scholarly journals The Notch Effect on the Fatigue Strength of Nodular Cast Iron and the Shift of Rupture Area as a Function of Stress Level or Fatigue Life

1958 ◽  
Vol 7 (52) ◽  
pp. 34-39
Author(s):  
Shigetsune AOYAMA ◽  
Toru TAKAHASHI
Keyword(s):  
Cast Iron ◽  
Fatigue Life ◽  
Fatigue Strength ◽  
Stress Level ◽  
Nodular Cast Iron ◽  
Notch Effect ◽  
Rupture Area

scholarly journals Effect of residual stress on fatigue strength of induction hardened nodular cast iron.

1988 ◽  
Vol 37 (417) ◽  
pp. 631-636 ◽  
Author(s):  
Katsushi SARUKI ◽  
Akira YAMADA ◽  
Kazuyoshi OGAWA
Keyword(s):  
Residual Stress ◽  
Cast Iron ◽  
Fatigue Strength ◽  
Nodular Cast Iron

Fatigue Behavior of the Low-Strength Steel Welded Joints Treated by TIG Dressing and Ultrasonic Peening Combined Method

2011 ◽  
Vol 295-297 ◽  
pp. 1885-1889
Author(s):  
Sen Li ◽  
Dong Po Wang ◽  
Hai Zhang ◽  
Bo Tan
Keyword(s):  
Fatigue Life ◽  
Fatigue Strength ◽  
Stress Concentration ◽  
Compressive Stress ◽  
Stress Level ◽  
Stress Concentration Factor ◽  
Concentration Factor ◽  
Combined Method ◽  
Ultrasonic Peening ◽  
Weld Toe

Butt-joint specimens of Q235B low-strength steel were treated by TIG dressing and ultrasonic peening combined method. The paper presents comparative fatigue test for welded specimens in the as-welded condition and specimens treated by TIG dressing, ultrasonic peening treatment (UPT) and the combined method. When the ratio of stress R=0.1, contrasted with the specimens in as welded condition, the fatigue strength of the specimens treated by TIG dressing is increased by 36%. The fatigue strength of the specimens treated by the combined method and UPT are almost the same, which are increased by 57% and 56% respectively. In the high stress level, weld toe treated by the combined method has smaller stress concentration factor than that of UPT, resulting in less release of residual compressive stress. So it's more effective to improve the fatigue life by the combined method. While in the low stress level, the residual compressive stress of weld toe treated by the combined method and UPT are nearly the same. Besides, the effect of stress concentration factor is smaller, thus the fatigue life of the two methods have little difference.

Prediction of the Fatigue Strength Defining Mechanism of Nodular Cast Iron Based on Statistical Microstructural Features

2021 ◽  
Author(s):  
Joona Vaara ◽  
Miikka Väntänen ◽  
Jarkko Laine ◽  
Jukka Kemppainen ◽  
Tero Frondelius
Keyword(s):  
Cast Iron ◽  
Fatigue Strength ◽  
Nodular Cast Iron ◽  
Iron Based

scholarly journals Influence of Aluminum on Fatigue Strength of Solution-Strengthened Nodular Cast Iron

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 311
Author(s):  
Christian Gebhardt ◽  
Johannes Nellessen ◽  
Andreas Bührig-Polaczek ◽  
Christoph Broeckmann
Keyword(s):  
Cast Iron ◽  
Fatigue Strength ◽  
Aluminum Content ◽  
Nodular Cast Iron ◽  
Fatigue Properties ◽  
Matrix Microstructure ◽  
Graphite Morphology ◽  
Wide Range ◽  
Negative Effect ◽  
High Silicon

The fatigue strength of high silicon-alloyed nodular cast iron is influenced by casting defects and graphite precipitates. The literature as well as the findings of this work show that these microstructural constituents can be tailored by controlling silicon microsegregation. In addition, segregations also affect the ferritic matrix microstructure locally. In the present work, silicon segregations in high silicon-alloyed ductile iron are specifically manipulated by small additions of aluminum. It was demonstrated how the aluminum content affects a wide range of microstructural constituents across a variety of length scales. Specimens from alloys with small additions of aluminum were fabricated and tested by rotating bending. Results show that the fatigue strength can be increased compared to a reference alloy with no aluminum. Microstructure analysis as well as fractography were performed concluding that microstructural changes could be attributed to the increased aluminum content, which allows the fatigue properties to be tailored deliberately. However, according to the results of this study, the negative effect of aluminum on castability and graphite morphology limits the maximum content to approximately 0.2 wt.%.

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