scholarly journals Gigacycle Fatigue Properties Evaluation for Martensitic Stainless Steels by Using Ultrasonic Fatigue Tests (Study for Materials with Different Level of Inclusion Size)

2004 ◽  
Vol 70 (696) ◽  
pp. 1080-1086 ◽  
Author(s):  
Nobuyuki MIYAMOTO ◽  
Hiromitsu ASAI ◽  
Susumu MIYAKAWA ◽  
Yoshiaki AKINIWA ◽  
Keisuke TANAKA
Keyword(s):  
Stainless Steels ◽  
Inclusion Size ◽  
Fatigue Tests ◽  
Fatigue Properties ◽  
Martensitic Stainless Steels ◽  
Ultrasonic Fatigue

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.

Thermal Fatigue Characteristics of Heat-Resisting Stainless Steel for Automotive Exhaust

2007 ◽  
Vol 539-543 ◽  
pp. 4944-4949 ◽  
Author(s):  
Tae Kwon Ha ◽  
Hwan Jin Sung
Keyword(s):  
Thermal Fatigue ◽  
Stainless Steels ◽  
Fatigue Property ◽  
Fatigue Tests ◽  
Fatigue Properties ◽  
Automotive Exhaust ◽  
Load Relaxation ◽  
Temperature Ranges ◽  
Fatigue Characteristics ◽  
Efficiency And Reliability

Thermal fatigue is a complex phenomenon encountered in materials exposed to cyclically varying temperatures in the presence or absence of external load. Continually increasing working temperature and growing need for greater efficiency and reliability of automotive exhaust require immediate investigation into the thermal fatigue properties especially of high temperature stainless steels. In this study, thermal fatigue properties of 304 and 429EM stainless steels have been evaluated in the temperature ranges of 200-800oC and 200-900oC. Systematic methods for control of temperatures within the predetermined range and measurement of load applied to specimens as a function of temperature during thermal cycles have been established. Thermal fatigue tests were conducted under fully constrained condition, where both ends of specimens were completely fixed. Thermal fatigue property of STS 304 was superior to that of STS 429EM. Load relaxation behavior at the temperatures of thermal cycle was closely related with the thermal fatigue property.

scholarly journals The Fatigue Behavior and Mechanism of Large FV520B-I Specimens in a Very High Cycle Regime

2021 ◽  
Author(s):  
Han Zhang ◽  
Ming Zhang ◽  
Li Meng Li ◽  
Bao Hai Xie ◽  
Jun Li Zhang
Keyword(s):  
Fatigue Life ◽  
Fatigue Behavior ◽  
Fatigue Crack Initiation ◽  
Inclusion Size ◽  
Fatigue Properties ◽  
Corrosion Fatigue Crack ◽  
Life Model ◽  
Specimen Test ◽  
Ultrasonic Fatigue ◽  
Very High

Abstract We examined the fatigue properties in very high cycle regime of large FV520B-I specimens in an ultrasonic fatigue test. The fatigue mechanism in very high cycle regime didn’t change and the fatigue properties obviously degraded as the specimen size enlarged. The fatigue life decreased and the S-N curve moved downward due to the increase of inclusion size in large specimens. The maximum inclusion sizes in specimens were predicted by the method of statistics of extreme value. The prediction of fatigue strength using the modified Murakami model was closer to the test result, and the fitting of fatigue life using the corrosion fatigue crack initiation life model was less effective compared with the fitting of small specimen test results

Fatigue Properties of Austenitic Stainless Steels with Different Nitrogen

2004 ◽  
Vol 261-263 ◽  
pp. 1215-1220 ◽  
Author(s):  
Nobusuke Hattori ◽  
S. Nishida
Keyword(s):  
Fatigue Strength ◽  
Stainless Steels ◽  
Stress Amplitude ◽  
Austenitic Stainless Steels ◽  
Fatigue Tests ◽  
The Other ◽  
Fatigue Properties ◽  
Transformation Ratio ◽  
Other Hand ◽  
Knee Point

The fatigue properties of austenitic stainless steels become inevitably important when using in structural materials. The authors have performed fatigue tests to investigate the effect of nitrogen content on fatigue properties of typical austenitic stainless steels (SUS304) and two kinds of nitrogen-contained SUS304 (SUS304N and YUS170). The main results obtained in this study are as follows; (1) The knee point in S-N curves exists for SUS304 and SUS304N, but does not exist for YUS170. (2) The fatigue limit of SUS304N is higher than that of SUS304. On the other hand, the fatigue strength by 107 cycles of YUS170 is lower than those of SUS304 and SUS304N. (3) For SUS304, the transformation ratio increases with increase in stress amplitude. On the other hand, the transformation ratio of SUS304N is very small and that of YUS170 remains essentially zero.

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