Influence of shot peening parameters on high-cycle fatigue strength of steel produced by powder metallurgy process

2015 ◽  
Vol 38 (10) ◽  
pp. 1246-1254 ◽  
Author(s):  
H. K. Akyıldız ◽  
M. K. Kulekci ◽  
U. Esme
Keyword(s):  
Powder Metallurgy ◽  
Fatigue Strength ◽  
Shot Peening ◽  
High Cycle Fatigue ◽  
Cycle Fatigue ◽  
Powder Metallurgy Process ◽  
Metallurgy Process

scholarly journals The Effect of Baking Heat Treatment on the Fatigue Strength and Life of Shot Peened 4340M Landing Gear Steel

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5711
Author(s):  
Seok-Hwan Ahn ◽  
Jongman Heo ◽  
Jungsik Kim ◽  
Hyeongseob Hwang ◽  
In-Sik Cho
Keyword(s):  
Heat Treatment ◽  
Fatigue Life ◽  
Fatigue Strength ◽  
Fatigue Limit ◽  
Shot Peening ◽  
High Cycle Fatigue ◽  
Landing Gear ◽  
Cycle Fatigue ◽  
Heat Treated ◽  
Ultrasonic Fatigue

In this study, the effect of baking heat treatment on fatigue strength and fatigue life was evaluated by performing baking heat treatment after shot peening treatment on 4340M steel for landing gear. An ultrasonic fatigue test was performed to obtain the S–N curve, and the fatigue strength and fatigue life were compared. The micro hardness of shot peening showed a maximum at a hardened depth of about 50 μm and was almost uniform when it arrived at the hardened depth of about 400 μm. The overall average tensile strength after the baking heat treatment was lowered by about 80–111 MPa, but the yield strength was improved by about 206–262 MPa. The five cases of specimens showed similar fatigue strength and fatigue life in high cycle fatigue (HCF) regime. However, the fatigue limit of the baking heat treated specimens showed an increasing tendency rather than that of shot peening specimens when the fatigue life was extended to the very high cycle fatigue (VHCF) regime. The effect of baking heat treatment was identified from improved fatigue limit when baking heat was used to treat the specimen treated by shot peening containing inclusions. The optimum temperature range for the better baking heat treatment effect could be constrained not to exceed maximum 246 °C.

Effect of shot-peening and low-plasticity burnishing on the high-cycle fatigue strength of DIN 34CrNiMo6 alloy steel

2019 ◽  
Vol 119 ◽  
pp. 338-354 ◽  
Author(s):  
Alexander Avilés ◽  
Rafael Avilés ◽  
Joseba Albizuri ◽  
Luis Pallarés-Santasmartas ◽  
Adrián Rodríguez
Keyword(s):  
Fatigue Strength ◽  
Alloy Steel ◽  
Shot Peening ◽  
High Cycle Fatigue ◽  
Cycle Fatigue ◽  
Low Plasticity Burnishing

scholarly journals Fatigue limit analysis of shot peened spring steel

2021 ◽  
Author(s):  
NohJun Myung ◽  
Liang Wang ◽  
Nak-Sam Choi
Keyword(s):  
Fatigue Strength ◽  
Fatigue Limit ◽  
Shot Peening ◽  
High Cycle Fatigue ◽  
High Strength ◽  
Spring Steel ◽  
Cycle Fatigue ◽  
Positive Effects ◽  
Fracturing Process ◽  
Fish Eye

This paper investigated the effect of shot-peening on fatigue strength of spring steel for the high cycle fatigue (HCF) and very high cycle fatigue (VHCF) to clarify the fatigue limit behavior of high strength spring steel during service life. Hourglass shape specimens made of spring steel (Si-Cr alloys) were prepared for the rotary bending fatigue test. Actual local stresses were quantitatively calculated to compensate for the stress amplitudes, through which it was clarified that the shot-peening had strongly positive effects on the HCF strength, but rather negative effect on the VHCF strength. The fish-eye fracturing process confirmed that most fish-eye fractures arose at sites deeper than the compressive residual stress zone, which did not prevent the creation of the fish-eye, and the fatigue strength improvement in the VHCF range could scarcely be shown as a result of the shot-peening treatment.

