Fracture Behaviour of Brazed Soft Martensitic Stainless Steel Joints under Cyclic Loading
The fracture behaviour of brazed joints of the soft martensitic stainless steel X3CrNiMo13-4 under cyclic loading is 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, 6 MPa m0.5 and 4 MPa m0.5 for the R values of 0.1, 0.3, 0.5 and 0.7, respectively. In addition, crack growth curves were derived for different constant loads ΔF. The Paris exponent, n, was estimated for the different R values and found to be very high compared to homogeneous materials. The work was completed with microstructural and fractographic investigation by scanning electron microscope (SEM).
Luís Guerra ROSA and Fernanda MARGARIDO
T. A. Başer et al., "Fracture Behaviour of Brazed Soft Martensitic Stainless Steel Joints under Cyclic Loading", Materials Science Forum, Vols. 636-637, pp. 1490-1495, 2010