scholarly journals Ultrasonic Fatigue Strength in Inconel 718

2001 ◽  
Author(s):  
Q. Chen ◽  
N. Kawagoishi ◽  
K. Othubo ◽  
E. Kondo ◽  
M. Sakai ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Inconel 718 ◽  
Ultrasonic Fatigue

scholarly journals Microstructural Characterization Of Laser Heat Treated AISI 4140 Steel With Improved Fatigue Behavior

2015 ◽  
Vol 60 (2) ◽  
pp. 1331-1334 ◽  
Author(s):  
M.C. Oh ◽  
H. Yeom ◽  
Y. Jeon ◽  
B. Ahn
Keyword(s):  
Fatigue Strength ◽  
Alloy Steel ◽  
Microstructural Evolution ◽  
Fatigue Behavior ◽  
Microstructural Characterization ◽  
Optical Microscope ◽  
Heat Treated ◽  
Aisi 4140 ◽  
Ultrasonic Fatigue

Abstract The influence of surface heat treatment using laser radiation on the fatigue strength and corresponding microstructural evolution of AISI 4140 alloy steel was investigated in this research. The AISI 4140 alloy steel was radiated by a diode laser to give surface temperatures in the range between 600 and 800°C, and subsequently underwent vibration peening. The fatigue behavior of surface-treated specimens was examined using a giga-cycle ultrasonic fatigue test, and it was compared with that of non-treated and only-peened specimens. Fatigue fractured surfaces and microstructural evolution with respect to the laser treatment temperatures were investigated using an optical microscope. Hardness distribution was measured using Vickers micro-hardness. Higher laser temperature resulted in higher fatigue strength, attributed to the phase transformation.

Ultrasonic fatigue strength of Al alloys

2002 ◽  
Vol 2002 (0) ◽  
pp. 575-576
Author(s):  
Qiang CHEN ◽  
Nu YAN ◽  
Norio KAWAGOISHI ◽  
Eiji KONDO ◽  
Qing yauan WANG
Keyword(s):  
Fatigue Strength ◽  
Al Alloys ◽  
Ultrasonic Fatigue

117 Effect of microstructure on ultrasonic fatigue properties of Inconel 718

2007 ◽  
Vol 2007 (0) ◽  
pp. 33-34
Author(s):  
Eiji MAEMURA ◽  
Norio KAWAGOISHI ◽  
Qiang CHEN ◽  
Masahiro GOTO ◽  
Kazuhiro MORINO
Keyword(s):  
Inconel 718 ◽  
Fatigue Properties ◽  
Ultrasonic Fatigue ◽  
Effect Of Microstructure

Evaluation of Fatigue Strength by Ultrasonic Fatigue Testing

2003 ◽  
Vol 2003.52 (0) ◽  
pp. 273-274
Author(s):  
Shigehito NISHIMURA ◽  
Akitoshi MATSUO ◽  
Noboru EGAMI ◽  
Hirohisa KIMACHI
Keyword(s):  
Fatigue Strength ◽  
Fatigue Testing ◽  
Ultrasonic Fatigue

Ultrasonic Fatigue Performance of Welded Joints in 16Mn Steel

2012 ◽  
Vol 251 ◽  
pp. 392-396
Author(s):  
Liang Chen Wu ◽  
Dong Po Wang
Keyword(s):  
Fatigue Strength ◽  
Welded Joints ◽  
Performance Test ◽  
Test System ◽  
Fatigue Performance ◽  
Traditional Concept ◽  
Welded Structure ◽  
Ultrasonic Fatigue ◽  
Long Life ◽  
16Mn Steel

Ultrasonic fatigue performance test of 16Mn steel and welded joints are carried out by using ultrasonic fatigue test system devices developed by Tianjin University to research its fatigue behavior in the super long life regime. The results show that: regardless of the base mental or welded joints, the S-N curve is a continuous decline curve; Welded joints does not exist the traditional concept of fatigue limit within the range of 106~107, when the number of load cycles exceeds 107 even 109, fatigue fracture still occurs. Within the super long life range, the fatigue strength of welded joint is much lower than the fatigue strength of base mental. It is dangerous to use the existing fatigue data to design the welded structure within the super long life regime.

scholarly journals Very High Cycle Fatigue Investigations on the Fatigue Strength of Additive Manufactured and Conventionally Wrought Inconel 718 at 873 K

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1682
Author(s):  
Alexander Schmiedel ◽  
Christina Burkhardt ◽  
Sebastian Henkel ◽  
Anja Weidner ◽  
Horst Biermann
Keyword(s):  
Crack Initiation ◽  
Inconel 718 ◽  
High Cycle Fatigue ◽  
Fatigue Testing ◽  
Reference Conditions ◽  
Cycle Fatigue ◽  
Very High Cycle Fatigue ◽  
Ultrasonic Fatigue ◽  
Fine Grained Structure ◽  
Very High

The fatigue lives of additively manufactured (AM) Inconel 718 (IN718) produced by selective electron beam melting and conventional wrought material as reference conditions were studied in the very high cycle fatigue regime under fully reversed loading (R = −1) at the elevated temperature of 873 K using an ultrasonic fatigue testing system. The fatigue lives of the AM material were significantly reduced compared to the wrought material, which is discussed in relation to the microstructure and a fractographical analysis. The additively manufactured material showed large columnar grains with a favoured orientation to the building direction and porosity, whereas the wrought material showed a fine-grained structure with no significant texture, but had Nb- and Ti-rich non-metallic inclusions. Crystallographic crack initiation as well as crack initiation from the surface or internal defects were observed for the AM and the wrought IN718, respectively.

Giga-Cycle Property of a New Age-Hardened Aluminium Alloy Containing Excess Solute Magnesium

2013 ◽  
Vol 577-578 ◽  
pp. 293-296
Author(s):  
Yoshimasa Takahashi ◽  
Hiroaki Yoshitake ◽  
Takahiro Shikama ◽  
Hiroshi Noguchi ◽  
Masanori Takuma
Keyword(s):  
Fatigue Strength ◽  
Strength Properties ◽  
Al Alloy ◽  
Ultrasonic Fatigue ◽  
Excess Mg ◽  
Number Of Cycles ◽  
Amplitude Level ◽  
Alloy 6061 ◽  
Total Life ◽  
Cycle Property

The giga-cycle property of a newly developed Al alloy, which contains 0.5wt.% excess Mg solute compared to a standard age-hardened 6061 alloy (6061-T6), was investigated by using smooth specimens subjected to ultrasonic fatigue. The fatigue strength of the new alloy was higher than that of a normal 6061 alloy particularly at relatively low stress amplitude level. Several analyses (surface crack observation, fractography, FIB cross-sectioning, etc.) were also conducted to reveal the micro-mechanism of the observed strength properties. The following results were obtained: i) No fatigue limit was confirmed for both 6061 and new alloy. ii) Total life (Nf) of 6061 and new alloys was determined by a single fatigue crack initiated from a surface PSB crack. iii) Crack initiation resistance defined by N25 (number of cycles to reach ρ = 25 mm-2, where ρ is the PSB crack number density) for new alloy was higher than that of 6061. iv) The higher fatigue strength of new alloy was explained by the effect of excess Mg solute which increased the resistance against the formation of PSB cracks.

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