Effect of plasma nitriding on high‐cycle fatigue properties and fracture behaviors of GJS700 nodular cast iron under cyclic bending loading

2021 ◽  
Author(s):  
Mohammad Sadegh Aghareb Parast ◽  
Mohammad Jamalkhani Khameneh ◽  
Mohammad Azadi ◽  
Mahboobeh Azadi ◽  
Mohammad Hadi Mahdipanah ◽  
...  
Keyword(s):  
Cast Iron ◽  
High Cycle Fatigue ◽  
Plasma Nitriding ◽  
Nodular Cast Iron ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Cyclic Bending ◽  
Fracture Behaviors ◽  
Bending Loading

Effect of Plasma Nitriding on Ultra-High Cycle Fatigue Behaviors of Ti-6Al-4V

2011 ◽  
Vol 295-297 ◽  
pp. 2386-2389 ◽  
Author(s):  
Ren Hui Tian ◽  
Qiao Lin Ouyang ◽  
Qing Yuan Wang
Keyword(s):  
High Cycle Fatigue ◽  
Plasma Nitriding ◽  
Fatigue Behavior ◽  
Fatigue Crack Initiation ◽  
Fatigue Tests ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Ultrasonic Fatigue ◽  
Ultra High Cycle Fatigue ◽  
Stress Ratios

In order to investigate the effect of plasma nitriding treatment on fatigue behavior of titanium alloys, very high cycle fatigue tests were carried out for Ti-6Al-4V alloy using an ultrasonic fatigue machine under load control conditions for stress ratios of R=-1 at frequency of ƒ=20KHz. Experiment results showed that plasma nitriding treatment played the principal role in the internal fatigue crack initiation. More importantly, plasma nitriding treatment had a detrimental effect on fatigue properties of the investigated Ti-6Al-4V alloy, and the fatigue strength of material after plasma nitriding treatment appeared to be significantly reduced about 17% over the untreated material.

scholarly journals Study on High-Cycle Fatigue Behaviors and Fracture Mechanism of RuT450

2020 ◽  
Author(s):  
MengXiao Zhang ◽  
JianChao Pang ◽  
Meng Lingjian ◽  
Li Shouxin ◽  
Liu Qingyi ◽  
...  
Keyword(s):  
Cast Iron ◽  
Fatigue Strength ◽  
High Cycle Fatigue ◽  
Prediction Method ◽  
Threshold Value ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Graphite Phase ◽  
Graphite Cast Iron ◽  
Different Temperatures

Fatigue failure is the most common failure mode of structural materials. In this study, the high-cycle fatigue properties at different temperatures, fracture surface morphologies and corresponding damage mechanisms of a widely used vermicular graphite cast iron RuT450 were investigated. It is found that the fatigue strength of RuT450 decreases with the increase of temperature, and the decreasing rate is affected by the change of morphology and content of graphite. In general, the cracks initiated from the graphite phase boundary and propagated through the pearlite lamellae. In addition, according to the change of matrix micro-structure and the slight change of graphite morphology at different temperatures, and combined with the change of crack propagation threshold value under different temperature conditions, a fatigue strength prediction method for vermicular graphite cast iron at different temperatures was proposed in this work, which has high prediction accuracy.

scholarly journals Reliability prediction, scatter-band analysis and fatigue limit assessment of high-cycle fatigue properties in EN-GJS700-2 ductile cast iron

2018 ◽  
Vol 165 ◽  
pp. 10012 ◽  
Author(s):  
Mohammad Jamalkhani Khameneh ◽  
Mohammad Azadi
Keyword(s):  
Cast Iron ◽  
Fatigue Limit ◽  
High Cycle Fatigue ◽  
Likelihood Estimation ◽  
Ductile Cast Iron ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Test Methodology ◽  
Standard Specimens ◽  
Statistical Trends

In this article, high-cycle fatigue properties of the EN-GJS700-2 ductile cast iron were experimentally examined, using the four-point rotary-bending fatigue machine. Such material has been widely utilized for manufacturing crankshafts in automotive industries. Therefore, standard specimens were extracted from the crankshaft to consider the manufacturing effect. The other aim of this work is to develop a model, anticipating the probabilistic behavior of the EN-GJS700-2 ductile cast iron. For such objective, the parametric analysis of the most commonly used statistical distributions were performed and compared. Based on the best fitted distribution function on experimental data, fatigue lifetime reliability specifications of the material were analyzed and represented through probabilistic modeling. In addition, the S-N diagram with its scatter-band were conducted at different values of the confidence level. As another investigation, the criterion for designing the crankshaft is the infinite lifetime, or in more practical terms, is the design with allowable stress levels, below the fatigue limit. Based on the staircase test methodology, fatigue endurance limit tests were conducted. Then, statistical trends of the fatigue limit were analyzed by the Dixon-Mood method, based on the maximum likelihood estimation. Obtained results represents that the fatigue limit was 211 MPa for the ductile cast iron.

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