Revealing the oxidation mechanism of ferritic heat resistant steel in high-temperature flue gas

被引：7
作者：
Li, Xiaogang [1 ,2 ]
Li, Kejian [1 ,2 ]
Li, Shanlin [1 ,2 ]
Cai, Zhipeng [1 ,2 ,3 ,4 ]
Pan, Jiluan [1 ,2 ]
机构：
[1] Tsinghua Univ, Dept Mech Engn, Beijing 100084, Peoples R China
[2] Minist Educ, Key Lab Adv Mat Proc Technol, Beijing 100084, Peoples R China
[3] Tsinghua Univ, State Key Lab Tribol, Beijing 100084, Peoples R China
[4] Tsinghua Univ, Collaborat Innovat Ctr Adv Nucl Energy Technol, Beijing 100084, Peoples R China
来源：
CORROSION SCIENCE | 2022年 / 205卷
基金：
中国国家自然科学基金;
关键词：
A; Steel; B; TEM; EPMA; C; Oxidation; Sulphidation; REAL-TIME OBSERVATION; BI EUTECTIC ALLOY; CORROSION BEHAVIOR; MARTENSITIC STEEL; POWER-PLANTS; INTERNAL OXIDATION; FE-9CR-1MO STEEL; CR; IRON; SULFIDATION;
D O I：
10.1016/j.corsci.2022.110441
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Oxidation behaviors of ferritic heat resistant steel T91 exposed to high-temperature flue gas for long term have been investigated in this study. Oxidation mechanism in high-temperature S-containing environment was newly understood and a novel metallurgical model was proposed. It suggested that sulphidation always preceded oxidation by forming CrS/Cr7S8 particles in the front of the internal oxide layer, accompanied by M23C6 dissolution and local matrix recrystallization. CrS/Cr7S8 nucleated around the MX phases at grain boundaries of recrystallized ferrite by diffusion. Sulfur-assisted microstructural evolution fundamentally affected the subsequent internal oxidation, controlling the oxidation mechanism.
引用
收藏
页数：14
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