The influence of building direction on the fatigue crack propagation behavior of Ti6Al4V alloy produced by selective laser melting

2019 ◽  
Vol 767 ◽  
pp. 138409 ◽  
Author(s):  
Z.W. Xu ◽  
A. Liu ◽  
X.S. Wang
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Selective Laser Melting ◽  
Fatigue Crack Propagation ◽  
Ti6al4v Alloy ◽  
Laser Melting ◽  
Fatigue Crack Propagation Behavior ◽  
Propagation Behavior ◽  
Crack Propagation Behavior

scholarly journals On the Dwell-Fatigue Crack Propagation Behavior of a High-Strength Ni-Base Superalloy Manufactured by Selective Laser Melting

2019 ◽  
Vol 51 (2) ◽  
pp. 962-972 ◽  
Author(s):  
Dunyong Deng ◽  
Robert Eriksson ◽  
Ru Lin Peng ◽  
Johan Moverare
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Selective Laser Melting ◽  
Fatigue Crack Propagation ◽  
Fatigue Cracking ◽  
Laser Melting ◽  
Fatigue Crack Propagation Behavior ◽  
Propagation Behavior ◽  
Dwell Fatigue ◽  
Crack Propagation Behavior

AbstractThis study focuses on the dwell-fatigue crack propagation behavior of IN718 manufactured via selective laser melting (SLM). The dwell-fatigue test condition is 823 K (550 $$^{\circ }$$∘C) with a long 2160-s dwell-holding period. Effects of heat treatment and loading direction on dwell-fatigue crack propagation rates are studied. A grain boundary $$\delta $$δ precipitate seems to be slightly beneficial to the dwell-fatigue cracking resistance of SLM IN718. A comparison has been made between SLM IN718 and forged counterparts at different temperatures, indicating that a creep damage mechanism is likely dominant for SLM IN718 under the present test condition. A general discussion of the inferior creep resistance of SLM IN718 is also included. The anisotropic dwell-fatigue cracking resistance has also been studied and rationalized with the effective stress intensity factor calculated from finite element modeling.

Effect of Biaxial Static Loads on Fatigue Crack Propagation Behavior under Cyclic Tensile and Torsional Loading

2006 ◽  
Vol 321-323 ◽  
pp. 720-723
Author(s):  
Yong Hak Huh ◽  
Philip Park ◽  
Dong Jin Kim ◽  
Jun Hyub Park
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Growth Rates ◽  
Biaxial Loading ◽  
Torsional Loading ◽  
Static Loads ◽  
Fatigue Crack Propagation Behavior ◽  
Propagation Behavior ◽  
Crack Propagation Behavior

Fatigue crack propagation behavior under cyclic tensile or torsional loading with biaxial static loads has been investigated. Two different biaxial loading systems, i.e. cyclic tensile loading with static torsional load and cyclic torsional loading with static tensile load, were employed to thin-walled tubular specimens. The crack propagation was measured by two crack gages mounted near the notch and crack opening level was measured by unloading compliance method. The directions of the fatigue crack propagated under respective biaxial loading conditions were examined and the growth rates were evaluated by using several cyclic parameters, including equivalent stress intensity factor range, Keff, crack tip opening displacement range, CTD, minimum strain energy density factor range, Smin. Furthermore, the growth rates were evaluated by effective cyclic parameters considering crack closure. It was found that the biaxial static stress superimposed on the cyclic tensile or torsional loading tests has no influence on the propagation directions of the cracks. Furthermore, it was shown that the fatigue crack growth rates under biaixial faigue loading were well expressed by using the cyclic fatigue parameters, Keq,eff, CTDeff, Smin,eff considering crack closure effect.

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