0.2C-5.0Mn-0.5Si-1.0Al中锰钢选择性氧化的热力学及动力学分析

doi:10.13251/j.issn.0254-6051.2024.11.003

金属热处理 ›› 2024, Vol. 49 ›› Issue (11): 17-22.DOI: 10.13251/j.issn.0254-6051.2024.11.003

0.2C-5.0Mn-0.5Si-1.0Al中锰钢选择性氧化的热力学及动力学分析

周建虎¹, 李岩², 定巍¹, 方琪¹

1.内蒙古科技大学材料科学与工程学院, 内蒙古包头 014010;
2.内蒙古科技大学稀土产业学院, 内蒙古包头 014010

收稿日期:2024-05-14 修回日期:2024-09-09 出版日期:2024-11-25 发布日期:2025-01-09
通讯作者: 方琪,教授,博士,E-mail:fg195461162@126.com
作者简介:周建虎(1998—),男,硕士研究生,主要研究方向为中锰钢的设计与防护,E-mail:13015158642@163.com。
基金资助:
内蒙古自然科学基金(2024MS05012,2023ZD03)

Thermodynamic and dynamic analysis of selective oxidation of 0.2C-5.0Mn-0.5Si-1.0Al medium-Mn steel

Zhou Jianhu¹, Li Yan², Ding Wei¹, Fang Qi¹

1. School of Materials Science and Engineering, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China;
2. School of Rare Earth Industry, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China

Received:2024-05-14 Revised:2024-09-09 Online:2024-11-25 Published:2025-01-09

摘要/Abstract

摘要： 对0.2C-5.0Mn-0.5Si-1.0Al中锰钢进行热、动力学计算,并结合5%H₂-N₂气氛下790 ℃退火过程试验钢的氧化行为分析,研究了合金元素Mn、Al和Si的选择性氧化行为。通过热力学计算了钢中氧化物的析出顺序为Al₂O₃>MnAl₂O₄>SiO₂>MnSiO₃、Mn₂SiO₄或MnO,并确定了790 ℃,-30 ℃露点(P_(O₂)=9.83×10^-23atm)下试验钢的氧化物组成为:MnO+MnAl₂O₄+Mn₂SiO₄。退火后试验钢得到的氧化层产物与热力学计算相一致;外氧化层的主要成分为连续分布的MnO层,在MnO层外还零散分布着先发生选择性氧化的Al、Si氧化物;内氧化层包含Mn-Al-Si-O元素,与MnO+MnAl₂O₄+Mn₂SiO₄的热力学计算结果相一致。利用Wagner模型、铁素体相中合金元素扩散数据,预测了Al和Si元素的内氧化行为,为高强度钢板表面选择性氧化控制提供了理论支持。

关键词: 中锰钢, 热力学, 动力学, 表面选择性氧化

Abstract: Thermal and dynamic calculations were performed on 0.2C-5.0Mn-0.5Si-1.0Al medium-Mn steel, and combined with the analysis of the oxidation behavior of the tested steel annealed at 790 ℃ in a 5% H₂-N₂ atmosphere, the selective oxidation behavior of alloy elements Mn, Al and Si was studied. By thermodynamic calculations, the order of precipitation of the oxides in the tested steel is Al₂O₃>MnAl₂O₄>SiO₂>MnSiO₃, Mn₂SiO₄or MnO, and the composition of the oxides at 790 ℃ and a dew point of -30 ℃(P_(O₂)=9.83×10^-23 atm) is determined to be MnO+MnAl₂O₄+Mn₂SiO₄. The products of oxide layer of the tested steel obtained after annealing are in agreement with the thermodynamic calculations. The outer oxide layer primarily consists of a continuously distributed MnO layer, accompanied by Al and Si oxides which undergo selective oxidation first, distributed outside the MnO layer. The inner oxide layer contains Mn-Al-Si-O elements, which corresponds to the thermodynamic calculation results of MnO+MnAl₂O₄+Mn₂SiO₄. The Wagner model is employed to predict the internal oxidation behavior of Al and Si elements by utilizing the diffusion data in ferrite matrix, which provides theoretical substantiation for the control of selective oxidation on the surface of high-strength steel plates.

Key words: medium-Mn steel, thermodynamics, dynamics, selective oxidation of surface

中图分类号:

TG142.3

周建虎, 李岩, 定巍, 方琪. 0.2C-5.0Mn-0.5Si-1.0Al中锰钢选择性氧化的热力学及动力学分析[J]. 金属热处理, 2024, 49(11): 17-22.

Zhou Jianhu, Li Yan, Ding Wei, Fang Qi. Thermodynamic and dynamic analysis of selective oxidation of 0.2C-5.0Mn-0.5Si-1.0Al medium-Mn steel[J]. Heat Treatment of Metals, 2024, 49(11): 17-22.

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0.2C-5.0Mn-0.5Si-1.0Al中锰钢选择性氧化的热力学及动力学分析

Thermodynamic and dynamic analysis of selective oxidation of 0.2C-5.0Mn-0.5Si-1.0Al medium-Mn steel

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