Influence of equal channel angular pressing on high cycle fatigue behavior of ultrafine-grained iron: Role of anisotropy

2018 ◽  
Vol 711 ◽  
pp. 650-658 ◽  
Author(s):  
Enrico Bruder ◽  
Chandanraj Gangaraju ◽  
Rimma Lapovok
Keyword(s):  
Equal Channel Angular Pressing ◽  
High Cycle Fatigue ◽  
Fatigue Behavior ◽  
Cycle Fatigue ◽  
Angular Pressing ◽  
Ultrafine Grained

High cycle fatigue behavior of Al1070 alloy severely deformed by equal channel angular pressing process

2016 ◽  
Vol 232 (6) ◽  
pp. 514-519 ◽  
Author(s):  
Mohammad Bagher Limooei ◽  
Morteza Zandrahimi ◽  
Ramin Ebrahimi
Keyword(s):  
Fatigue Life ◽  
Fatigue Strength ◽  
Equal Channel Angular Pressing ◽  
High Cycle Fatigue ◽  
Fatigue Behavior ◽  
Pure Aluminum ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Angular Pressing ◽  
Pressing Process

In the present work, equal channel angular pressing of commercial pure aluminum 1070 was performed up to 4 passes using route Bc. For equal channel angular pressing operation, a suitable die set was designed and manufactured. X-ray diffraction analysis was used to determine the microstructure of the equal channel angular pressing-ed material. The fracture surface morphology and microstructure after fatigue were investigated by scanning electron microscopy. Mechanical properties of the equal channel angular pressing-ed material were evaluated by hardness and tension tests. Also, cyclic deformation behavior of severe plastic deformation Al1070 has been studied and results show a significant variation in hardness, ultimate strength and fatigue properties in high cycle fatigue life. Coefficient of fatigue strength σ′f and Bridgman correction factor have been obtained by S-N curve and tension test specimens, respectively, and compared before and after equal channel angular pressing process. Also an useful relation has been derived between fatigue life ( Nf) and stress amplitude ( σa) in high cycle fatigue region. Results indicated that there was not clear relation between fatigue strength coefficient and true corrected fracture stress in this case.

Effect of Trace Impurities on High-Cycle Fatigue Damage of Ultrafine Grained Copper Processed by Equal Channel Angular Pressing

2008 ◽  
Vol 584-586 ◽  
pp. 809-814
Author(s):  
Masahiro Goto ◽  
N. Teshima ◽  
Seung Zeon Han ◽  
T. Yakushiji ◽  
Sang Shik Kim
Keyword(s):  
Equal Channel Angular Pressing ◽  
Fatigue Damage ◽  
High Cycle Fatigue ◽  
Surface Damage ◽  
Cycle Fatigue ◽  
Trace Impurities ◽  
Angular Pressing ◽  
Ultrafine Grained ◽  
Two Samples ◽  
Formation Behavior

In order to study the effect of trace impurities on high-cycle fatigue damage of ultrafine grained (UFG) copper, fatigue tests were carried out for two samples: oxygen-free copper (OFC, 99.99 wt% Cu) and deoxidized low-phosphorous copper (DLP, 99.95 wt% Cu). After the processing by equal channel angular pressing (ECAP) using eight passes, equiaxed grains with an average size of 250 nm were formed for both the samples. Fatigue strength of UFG copper was enhanced by the impurities. The formation behavior of surface damage and the change in surface hardness was monitored. A close relationship was observed between the change in hardness and the formation behavior of surface damage. The physical background of the effect of trace impurities on the fatigue damage was discussed from the viewpoints of surface damage formation behavior.

scholarly journals Intrinsic high cycle fatigue behavior of ultrafine grained pure Cu with stable structure

2016 ◽  
Vol 59 (7) ◽  
pp. 531-537 ◽  
Author(s):  
Peng Xue ◽  
Zhiye Huang ◽  
Beibei Wang ◽  
Yanzhong Tian ◽  
Wenguang Wang ◽  
...  
Keyword(s):  
High Cycle Fatigue ◽  
Fatigue Behavior ◽  
Stable Structure ◽  
Cycle Fatigue ◽  
Ultrafine Grained ◽  
Pure Cu

Role of stress in the high cycle fatigue behavior of advanced 9Cr/CrMoV dissimilarly welded joint

2016 ◽  
Vol 31 (2) ◽  
pp. 292-301 ◽  
Author(s):  
Chendong Shao ◽  
Fenggui Lu ◽  
Zhuguo Li ◽  
Yan Cai ◽  
Peng Wang ◽  
...  
Keyword(s):  
High Cycle Fatigue ◽  
Welded Joint ◽  
Fatigue Behavior ◽  
Cycle Fatigue ◽  
Image Position

Abstract

Relationship between Grain Growth and Formation of Fracture Surface of Ultrafine Grained Cu in High-Cycle Fatigue

2016 ◽  
Vol 713 ◽  
pp. 147-150
Author(s):  
M. Goto ◽  
Seung Zeon Han ◽  
Takaei Yamamoto ◽  
J. Kitamura ◽  
Kamil Kusno ◽  
...  
Keyword(s):  
Fracture Surface ◽  
High Cycle Fatigue ◽  
Crack Tip ◽  
Plastic Zone Size ◽  
Fatigue Tests ◽  
Growth Behavior ◽  
Cycle Fatigue ◽  
Zone Size ◽  
Angular Pressing ◽  
Ultrafine Grained

Fatigue tests were conducted on specimens of ultrafine grained copper produced by equal channel angular pressing. The growth behavior of a fatal crack was monitored successively. The morphological features of the crack growth paths and fracture surfaces were influenced by variation of grain size and damaged areas of the crack tip, depending on the stage of progress of the fatigue damage. The change in fracture surface was discussed by considering the interrelation between the reversible plastic zone size at the crack tip and the microstructure evolved during cyclic stressing.

Sign in / Sign up

Export Citation Format

Share Document