Ultra-Long Life Fatigue Behavior of Welded Joints with Shot Blast Treatment

2013 ◽  
Vol 275-277 ◽  
pp. 179-183 ◽  
Author(s):  
Chao He ◽  
Yong Jie Liu ◽  
Qing Yuan Wang
Keyword(s):  
Fatigue Strength ◽  
Welded Joints ◽  
Shot Peening ◽  
High Cycle Fatigue ◽  
Base Material ◽  
Ambient Air ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Base Steel ◽  
Long Life

In order to investigate the ultra-long life fatigue properties of welded joints, ultrasonic fatigue tests of base material and welded joints were carried out using Q345q steel in ambient air at room temperature with a stress ratio R=-1. The results showed that the fatigue strength of specimens with welded joints dropped about 60% compared with that of base steel. To improve the fatigue properties of welded joints, two groups of specimens were treated by shot peening with different degrees which produced different compressive residual stresses on samples. It was found that the shot peening treatment could improve the fatigue strength of welded joints obviously. The fatigue fracture surface was analyzed by scanning electron microscopy. The fractography showed that there were two kinds of crack initiation mechanism in the Q345q base steel, crack inition from defects on the surface for high cycle fatigue failure and in the interior of the sample in very high cycle fatigue range. However, almost all cracks of welded joints initiated from defects caused by welding process. The failure of welded joints usually happened at the section of welded toes in the area of fusion or geometric discontinuity.

scholarly journals On the determination of the bending fatigue strength in and above the very high cycle fatigue regime of shot-peened gears

2021 ◽  
Author(s):  
D. Fuchs ◽  
S. Schurer ◽  
T. Tobie ◽  
K. Stahl
Keyword(s):  
Fatigue Strength ◽  
High Cycle Fatigue ◽  
Load Carrying Capacity ◽  
Cycle Fatigue ◽  
Bending Fatigue ◽  
Very High Cycle Fatigue ◽  
Bending Load ◽  
Load Carrying ◽  
Bending Fatigue Strength ◽  
Very High

AbstractDemands on modern gearboxes are constantly increasing, for example to comply with lightweight design goals or new CO2 thresholds. Normally, to increase performance requires making gearboxes and powertrains more robust. However, this increases the weight of a standard gearbox. The two trends therefore seem contradictory. To satisfy both of these goals, gears in gearboxes can be shot-peened to introduce high compressive residual stresses and improve their bending fatigue strength. To determine a gear’s tooth root bending fatigue strength, experiments are conducted up to a defined number of load cycles in the high cycle fatigue range. However, investigations of shot-peened gears have revealed tooth root fracture damage initiated at non-metallic inclusions in and above the very high cycle fatigue range. This means that a further reduction in bending load carrying capacity has to be expected at higher load cycles, something which is not covered under current standard testing conditions. The question is whether there is a significant decrease in the bending load carrying capacity and, also, if pulsating tests conducted at higher load cycles—or even tests on the FZG back-to-back test rig—are necessary to determine a proper endurance fatigue limit for shot-peened gears. This paper examines these questions.

Corrigendum to “Abnormal twinning behaviors in ZK60 alloy by powder metallurgy process” [Mater. Sci. Eng., A 779 (2020) 139145]

2021 ◽  
Vol 805 ◽  
pp. 140799
Author(s):  
Lei Zhao ◽  
Mengna Zhang ◽  
Zihan Yu ◽  
Guojun Ma ◽  
Bin Ma ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Powder Metallurgy Process ◽  
Zk60 Alloy ◽  
Metallurgy Process
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