Development mechanical and fatigue properties of AA7001 after combined SP with deep cryogenic treatment and UIP with deep cryogenic treatment

Authors

DOI:

https://doi.org/10.15587/1729-4061.2021.243391

Keywords:

AA7001, deep cryogenic treatment, ultrasonic impact, shot peening, tensile and fatigue properties

Abstract

Al alloys have long been of interest to the aerospace community, due to their modest specific strength, ease of manufacture, and low cost. In recent years, with the rapid development of weaponry, 7XXX ultra-high strength aluminum alloys used increasingly in military fields. Chemical analysis of the AA 7001 is supported out at The Company State for Engineering, Rehabilitation and Inspection (SIER) in Iraq. Strengthening the surface (shot penning) is beneficial to delay crack nucleation and extend life. The test samples (tensile and fatigue) are subject to the SP process by using ball steel with the parameters (Pressure=12 bars, Speed=40 mm/min, Distance=150 mm, Shot size=2.25 mm, Coverage=100 %). The ultrasonic impact treatment (UIP) machine is used for enhancing the surface properties. For the Deep Cryogenic Treatment (DCT), the samples have been placed in the cooling chamber. A standard tensile test specimen is prepared in a round section with the dimensions chosen according to ASTM (A370-11). Tensile and fatigue of rotating bending with R=–1 have been conducting, after the effect of deep cryogenic treatment (DCT), combined shot peening (SP+DCT), and ultrasonic impact peening (UIP+DCT) of AA7001 have been examining. The maximum improvement percent in ultimate tensile strength (UTS) due to (DCT), (SP+DCT), and (UIP+DCT) were about 3 %, 8.27 %, and 6.25 %, respectively. The rise in the yield stress due to (DCT), (SP+DCT), and (UIP+DCT) were 9.5 %, 14.6 %, and 13.14 %, respectively. The ductility reduced by constituents of 8.57 %, 12.5 %, and 11.42 % sequentially. The improvement in fatigue strength in a high cycle regime is 16 % for (SP+DCT) due to combined effects, it is an 8 % increase in the endurance limit on fatigue behavior due to inducing compressive residual stress (CRS)

Author Biographies

Aseel A. Alhamdany, University of Technology

Assistant Professor, Doctor of Mechanical Engineering

Department of Electromechanical Engineering

Ali Yousuf Khenyab, Al-Salam University

Doctor of Mechanical Engineering

Department of Mechanical Engineering

Qusay K. Mohammed, University of Technology

Assistant Professor, Doctor of Mechanical Engineering

Department of Electromechanical Engineering

Hussain Jasim M. Alalkawi, Bilad Alrafidain University College

Professor, Doctor of Mechanical Engineering

Department of Aeronautical Engineering Techniques

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Published

2021-10-31

How to Cite

Alhamdany, A. A., Khenyab, A. Y., Mohammed, Q. K., & Alalkawi, H. J. M. (2021). Development mechanical and fatigue properties of AA7001 after combined SP with deep cryogenic treatment and UIP with deep cryogenic treatment. Eastern-European Journal of Enterprise Technologies, 5(1(113), 62–69. https://doi.org/10.15587/1729-4061.2021.243391

Issue

Vol. 5 No. 1(113) (2021): Engineering technological systems

Section

Engineering technological systems

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Copyright (c) 2021 Aseel A. Alhamdany, Ali Yousuf Khenyab, Qusay K. Mohammed, Hussain Jasim M. Alalkawi

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