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Cyclic Fracture Behaviour of Brazed Martensitic Stainless Steel Joints
Last modified: 2013-05-03
Abstract
In the present work, the cyclic fracture behaviour of brazed joints of the soft
martensitic stainless steel X3CrNiMo13-4 was investigated. The fatigue crack
propagation curves (da/dN-ΔK) were derived for different load ratios R. The
fatigue crack threshold values ΔKth were estimated to be 9 MPa m0.5, 7 MPa m0.5
and 6 MPa m0.5 for the R values of 0.1, 0.3 and 0.5, respectively. In addition,
crack growth curves were derived for different constant loads ΔF. The Paris
exponent, n, was found to be very high compared to homogeneous materials and
indicating that braze joints have a different cyclic fracture behaviour than bulk
materials. The work was completed by SEM investigations of the fractured
specimens.
martensitic stainless steel X3CrNiMo13-4 was investigated. The fatigue crack
propagation curves (da/dN-ΔK) were derived for different load ratios R. The
fatigue crack threshold values ΔKth were estimated to be 9 MPa m0.5, 7 MPa m0.5
and 6 MPa m0.5 for the R values of 0.1, 0.3 and 0.5, respectively. In addition,
crack growth curves were derived for different constant loads ΔF. The Paris
exponent, n, was found to be very high compared to homogeneous materials and
indicating that braze joints have a different cyclic fracture behaviour than bulk
materials. The work was completed by SEM investigations of the fractured
specimens.
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