Abstract
Welding of 9 %Ni steel was conducted using gas tungsten arc welding (GTAW) and submerged arc welding (SAW). High-cycle fatigue (HCF) tests were performed at 297 K and 77 K to investigate the effect of welding process on fatigue properties of the joints. The results showed that GTAW joint (GJ) exhibited a longer fatigue life than SAW joint (SJ) under similar situation. At 297 K, the fatigue limit for GJ and SJ was measured as 231.3 MPa and 202.5 MPa respectively. All the fracture locations were at weld metal (WM), with cracks initiating from Mo-enriched precipitates in GJ and non-metallic inclusions in SJ. The microstructure of GJ and SJ was similar. However, WM of GJ had fewer inclusions and a finer grain size than that of SJ, enhancing the HCF performance of the joints.
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