Development of eco-steels based on the concept of chemical potential gradient

基于化学势梯度概念的生态钢开发

• 批准号: 14550720
• 负责人: OHTANI Hiroshi
• 金额: $ 2.05万
• 依托单位: Kyusyu Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550720/
• 关键词: eco-steels; chemical potential gradient; clad steels; surface treatment; metal spraying process

The diffusion behaviour at the interface of material cladding plain, low carbon steels and high carbon alloy steels has been analyzed using the DICTRA software developed by the Royal Institute of Technology in Sweden. In the selection of cladding materials, the chemical potential of carbon at the selected alloy compositions was obtained using the calculated phase diagrams, and a combination was employed wherein the carbon atoms diffused from the base material, having a lower C content, to the cladding layer, having a higher C content. For example, the cladding material for plain carbon steel containing 0.046% C of a 18Cr-8Ni stainless steel with 0.06% C exhibits an up-hill diffusion for carbon from the base metal to the cladding steel at T=1,200 K, resulting in the precipitation of the Cr23C6 carbide at the materials interface. Such anomalous diffusion behaviour can be explained by the fact that the diffusion is derived from the chemical potential gradient of carbon rather than that of the difference in concentration. In the present work, similar combinations of cladding materials were investigated, and the diffusion behaviour was analysed.

使用瑞典皇家理工学院开发的DICTRA软件分析了普通钢、低碳钢和高碳合金钢材料熔覆界面的扩散行为。在选择熔覆材料时，使用计算的相图获得所选合金成分下碳的化学势，并采用其中碳原子从具有较低C含量的母材扩散到熔覆层的组合，具有较高的C含量。例如，含 0.046% C 的普通碳钢的覆层材料（含 0.06% C 的 18Cr-8Ni 不锈钢）在 T=1,200 K 时表现出碳从母材金属到覆层钢的上坡扩散，从而导致Cr23C6 碳化物在材料界面处析出。这种反常的扩散行为可以用这样的事实来解释：扩散是由碳的化学势梯度而不是浓度差引起的。在目前的工作中，研究了包层材料的类似组合，并分析了扩散行为。

项目成果

鉄系クラッド材の界面における拡散挙動

铁基熔覆材料界面的扩散行为

• 发表时间: 2004
• 作者: 大道雅幸ら

Thermodynamic Analysis of the Fe-Al-C Ternary System by Incorporating ab initio Energetic Calculations into the CALPHAD approach

将从头算到 CALPHAD 方法中的能量计算纳入 Fe-Al-C 三元体系的热力学分析

• 发表时间: 2004
• 作者: H.Ohtani

Construction of Metastable Phase Diagrams Incorporating ab initio Calculations into the CALPHAD Approach,

将从头计算纳入 CALPHAD 方法中构建亚稳态相图，

• 发表时间: 2005
• 作者: H.Ohtani

Thermodynamic analysis of the Co-Al-C and Ni-Al-C systems by incorporating ab initio energetic calculations into the CALPHAD approach

通过将从头计算能量计算纳入 CALPHAD 方法，对 Co-Al-C 和 Ni-Al-C 系统进行热力学分析

• 发表时间: 2004
• 作者: H.Ohtani ら

Thermodynamic analysis of the Co-Al-C and Ni-Al-C systems by incorporating ab initio energetic calculations into the CALPHAD approach

通过将从头计算能量计算纳入 CALPHAD 方法，对 Co-Al-C 和 Ni-Al-C 系统进行热力学分析

• 发表时间: 2004
• 作者: H.Ohtani