scholarly journals Influence of Laser Peening on the Fatigue Strength of 3D Additive Manufactured Maraging Steel

2021 ◽  
Vol 2021 (66) ◽  
pp. 7-12
Author(s):  
Shiori TSUCHIYA ◽  
Koji TAKAHASHI
Keyword(s):  
Fatigue Strength ◽  
Maraging Steel ◽  
Laser Peening

scholarly journals Improving Fatigue Limit and Rendering Defects Harmless through Laser Peening in Additive-Manufactured Maraging Steel

Metals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 49
Author(s):  
Shiori Tsuchiya ◽  
Koji Takahashi
Keyword(s):  
Residual Stress ◽  
Fatigue Strength ◽  
Fatigue Limit ◽  
Maraging Steel ◽  
Compressive Residual Stress ◽  
Surface Defects ◽  
Defect Size ◽  
Specimen Surface ◽  
Dominant Factor ◽  
Laser Peening

Additive-manufactured metals have a low fatigue limit due to the defects formed during the manufacturing process. Surface defects, in particular, considerably degrade the fatigue limit. In order to expand the application range of additive-manufactured metals, it is necessary to improve the fatigue limit and render the surface defects harmless. This study aims to investigate the effect of laser peening (LP) on the fatigue strength of additive-manufactured maraging steel with crack-like surface defects. Semicircular surface slits with depths of 0.2 and 0.6 mm are introduced on the specimen surface, and plane bending-fatigue tests are performed. On LP application, compressive residual stress is introduced from the specimen surface to a depth of 0.7 mm and the fatigue limit increases by 114%. In a specimen with a 0.2 mm deep slit, LP results in a high-fatigue-limit equivalent to that of a smooth specimen. Therefore, a semicircular slit with a depth of 0.2 mm can be rendered harmless by LP in terms of the fatigue limit. The defect size of a 0.2 mm deep semicircular slit is greater than that of the largest defect induced by additive manufacturing (AM). Thus, the LP process can contribute to improving the reliability of additive-manufactured metals. Compressive residual stress is the dominant factor in improving fatigue strength and rendering surface defects harmless. Moreover, the trend of the defect size that can be rendered harmless, estimated based on fracture mechanics, is consistent with the experimental results.

scholarly journals Improving Fatigue Strength of Butt Welded Joints by Laser Peening and Its Main Factor

2011 ◽  
Vol 29 (3) ◽  
pp. 146-153 ◽  
Author(s):  
Yoshihiro SAKINO ◽  
Yuji SANO ◽  
Rie SUMIYA ◽  
You-Chul KIM
Keyword(s):  
Fatigue Strength ◽  
Welded Joints ◽  
Laser Peening ◽  
Main Factor

scholarly journals Influence of Reversion Austenite on Fatigue Strength of Shot-Peened Maraging Steel.

2001 ◽  
Vol 50 (10) ◽  
pp. 1126-1132 ◽  
Author(s):  
Michihiko MORIYAMA ◽  
Takanori NAGANO ◽  
Norio KAWAGOISHI ◽  
Setsuo TAKAKI
Keyword(s):  
Fatigue Strength ◽  
Maraging Steel

A fast evaluation method for fatigue strength of maraging steel: The minimum strength principle

2020 ◽  
Vol 789 ◽  
pp. 139659
Author(s):  
Z.K. Xu ◽  
B. Wang ◽  
P. Zhang ◽  
Z.F. Zhang
Keyword(s):  
Fatigue Strength ◽  
Maraging Steel ◽  
Evaluation Method ◽  
Fast Evaluation

scholarly journals Effects of laser peening on the fatigue strength and defect tolerance of aluminum alloy

2020 ◽  
Vol 43 (4) ◽  
pp. 845-856 ◽  
Author(s):  
Koji Takahashi ◽  
Yuta Kogishi ◽  
Norihito Shibuya ◽  
Fumiaki Kumeno
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Strength ◽  
Laser Peening ◽  
Defect Tolerance

scholarly journals Influence of defects on axial fatigue strength of maraging steel specimens produced by additive manufacturing

2018 ◽  
Vol 165 ◽  
pp. 02005 ◽  
Author(s):  
Daniele Rigon ◽  
Giovanni Meneghetti ◽  
Michael Görtler ◽  
Daniele Cozzi ◽  
Wolfgang Waldhauser ◽  
...  
Keyword(s):  
Electron Beam ◽  
Fatigue Strength ◽  
Fatigue Test ◽  
Maraging Steel ◽  
Layer By Layer ◽  
Test Results ◽  
Powder Bed ◽  
Beam Laser ◽  
Laser Beam Melting ◽  
Axial Fatigue

Nowadays many materials such as steels, aluminium and titanium alloys can be realised by powder bed solutions melting subsequently powder layers by means of a laser or electron beam (Laser Beam Melting – LBM and Electron Beam Melting – EBM). The microstructure realised by layer-by-layer solidification having high cooling rate cannot be considered isotropic. Therefore, the mechanical properties could be influenced by the building direction. Regarding maraging steel, the study of the influence of the building direction and the heat treatment on the static and axial fatigue strength has been investigated in a previous contribution. A large scatter of the fatigue test results was found because of the presence of detrimental surface and subsurface defects. The aim of this contribution is to present additional axial fatigue test results of maraging steel characterized by different build orientation and providing an analysis of the defects observed at the crack initiation area of the fracture surface.

Fatigue Strength of Nitrided 18Ni 300 Grade Maraging Steel

2003 ◽  
Vol 251-252 ◽  
pp. 33-40 ◽  
Author(s):  
Norio Kawagoishi ◽  
Kazuhiro Morino ◽  
Hironobu Nisitani ◽  
Nu Yan ◽  
Takashi Yamakita
Keyword(s):  
Fatigue Strength ◽  
Maraging Steel

scholarly journals Effects of Shot Peening on Fatigue Strength of 18%Ni Maraging Steel.

1999 ◽  
Vol 65 (639) ◽  
pp. 2267-2273 ◽  
Author(s):  
Michihiko MORIYAMA ◽  
Takanori NAGANO ◽  
Norio KAWAGOISHI ◽  
Setsuo TAKAKI ◽  
Etsuichi NAGASHIMA
Keyword(s):  
Fatigue Strength ◽  
Maraging Steel ◽  
Shot Peening

G030133 Effect of Aging Condition on Fatigue Strength of Maraging Steel

2011 ◽  
Vol 2011 (0) ◽  
pp. _G030133-1-_G030133-5
Author(s):  
Kousuke HAYASHI ◽  
Takanori NAGANO ◽  
Michihiko MORIYAMA ◽  
Norio KAWAGOISHI
Keyword(s):  
Fatigue Strength ◽  
Maraging Steel ◽  
Aging Condition
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