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Acta Metall Sin  2009, Vol. 45 Issue (11): 1378-1383    DOI:
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ANALYSIS ON FATIGUE PROPERTY OF MICROSHOT PEENED MEDIUM CARBON STEEL
ZHANG Jiwang; LU Liantao; ZHANG Weihua
State Key Laboratory of Traction Power; Southwest Jiaotong University; Chengdu 610031
Cite this article: 

ZHANG Jiwang LU Liantao ZHANG Weihua. ANALYSIS ON FATIGUE PROPERTY OF MICROSHOT PEENED MEDIUM CARBON STEEL. Acta Metall Sin, 2009, 45(11): 1378-1383.

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Abstract  

In order to analyze the fatigue property and residual stress relaxation process of microshot peened medium carbon steel, the 109 cyc fatigue tests of the specimens unpeened and shot peened by steel balls and ceramics balls with 100 $\mu$m in diameter were carried out by rotary bending fatigue machine in air at room temperature. The result shows that the fatigue limits of specimens peened by steel balls and ceramics balls are improved by 35% and 23% respectively, compared with that of unpeened specimen. Based on the test result of the residual stress in the fatigue process, the process and mechanism of residual stress relaxation are analyzed in detail. The cyclic yield strength of the material is the main factor controled the improvement level of the fatigue limit.

Key words:  medium carbon steel      microshot peening      stress relaxation      fatigue limit      cyclic yield strength     
Received:  24 April 2009     
ZTFLH: 

TG111

 
  TG135

 
Fund: 

Supported by National Natural Science Foundation of China (Nos.50671086 and 50821063) and National Basic Research Program of China (No.2007CB714705)

URL: 

https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2009/V45/I11/1378

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