Hydrogen induced brittle crack growth in Cu-strengthened HSLA-100 steels

Chattoraj, I and Tarafder, Mita and Das, Swapan K and Tarafder, S (2003) Hydrogen induced brittle crack growth in Cu-strengthened HSLA-100 steels. Materials Science and Engineering A, 339 (1-2). pp. 136-149.

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The annular brittle cracking in notched samples of an HSLA-100 steel has been studied by crack interrupts. The average crack growth rate was found to be geometry and strain rate dependent. Suitable normalisation led to a generalised expression for crack growth rates that was strain rate and geometry independent. The crack growth rates were found to be directly proportional to a ‘critical product’ namely {KIcrack-tip·CHcrack-tip}. The crack initiation threshold for notched specimens showed an inverse exponential relationship with the notch tip hydrogen concentration. The crack tip hydrogen concentration was best represented by a hydrostatic stress equilibrated concentration for shallow notched specimens. Hydrogen deficiency in deep notches necessitated the use of a ‘frozen-in’ concentration approach for determining the crack tip hydrogen.

Item Type:Article
Official URL/DOI:http://dx.doi.org/10.1016/S0921-5093(02)00117-X
Uncontrolled Keywords:Steels; Hydrogen embrittlement; Brittle cracking; Diffusion; Stress intensity factor
Divisions:Corrosion and Surface Engineering
ID Code:54
Deposited By:Dr. A K Sahu
Deposited On:30 Sep 2009 16:28
Last Modified:14 Dec 2011 12:28
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