444铁素体不锈钢在合成汽车尾气中的高温氧化响应

IF 1.9 3区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
Bin Sun, Yu-Chen Yao, Qing Lan
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引用次数: 0

摘要

在950℃和1050℃的汽车尾气循环氧化环境中,研究了444铁素体不锈钢的高温氧化行为。在950℃氧化100 h后,444铁素体不锈钢单位面积的增重比在1050℃下的记录低85.7%。两种温度下的氧化垢由Fe-Cr和Mn-Cr尖晶石组成,外层为Cr2O3,内层为Cr2O3。结核的形成和氧化垢的剥落是分离氧化的主要原因。随着氧化时间的延长,内部氧化物的深度逐渐增加。内部SiO2的成核和生长导致金属突起的形成,这些金属突起最终在SiO2层的形成中被消耗掉。在1050℃时,在氧化垢与基体的界面处形成SiO2层。内部SiO2的成核生长和Cr2O3层/基体界面处SiO2的横向生长共同促进了SiO2层的形成。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

High-Temperature Oxidation Response of 444 Ferritic Stainless Steel in a Synthetic Automotive Exhaust Gas

High-Temperature Oxidation Response of 444 Ferritic Stainless Steel in a Synthetic Automotive Exhaust Gas

The high-temperature oxidation behavior of 444 ferritic stainless steel has been studied in cyclic oxidation experiments using synthetic automotive exhaust gas atmospheres at 950 and 1050 °C. The weight gain per unit area of the 444 ferritic stainless steel following oxidation at 950 °C for 100 h iss 85.7% lower than recorded at 1050 °C. The oxide scale at both temperatures consisted of Fe–Cr and Mn–Cr spinels in the outer layer and Cr2O3 in the inner layer. Nodule formation and spallation of the oxide scale are identified as the main causes of breakaway oxidation. The depth of the internal oxides gradually increases with the oxidation time. The nucleation and growth of internal SiO2 result in the formation of metal protrusions, which are eventually consumed in the formation of a SiO2 layer. The SiO2 layer is formed at the interface between the oxide scale and the substrate at 1050 °C. The nucleation and growth of internal SiO2, in combination with lateral growth of SiO2 at the Cr2O3 layer/substrate interface contributed to the formation of the SiO2 layer.

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来源期刊
steel research international
steel research international 工程技术-冶金工程
CiteScore
3.30
自引率
18.20%
发文量
319
审稿时长
1.9 months
期刊介绍: steel research international is a journal providing a forum for the publication of high-quality manuscripts in areas ranging from process metallurgy and metal forming to materials engineering as well as process control and testing. The emphasis is on steel and on materials involved in steelmaking and the processing of steel, such as refractories and slags. steel research international welcomes manuscripts describing basic scientific research as well as industrial research. The journal received a further increased, record-high Impact Factor of 1.522 (2018 Journal Impact Factor, Journal Citation Reports (Clarivate Analytics, 2019)). The journal was formerly well known as "Archiv für das Eisenhüttenwesen" and "steel research"; with effect from January 1, 2006, the former "Scandinavian Journal of Metallurgy" merged with Steel Research International. Hot Topics: -Steels for Automotive Applications -High-strength Steels -Sustainable steelmaking -Interstitially Alloyed Steels -Electromagnetic Processing of Metals -High Speed Forming
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