NDLI: Very High Cycle Fatigue Properties of 18CrNiMo7-6 Carburized Steel with Gradient Hardness Distribution

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Very High Cycle Fatigue Properties of 18CrNiMo7-6 Carburized Steel with Gradient Hardness Distribution

Content Provider	MDPI
Author	Yang, Shaopeng Cheng, Peifeng Hu, Fangzhong Yu, Wenchao Zhang, Chi Wang, Kaizhong Wang, Maoqiu
Copyright Year	2021
Description	As research of the high cycle fatigue of carburized gear steel could not meet the status quo of longer and longer service lives, research of very high cycle fatigue (VHCF) performance has become the focus of current research. The VHCF properties of case-hardening steel 18CrNiMo7-6 after being carburized with gradient hardness distribution were investigated by means of ultrasonic fatigue tests. The results showed that the carburized specimens with a case hardness of 705 HV and core hardness of 530 HV showed VHCF phenomenon, and the fatigue lives continuously increased to even $10^{9}$ cycles as the stress amplitude decreased to about 500 MPa. Observations of the fracture surfaces of the fatigue specimens showed that the fatigue crack initiation sites were located in the transition area with the hardness at about 580 HV. It was found that the transition area had low VHCF properties, since the core did not show VHCF phenomenon, and the case had a higher hardness. A fine microstructure was observed in the granular bright facet (GBF) area, and the stress intensity factor $Δ$ K_{GBF}$ was measured to be 3.04 $MPam^{−1/2}$. The $10^{9}$ cycles fatigue life was predicted based on the inclusion size, and the $10^{10}$ cycles fatigue life was 490 MPa based on the prediction model.
Starting Page	1482
e-ISSN	20796412
DOI	10.3390/coatings11121482
Journal	Coatings
Issue Number	12
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2021-12-02
Access Restriction	Open
Subject Keyword	Coatings Characterization and Testing of Materials Carburized Gear Steel Very High Cycle Fatigue Stress Intensity Factor Fatigue Prediction Model
Content Type	Text
Resource Type	Article

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