Positron lifetime & X-ray particle size measurements during the high cycle fatigue of AISI 4340 steel

1978 ◽  
Vol 9 (9) ◽  
pp. 1344-1345 ◽  
Author(s):  
P. Alexopoulos ◽  
J. G. Byrne
Keyword(s):  
Particle Size ◽  
High Cycle Fatigue ◽  
Positron Lifetime ◽  
Cycle Fatigue ◽  
Aisi 4340 Steel ◽  
X Ray ◽  
4340 Steel ◽  
Aisi 4340

X-Ray Fractography On Fatigue Fracture Surfaces of Aisi 4340 Steel*

1985 ◽  
Vol 29 ◽  
pp. 63-70 ◽  
Author(s):  
Yukio Hirose ◽  
Zenjlro Yajima ◽  
Toshio Mura
Keyword(s):  
Simple Model ◽  
Residual Stresses ◽  
Fatigue Fracture ◽  
Plastic Strains ◽  
X Ray Diffraction ◽  
Aisi 4340 Steel ◽  
X Ray ◽  
Fracture Surfaces ◽  
4340 Steel ◽  
Aisi 4340

The X-ray fractographic technique was applied to fatigue fracture surfaces of tempered AISI 4340 steel. Residual stresses and half-value breadths were measured by the X-ray diffraction.In the present paper, the residual stresses and plastic strains on fatigue fracture surfaces and some parameters in the fracture mechanics were investigated. A simple model of mechanics was proposed to explain these experimental results.

scholarly journals Tempering Influence on Residual Stresses and Mechanical Properties of AISI 4340 Steel

2021 ◽  
Author(s):  
Marcel Souza ◽  
Luana Ferreira Serrão ◽  
Juan Manuel Pardal ◽  
Sérgio Souto Maior Tavares ◽  
Maria Cindra Fonseca
Keyword(s):  
Mechanical Properties ◽  
Residual Stresses ◽  
X Ray Diffraction ◽  
Tempered Martensite ◽  
Tempering Temperature ◽  
Aisi 4340 Steel ◽  
X Ray ◽  
4340 Steel ◽  
Compressive Residual Stresses ◽  
Aisi 4340

Abstract The present work evaluated the tempering temperature influence on microstructure, mechanical properties and residual stresses of AISI 4340 steel. The residual stresses were measured by X‑ray diffraction (XRD) by the sin²ψ method and compared to magnetic Barkhausen noise (MBN). The residual stresses exhibited high tensile values after quenching, but a small relief was observed in tempering treatments at 300°C and 400°C, which also presented a hardness decrease compared to the as‑quenched condition. XRD and MBN analyses indicated that residual stresses became compressive in tempering performed between 500°C and 650°C. Therefore, compressive residual stresses combined with appropriate hardness and toughness values (35 HRC and 33 J) obtained from 500°C tempering temperature can be used to improve the mechanical properties of AISI 4340 steel components. Additionally, a mathematical model was established to estimate the tempered martensite hardness for different tempering temperature conditions. This model showed high accuracy (R2=0.99) for a holding time of 90 minutes.

X-Ray Fractographic Approach to Fracture Toughness of AISI 4340 Steel

1985 ◽  
pp. 289-296 ◽  
Author(s):  
Yukio Hirose ◽  
Zenjiro Yajima ◽  
Keisuke Tanaka
Keyword(s):  
Fracture Toughness ◽  
Aisi 4340 Steel ◽  
X Ray ◽  
4340 Steel ◽  
Aisi 4340

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.

Residual Stresses Near SCC Fracture Surfaces of AISI 4340 Steel

1988 ◽  
Vol 32 ◽  
pp. 451-458 ◽  
Author(s):  
Zenjiro Yajima ◽  
Masaaki Tsuda ◽  
Yukio Hirose ◽  
Keisuke Tanaka
Keyword(s):  
Fracture Surface ◽  
Stress Corrosion ◽  
Crack Nucleation ◽  
Notch Root ◽  
Compact Tension ◽  
X Ray Diffraction ◽  
Aisi 4340 Steel ◽  
X Ray ◽  
4340 Steel ◽  
Aisi 4340

X-ray diffraction observation of the material beneath the fracture surface provides failure analysists with useful information to judge the mechanical condition of fracture.In the present paper, stress corrosion cracking (SCC) tests were conducted by using the bluntly notched compact tension (CT) specimens of 200°C tempered AISI 4340 steel in a 3.5 NaCl solution etwixonmeat. The distribution of the residual stress beneath the fracture surface near the root of the notch was measured with the X-ray diffraction technique. The effect of the notch root radius on crack nucleation with stress corrosion was discussed on the bases of the results of X-ray observation.

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