MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Effect of ARB Processing on Fatigue Crack Closure in Commercially Pure Titanium
Hiromoto KitaharaSho MatsushitaMasayuki TsushidaShinji Ando
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2013 Volume 54 Issue 4 Pages 528-531

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Abstract

Fatigue crack closure in commercially pure titanium sheets severely deformed using the accumulative roll-bonding (ARB) process were investigated. Sheet processed through 6 cycles of ARB consists of fine equiaxed grains and elongated lamellar grains and shows a high 0.2% proof stress of 790 MPa. Fatigue crack closure was not observed in the ARB processed sheet. The effective threshold stress intensity factor ranges, ΔKth.eff, of the ARB processed sheets and starting sheet are nearly the same. On the other hand, the resistance of the fatigue crack growth rate of the ARB processed sheet is higher than that of the starting sheet. It was found that ARB increases the resistance for the fatigue crack propagation but has no effect on the onset of propagation.

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© 2013 The Japan Institute of Metals
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