scholarly journals Very High Cycle Fatigue Resistance of the Low Alloyed Steel 42CrMo4 in Medium- and High-Strength Quenched and Tempered Condition

2016 ◽  
Vol 2 ◽  
pp. 1133-1142 ◽  
Author(s):  
K.-H. Lang ◽  
M. Korn ◽  
T. Rohm
Keyword(s):  
Fatigue Resistance ◽  
High Cycle Fatigue ◽  
High Strength ◽  
Alloyed Steel ◽  
Cycle Fatigue ◽  
Very High Cycle Fatigue ◽  
Low Alloyed Steel ◽  
Very High

scholarly journals Very-High-Cycle Fatigue Behavior of Inconel 718 Alloy Fabricated by Selective Laser Melting at Elevated Temperature

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1001
Author(s):  
Zongxian Song ◽  
Wenbin Gao ◽  
Dongpo Wang ◽  
Zhisheng Wu ◽  
Meifang Yan ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Selective Laser Melting ◽  
Fatigue Resistance ◽  
Inconel 718 ◽  
High Cycle Fatigue ◽  
Cycle Fatigue ◽  
Laser Melting ◽  
Inconel 718 Alloy ◽  
Very High Cycle Fatigue ◽  
Very High

This study investigates the very-high-cycle fatigue (VHCF) behavior at elevated temperature (650 °C) of the Inconel 718 alloy fabricated by selective laser melting (SLM). The results are compared with those of the wrought alloy. Large columnar grain with a cellular structure in the grain interior and Laves/δ phases precipitated along the grain boundaries were exhibited in the SLM alloy, while fine equiaxed grains were present in the wrought alloy. The elevated temperature had a minor effect on the fatigue resistance in the regime below 108 cycles for the SLM alloy but significantly reduced the fatigue strength in the VHCF regime above 108 cycles. Both the SLM and wrought specimens exhibited similar fatigue resistance in the fatigue life regime of fewer than 107–108 cycles at elevated temperature, and the surface initiation mechanism was dominant in both alloys. In a VHCF regime above 107–108 cycles at elevated temperature, the wrought material exhibited slightly better fatigue resistance than the SLM alloy. All fatigue cracks are initiated from the internal defects or the microstructure discontinuities. The precipitation of Laves and δ phases is examined after fatigue tests at high temperatures, and the effect of microstructure on the formation and the propagation of the microstructural small cracks is also discussed.

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

scholarly journals Mechanisms of interior crack initiation in very-high-cycle fatigue of high-strength alloys

2019 ◽  
Vol 212 ◽  
pp. 153-163 ◽  
Author(s):  
Xiaolong Liu ◽  
Erqing Chen ◽  
Fan Zeng ◽  
Tao Cong ◽  
Joseph P. Domblesky
Keyword(s):  
Crack Initiation ◽  
High Cycle Fatigue ◽  
High Strength ◽  
Cycle Fatigue ◽  
Very High Cycle Fatigue ◽  
Very High
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