The Effect of Microstructure on Mechanical Properties and Fatigue Crack Growth Behavior of TC4-DT Alloy

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This paper examines the influence of different microstructure on the mechanical properties and fatigue crack growth behavior of TC4-DT alloy at room temperature. Different heat treatments were carried out in order to produce the microstructure of bimodal and lamellar conditions. Results show that, the tensile properties and fracture toughness of bimodal and lamellar microstructure was varied by different heat-treatment. In contrast on bimodal microstructure, the lamellar microstructure presents high fracture toughness and low fatigue crack growth rate, but the yield stress and ductility declines. The analysis results indicted that the lamellar microstructure obtained by air cooling from the  phase field showed the integrated condition of tensile properties and fracture toughness duo to the fine secondary  lamella, and the better fatigue crack growth behavior.

Info:

Periodical:

Advanced Materials Research (Volumes 490-495)

Edited by:

Ran Chen and Wen-Pei Sung

Pages:

3767-3772

DOI:

10.4028/www.scientific.net/AMR.490-495.3767

Citation:

L. W. Zhu et al., "The Effect of Microstructure on Mechanical Properties and Fatigue Crack Growth Behavior of TC4-DT Alloy", Advanced Materials Research, Vols. 490-495, pp. 3767-3772, 2012

Online since:

March 2012

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$38.00

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