is also investigated. As the Mg content increases from 0 wt% to 0.0041 wt%, at the tensile fracture, the area of shear lip goes through a process from small to large, the dimples go through a process from generation to deepening, and the strength and plasticity correspondingly increase.
项目来源：国家自然科学基金面上项目
关键字：Cr12Mo1V1 steel, Inclusions, Mg, Thermodynamics, Mechanical properties
论文类型：英国
学科门类：工学
文献类型：JCR 一区
一级学科：冶金工程
页面范围：1-11
ISSN号：10.1016/j.msea.2020.139410
是否译文：否