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

Metals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 856 ◽  
Author(s):  
Hai Fu ◽  
Yilong Liang
Keyword(s):  
Plastic Deformation ◽  
Surface Modification ◽  
Fatigue Performance ◽  
Cycle Fatigue ◽  
Composite Surface ◽  
Aisi 4340 Steel ◽  
Good Surface ◽  
4340 Steel ◽  
Deformation Layer ◽  
Aisi 4340

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.

Wear Behaviour of TiC Coated AISI 4340 Steel Produced by TIG Surface Melting

2015 ◽  
Vol 819 ◽  
pp. 76-80 ◽  
Author(s):  
Md Abdul Maleque ◽  
Belal Ahmed Ghazal ◽  
Mohammad Yeakub Ali ◽  
Maan Hayyan ◽  
Abu Saleh Ahmed
Keyword(s):  
Plastic Deformation ◽  
Wear Resistance ◽  
Steel Surface ◽  
Composite Layer ◽  
Wear Behaviour ◽  
Wear Volume ◽  
Coated Steel ◽  
Aisi 4340 Steel ◽  
4340 Steel ◽  
Aisi 4340

Coating possesses superior wear resistance which makes the material suitable for components subjected to dynamic applications under sever wearing condition and high temperature applications. In this study, TiC coating layer was synthesized by preplacing a 1 mg/mm2of fine size (~40 μm) TiC powder on the surface of AISI 4340 steel. The composite layer was produced by rapidly melting TiC powder together with the substrate steel using tungsten inert gas (TIG) torch welding at a fixed heat input of 1344 J/mm. The wear behaviour of the coated steel was investigated using a universal pin-on-disc tribometer. The microhardness profile of the coating showed increment of the hardness value (almost 5 times higher) than the substrate material. The wear test results showed that the TiC coated steel has lower wear volume loss hence, higher wear resistance compared to the substrate AISI 4340 steel. Incorporation of TiC into the steel surface has improved the wear behaviour of the steel by reduction of plastic deformation and ploughing of the steel surface. The SEM micrograph of the wear worn surface showed mild type of abrasive wear for coated steel whereas, the AISI 4340 steel showed severe type wear with excessive plastic deformation and ploughing.

An improvement in fatigue behavior of AISI 4340 steel by shot peening and ultrasonic nanocrystal surface modification

2020 ◽  
Vol 791 ◽  
pp. 139752 ◽  
Author(s):  
Ruslan Karimbaev ◽  
Young-Sik Pyun ◽  
Erfan Maleki ◽  
Okan Unal ◽  
Auezhan Amanov
Keyword(s):  
Surface Modification ◽  
Shot Peening ◽  
Fatigue Behavior ◽  
Aisi 4340 Steel ◽  
4340 Steel ◽  
Aisi 4340

scholarly journals Optimization of Process Parameters of Shot Peening for AISI 4340 Steel

2018 ◽  
Vol 7 (1) ◽  
pp. 1-4
Author(s):  
Supinderjit Singh ◽  
Ankur Gil ◽  
Dhiraj Parkash Dhiman
Keyword(s):  
Surface Modification ◽  
Process Parameters ◽  
Shot Peening ◽  
Surface Hardness ◽  
Target Surface ◽  
Industrial Applications ◽  
Air Pressure ◽  
Aisi 4340 Steel ◽  
4340 Steel ◽  
Aisi 4340

Surface modification is one of the important requirements of various components used in industrial applications. Shot peening is one of the surface modification techniques which is being widely used in automotive industry to enhance fatigue life and surface characterises of mechanical parts. In this thesis, the development of experimental set up for shot peening has been undertaken to investigate the effect of prominent process parameter on surface characterises of a given target surface. The major objective of this work is to investigate the effect of three prominent process parameters, namely Air pressure, Temperature of target surface and Stand-off distance on surface characteristics of AISI 4340 steel. The work material has been chosen keeping in view its applications in local industry related to automotive components. The performance of peening process has been measured in terms of surface hardness, surface roughness and residual stresses. An experimental design approach Response Surface Method (RSM) has been used for the design and analysis of experimental data. The effect of process parameters on performance characteristics has been depicted with the help of ANOVA. Optimal set of process parameters has been obtained on the basis of desirability approach. The optimised combination for best performance came as (Air pressure – 4.83 bars, Temperature of target surface – 30°C and stand-off distance-178 mm).

scholarly journals Fatigue Performance of AISI 4340 Steel Ni-Cr-B-Si-Fe HVOF Thermal Spray Coated

2015 ◽  
Vol 114 ◽  
pp. 606-612 ◽  
Author(s):  
L.F.S. Vieira ◽  
H.J.C. Voorwald ◽  
M.O.H. Cioffi
Keyword(s):  
Thermal Spray ◽  
Fatigue Performance ◽  
Aisi 4340 Steel ◽  
4340 Steel ◽  
Hvof Thermal Spray ◽  
Aisi 4340
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