Effect of Cr-N precipitations on thermal fatigue behaviour of GX-8 steel nitrided layer

被引：5
作者：
Du, Chang [1 ,2 ]
Zhang, Jin [1 ,3 ]
Lian, Yong [1 ,3 ]
Ding, Xiaoyun [1 ,3 ]
机构：
[1] Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Beijing 100083, Peoples R China
[2] North China Inst Sci & Technol, Langfang 065201, Peoples R China
[3] Beijing Key Lab Corros Eros & Surface Technol, Beijing 100083, Peoples R China
来源：
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2022年 / 20卷
关键词：
Salt bath nitriding; GX-8; steel; Thermal fatigue; Cr-N precipitations; Tessellated stress; MECHANICAL-PROPERTIES; M50NIL STEEL; FE-CR; MICROSTRUCTURE; GAS; STRESS;
D O I：
10.1016/j.jmrt.2022.08.106
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Two types of nitrided layers with different nitride precipitates were prepared by salt bath nitriding on the surface of GX-8 steel. The microstructure of the nitrided layers was investigated by SEM, XRD, grazing-incidence XRD and TEM. A cyclic thermal fatigue test system was used to evaluate the influence of nitrides on the thermal fatigue properties of the two nitrided layers. Under the operation of alternating thermal cycles from ambient temperature to 600 degrees C on the surface, the nitrided surface with a compound layer composed of epsilon-Fe2-3N phase and strip-shaped CrN had more cracks and spalling than that of the nitrided layer with nanoscale nitrides. Further analysis revealed that the tessellated stress caused by different thermal expansion coefficients of CrN and alpha-Fe in the interlayer was responsible for the interlaminar deformation, cracking and spalling of the surface. (C) 2022 The Author(s). Published by Elsevier B.V.
引用
收藏
页码：3333 / 3343
页数：11
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