Transactions of Materials and Heat Treatment

Title：High-temperature oxidation characteristics of 40CrNi4Mo1V high-strength steel

Authors： Han Chong1 Liu Jiawei1 Lin Junpin2 Zhang Xiaobao1 Zhao Yang1 Cao Xiao1

Unit： 1. China Academy of Machinery Beijing Research Institute of Mechanical & Electrical Technology Co. Ltd. 2.State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing

KeyWords： 40CrNi4Mo1V high-strength steel oxidation temperature oxidation time oxide layer thermal crack

ClassificationCode：TG172.3

year,vol(issue):pagenumber：2025,50(3):51-57

Abstract：

The oxide layers formed on 40CrNi4Mo1V high strength steel at 950 and 1220 ℃ in air for 1-10 h were investigated, and the morphology, thickness, composition, thermal cracks and endogenous oxide particles of the oxide layer were analyzed by optical microscopy, field emission scanning electron microscopy and energy spectroscopy. The results show that the oxidation temperature exerts a more substantial influence on the thickness of oxide layer compared to the oxidation time. Oxidation at 1220 ℃ for 10 h forms an oxide layer with a thickness of exceeding 3800 μm. In the transition zone from the oxide layer to the matrix, there is a mixed structure of Fe-Cr oxide phases and Fe-Ni metal phases. Along the direction close to the matrix, the mass fraction of Ni in the Fe-Ni metal phase decreases from 64.2% to 9.5%. The mechanical interlocking of the Fe-Cr oxide phase and the Fe-Ni metal phase increases the adhesion of the oxide layer, destroys the continuity of the matrix metal, and causes thermal cracking in the matrix. The capillary siphon effect of the primary microcracks increases the oxygen concentration in the cracks. The oxidation of Cr and Fe elements at the cracks causes volume expansion, accelerates the crack propagation, and forms endogenous oxidation particles mainly composed of Fe-Cr oxides near the cracks.

Funds：

国防基础科研计划（JCKY2022208A002）

作者简介：韩冲（1990-），男，工学学士，工程师 E-mail：2234852297@qq.com 通信作者：刘佳伟（1990-），男，博士，助理工程师 E-mail：liu_jiawei163@163.com

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