Abstract
In order to increase the fatigue strengths of welded joints, a new kind of metal powder spray was developed based on the volume expansion principle, such that the coating would be left in residual compression. Fatigue tests were performed on cruciform welded joints and plates with longitudinal fillet welded attachments in 1Cr18Ni9Ti stainless steel under stress ratio R = 0.1. The specimens were tested in the as-welded condition and after being plasma sprayed with low carbon steel or low transformation temperature metal powder spray. Previous results had indicated that plasma spraying was an effective improvement technique, producing a clear increase in fatigue life over the range of the S-N curve. When the new metal powder spray was used, the improvement was even higher. Compared with specimens sprayed with low carbon steel, the increase in fatigue strength at 2 × 106 cycles and fatigue life over the range investigated of the new metal powder spray were 3.6 to 5.3 % and 16 to 63 % respectively. The extra improvement in fatigue properties was attributed to the presence of a compressive residual stress in the coating.
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