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Open AccessArticle

Study of the Surface Integrity and High Cycle Fatigue Performance of AISI 4340 Steel after Composite Surface Modification

1,2,3 and 1,2,3,*
1
College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China
2
Guizhou Key Laboratory of Materials Strength and Structure, Guiyang 550025, China
3
High Performance Metal Structure Material and Manufacture Technology National Local Joint Engineering Laboratory, Guiyang 550025, China
*
Author to whom correspondence should be addressed.
Metals 2019, 9(8), 856; https://doi.org/10.3390/met9080856
Received: 7 July 2019 / Revised: 2 August 2019 / Accepted: 3 August 2019 / Published: 6 August 2019
(This article belongs to the Special Issue Advanced Surface Enhancement)
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PDF [6008 KB, uploaded 6 August 2019]
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Abstract

In the field of materials science, the fabrication of a material with severe surface plastic deformation and a good surface state is an issue encountered in the development of counterbalanced gradient materials. For this paper, AISI 4340 steel was first processed with abrasive water jet peening (AWJP) and then with ultrasonic surface rolling (USRE) to obtain a good surface state while maintaining large plastic deformation. The AISI 4340 steel composite surface was therefore modified, and the surface integrity and cycle fatigue performance were analyzed. The results show that the plastic deformation layer of the modified composite surface of the 4340 steel was 310 µm from the surface of the sample, the grain size 40 µm from the surface layer was refined to 70 nm, and the maximum surface roughness Ra is 0.06. The fatigue limit of the modified composite surfaces obtained by the tensile fatigue test was 595.7 MPa, which was 85.7 MPa higher than the 510 MPa fatigue limit of the unmodified matrix, indicating that the method of composite surface modification can produce a deep deformation layer while maintaining good surface conditions. The results show that work hardening caused by a composite surface treatment is the most important factor for improving the fatigue performance of materials. View Full-Text
Keywords: AISI 4340 steel; abrasive water jet peening; ultrasonic surface rolling; fatigue performance; nano-gradient; structure roughness AISI 4340 steel; abrasive water jet peening; ultrasonic surface rolling; fatigue performance; nano-gradient; structure roughness
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Fu, H.; Liang, Y. Study of the Surface Integrity and High Cycle Fatigue Performance of AISI 4340 Steel after Composite Surface Modification. Metals 2019, 9, 856.

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