Dispersion of Fine Oxide and Sulfide in Steel Formed by Stable and Metastable Monotectic Reaction

稳定和亚稳偏晶反应形成的钢中细小氧化物和硫化物的弥散

• 批准号: 11450258
• 负责人: ISHIDA Kiyohito
• 金额: $ 9.34万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450258/
• 关键词: Sulfide; Morphology; Steel; Phase Diagram; Solubility product; Eutectic reaction; Monotectic reaction; Solidification

The morphology of TiS and CrS in steels formed during solidification and the modification of this morphology by the addition of some alloying elements were investigated by means of optical and scanning electron microscopy. The thermodynamic analyses of phase equilibria of the Fe-Ti-S and Fe-Cr-S ternary systems were also carried out. The results obtained are as follows :1. The morphologies of TiS can be classified into four types ; (i) fine-particle (ii) globular (iii) rod-like and (iv) plate-like sulfides, which depends on the Ti/S ratio and formation process.2. The morphology of TiS in the Fe-0.5%Ti-0.3%S base alloy is the rod-like sulfide while additions of Mn and Zr change the morphology from rod-like to globular. The morphology of sulfide is discussed in terms of eutectic and monotectic-type phase diagrams in the Fe-sulfide quasi-binary system.3. The solubility product of TiS in steel can be determined.log[Ti]γ[S]γ=7.74-17820/T, log[Ti]α, δ[S]α, δ=8.07-17171/Tlog[Ti]liq[S]liq=7.09-12447/T4. The sulfide morphologies in the Fe-Cr-S ternary alloy are calssified into three types ; (i) cell wall (ii) fine particle and (iii) globular sulfides. Fine particle sulfide morphology is the result of the remelting or the eutectioid reaction attendant on the phase transformation of matrix from δ to γ. The morphology of sulfides changes from the cell wall and the fine particle type to the globular type with increasing Cr content.5. Additions of Mn, Ti or Zr to Fe-Cr-S alloys lead to the formation of MnS, TiS or ZrS with the globular, the rod-like and the polyhedral morphologies respectively, which are due to the sulfide formation tendency of the additions and their effect on the nature of the phase diagram.6. The solubility product of CrS in steel at 1%Cr level is determined.log[Cr]liq[S]liq=3.89-4500/T, log[Cr]δ[S]δ=3.35-6550/Tlog[Cr]γ[S]γ=3.43-7307/T, log[Cr]α[S]α=5.32-9068/T

通过光学和扫描电子显微镜调查的某些分配元素的诱惑，在对这些形态的溶解过程中形成的Teel的形态。也可以将TIS的形态分为四种类型（I）粒子（ii）球形（III）杆状和（IV）板状硫化物，这取决于Ti/S的比率和形成过程。 2。在Fe-0.3％的硫化物中TI的形态，而Mn和Zr的添加将形态从类似杆的形态变为硫化物的形态。系统3。 = 8.07-17171/tlog [ti] liq [s] liq = 7.09-12447/t4。 LE硫化物的形态是对基质从δ到γ的相变的均变形的结果Mn，Ti或Zr至Fe-Cr-S合金的形成，导致Mns，Zrs与球形，棒状和多面体形态的ZR形成及其对相图性质的影响。6。确定钢中Crs在1％Cr水平上的溶解性产物。 [s]γ= 3.43-7307/t，log [cr]α[s]α= 5.32-9068/t

项目成果

K.Oikawa: "Morphology Control of MnS Inclusions in Steel during Solidification by the Addition of Ti and Al"Z. Metalkde. 90. 13-18 (1999)

K.Oikawa：“通过添加 Ti 和 Al 来控制凝固过程中钢中 MnS 夹杂物的形态”Z。

K.Ishida: "Phase Equilibria and Microstructural Control of Iron-base Alloys"In Computational Materials Design, Springer Series in materials Science, Ed.by T.Saito, Springer-Verlag. vol 34. 135-161 (1999)

K.Ishida：计算材料设计中的“铁基合金的相平衡和微观结构控制”，Springer 材料科学系列，T.Saito 编，Springer-Verlag。

K.Ishida: "Phase Equilibria and Microstructural Control of Iron Base Alloys"Computational Material Design, Springer Series. 34. 135-161 (1999)

K.Ishida：“铁基合金的相平衡和微观结构控制”计算材料设计，施普林格系列。

K.Oikawa, T.Ikeshoji, H.Mitsui and K.Ishida: "Morphology Control of Sulfide in Fe-Cr-S Alloys during Solidification"Mater.Res.Soc.Symp.Proc.. 580. 369-374 (2000)

K.Oikawa、T.Ikeshoji、H.Mitsui 和 K.Ishida：“凝固过程中 Fe-Cr-S 合金中硫化物的形态控制”Mater.Res.Soc.Symp.Proc.. 580. 369-374 (2000)

K.Oikawa, S.I.Sumi and K.Ishida: "The Effects of Addition of Deoxidation Elements on the Morphology of (Mn, Cr) S Inclusions in Stainless Steels"J.Phase Equilibria. 20. 215-223 (1999)

K.Oikawa、S.I.Sumi 和 K.Ishida：“添加脱氧元素对不锈钢中 (Mn, Cr) S 夹杂物形态的影响”J. 相平衡。