scholarly journals The Significance of Local Plasticity for the Crack Initiation Process During Very High Cycle Fatigue of High Strength Steels

2014 ◽  
Vol 3 ◽  
pp. 1353-1358 ◽  
Author(s):  
A. Giertler ◽  
M. Söker ◽  
B. Dönges ◽  
K. Istomin ◽  
W. Ludwig ◽  
...  
Keyword(s):  
Crack Initiation ◽  
High Cycle Fatigue ◽  
High Strength Steels ◽  
High Strength ◽  
Cycle Fatigue ◽  
Local Plasticity ◽  
Very High Cycle Fatigue ◽  
Initiation Process ◽  
Very High

scholarly journals The influence of tension mean stress to the crack initiation process at the very high cycle fatigue regime for a high strength steel

2018 ◽  
Vol 165 ◽  
pp. 20001
Author(s):  
Thomas Rohm ◽  
Karl-Heinz Lang ◽  
Marcus Korn
Keyword(s):  
Crack Initiation ◽  
High Strength Steel ◽  
High Cycle Fatigue ◽  
High Strength ◽  
Mean Stress ◽  
Cycle Fatigue ◽  
Very High Cycle Fatigue ◽  
Initiation Process ◽  
Incremental Step ◽  
Very High

Strain controlled tests were performed on a high strength steel to investigate the influence of tension mean stress to the crack initiation process at the very high cycle fatigue regime. It is supposed that the variation of stress the state in the vicinity of a non-metallic inclusion results in a change to the energy transferred to the surrounding metallic matrix. To prove this, incremental step tests on cylindrical specimen were realized in which the tension mean stress was stepwise increased. It could be verified that the hysteresis area, which is a criterion of the work transferred to the specimen, decreases with increasing tension mean stress. The test results provide a reasonable physical model to estimate the influence of tension mean stress to the crack initiation process in the very high cycle fatigue regime.

Study on Very High Cycle Fatigue Fracture of High Strength Steel with CFB/M Complex Microstructure

2010 ◽  
Vol 638-642 ◽  
pp. 3839-3845 ◽  
Author(s):  
Y. Yu ◽  
B.Z. Bai ◽  
Jia Lin Gu
Keyword(s):  
Crack Initiation ◽  
High Purity ◽  
High Cycle Fatigue ◽  
High Strength Steels ◽  
High Strength ◽  
Inclusion Size ◽  
Cycle Fatigue ◽  
Very High Cycle Fatigue ◽  
Very High ◽  
Production Conditions

The influence of production conditions and Nb microalloy on the very high cycle fatigue (VHCF) behaviors of different Carbide-free bainite/martensite (CFB/M) steels was studied, which include steels produced in laboratory and steelworks. Results show the Nb-microalloy can strengthen the microstructure including the soft bainite plate and improve the VHCF property evidently. In addition, the high purity of steels can avoid inclusion induced crack initiation, but can not improve the VHCF property unless the microstructure possesses favorable uniformity. The critical inclusion size is suggested to be 10-15μm and the CFB/M complex microstructure may be less sensitive to inclusions than other high strength steels.

On effect of hydrogen on very high cycle fatigue behaviours of high strength steels

2013 ◽  
Vol 29 (11) ◽  
pp. 1290-1296 ◽  
Author(s):  
J-B Shi ◽  
Y D Li ◽  
W M Guo ◽  
N Xu ◽  
X F Wu ◽  
...  
Keyword(s):  
High Cycle Fatigue ◽  
High Strength Steels ◽  
High Strength ◽  
Cycle Fatigue ◽  
Very High Cycle Fatigue ◽  
Very High
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