scholarly journals Effect of oxidation on high-temperature, high-cycle fatigue behaviour of engineering steels.

1990 ◽  
Vol 39 (437) ◽  
pp. 175-180
Author(s):  
Kenji KANAZAWA ◽  
Morio SATO ◽  
Megumi KIMURA
Keyword(s):  
High Temperature ◽  
High Cycle Fatigue ◽  
Fatigue Behaviour ◽  
Cycle Fatigue

scholarly journals Characterization and modelling of both high-cycle hightemperature fatigue behaviour of Stainless Steel Grades

2018 ◽  
Vol 165 ◽  
pp. 19008
Author(s):  
Pierre-Olivier Santacreu ◽  
Cloé Prudhomme ◽  
Benoit Proult ◽  
Isabelle Evenepoel
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
High Temperatures ◽  
High Cycle Fatigue ◽  
Fatigue Cracks ◽  
Fatigue Behaviour ◽  
Cycle Fatigue ◽  
Vibration Fatigue ◽  
Steel Grades ◽  
Stress Ratios

In the same context of thermo-mechanical fatigue and high temperature applications of stainless steel, high-frequency vibration fatigue at high temperatures should be considered, in particular for automotive exhaust gas applications. In fact one of the most frequent incidents that can happen on exhaust components is an accumulation of low-cycle thermal fatigue and high-cycle fatigue. The prediction of the lifetime of a structure under such complex thermal and mechanical loading is therefore a constant challenge at high temperature due to the coupling of metallurgical, oxidation or creep effects. In order to better understand in a first approach, the high cycle fatigue of stainless steels at high temperatures, tractioncompression tests were performed on flat specimens at 25Hz, under air and in isothermal conditions from ambient temperature to 850°C. Two different stress ratios, R=-1 and 0.1, are characterized with the objective to assess a multiaxial model for high temperature. Different criteria are used to predict the ruin of a structure under high-cycle fatigue but in general for ambient-around temperatures. In particular, multiaxial and stress-based DangVan criterion is today widely used to evaluate the risk of fatigue cracks initiation and it has been implemented recently in our fatigue life processor Xhaust_Life®. Therefore the Dang Van criterion was identified from the isothermal high cycle fatigue using the 2 stress ratio and its validity is discussed especially for temperatures higher than 500°C where strain rate and creep effects have increasing influence. Results are presented for two ferritic stainless steel grades used in high temperature exhaust applications: K41X (AISI 441, EN 1.4509) and K44X (AISI 444Nb, EN 1.4521).

scholarly journals Effect of Microstructure on High Temperature High-cycle Fatigue Properties in a Ni-base Superalloy

1983 ◽  
Vol 69 (1) ◽  
pp. 107-116
Author(s):  
Masaru YAMAMOTO ◽  
Yuhji OOTSUKA ◽  
Ohmi MIYAGAWA ◽  
Dai FUJISHIRO
Keyword(s):  
High Temperature ◽  
High Cycle Fatigue ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Base Superalloy ◽  
Effect Of Microstructure

scholarly journals Effect of Sandblasting on Low and High-Cycle Fatigue Behaviour after Mechanical Cutting of a Twinning-Induced Plasticity Steel

2018 ◽  
Vol 165 ◽  
pp. 18002
Author(s):  
Antoni Lara ◽  
Mercè Roca ◽  
Sergi Parareda ◽  
Núria Cuadrado ◽  
Jessica Calvo ◽  
...  
Keyword(s):  
High Cycle Fatigue ◽  
Twip Steel ◽  
Low Cycle Fatigue ◽  
Load Ratio ◽  
Fatigue Behaviour ◽  
Cycle Fatigue ◽  
High Manganese ◽  
Amplitude Control ◽  
Cut Edge ◽  
Mechanical Cutting

In the last years, car bodies are increasingly made with new advanced high-strength steels, for both lightweighting and safety purposes. Among these new steels, high-manganese or TWIP steels exhibit a promising combination of strength and toughness, arising from the austenitic structure, strengthened by C, and from the twinning induced plasticity effect. Mechanical cutting such as punching or shearing is widely used for the manufacturing of car body components. This method is known to bring about a very clear plastic deformation and therefore causes a significant increase of mechanical stress and micro-hardness in the zone adjacent to the cut edge. To improve the cut edge quality, surface treatments, such as sandblasting, are often used. This surface treatment generates a compressive residual stress layer in the subsurface region. The monotonic tensile properties and deformation mechanisms of these steels have been extensively studied, as well as the effect of grain size and distribution and chemical composition on fatigue behaviour; however, there is not so much documentation about the fatigue performance of these steels cut using different strategies. Thus, the aim of this work is to analyse the fatigue behaviour of a TWIP steel after mechanical cutting with and without sandblasting in Low and High-Cycle Fatigue regimes. The fatigue behaviour has been determined at room temperature with tensile samples tested with a load ratio of 0.1 and load amplitude control to analyse High-Cycle Fatigue behaviour; and a load ratio of -1 and strain amplitude control to determine the Low-Cycle Fatigue behaviour. Samples were cut by shearing with a clearance value of 5%. Afterwards, a part of the cut specimens were manually blasted using glass microspheres of 40 to 95 microns of diameter as abrasive media. The results show a beneficial effect of the sandblasting process in fatigue behaviour in both regimes, load amplitude control (HCF) and strain amplitude control (LCF) tests, when these magnitudes are low, while no significant differences are observed with higher amplitudes. low-cycle fatigue, high-cycle fatigue, mechanical cutting, sandblasting, high manganese steel, TWIP steel

scholarly journals Influence of defects on the very high cycle fatigue behaviour of forged aeronautic titanium alloy

2014 ◽  
Vol 12 ◽  
pp. 10004
Author(s):  
Alexander Nikitin ◽  
Thierry Palin-Luc ◽  
Andrey Shanyavskiy ◽  
Claude Bathias
Keyword(s):  
Titanium Alloy ◽  
High Cycle Fatigue ◽  
Fatigue Behaviour ◽  
Cycle Fatigue ◽  
Very High Cycle Fatigue ◽  
Very High
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