By W. Sudnik
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Sample text
It confirms that, independently of the welding process (MIEA and FSW), the crack growth conditions are directly influenced by the temperature within the HAZ, which is normally above of the aging temperature of the alloy, causing a hardening lost and important decrease in mechanical properties. a) b) c) d) Fig. 16. 1, b-d) Fatigue crack growth rate as function of stress intensity factor range (Ambriz et al, 2010). 64 Table 2. Comparison between MIEA and FSW based on a critical crack length. BM = Base metal, i corresponds to weld metal or HAZ for MIEA or FSW (Ambriz et al, 2010).
2008). Partially melted zone cracking in AA6061 welds. Materials & Design, Vol. ; Yoshida, Y. Galtier, A. (2004). Fatigue properties of arc-welded lap joints with weld start and end points. Fatigue & Fracture Engineering Materials & Structures, Vol. 27, Issue 12, (Dec 2004), pp. 1147-115, ISSN: 8756-758X Turnbull, A. & Nimmo, B. (2005). Stress Corrosion Testing of Welded Supermartensitic stainless gas steel for oil and gas pipelines. Corrosion Engineering Science and Technology, Volume 40, Issue 2, (June 2005), pp.
2010b). Experimental results for a, were plotted in da/dN versus ∆K graphs according to Paris law: da n C K dN (4) where C and n are constants obtained directly from the fitting curve. Fig. , 2008). Fig. 16b, shows the FCG for base metal in both directions. This graph shows that the microstructure aspect (anisotropy) does not have an important influence in terms of FCG as could be expected, taking into consideration that yield strength in the base metal parallel to rolling direction is higher than transverse direction.
