Effects of phase transformations on residual stresses in welding of stainless steels

• In this investigation, we investigate the effects of solid state phase transformation on residual stresses in welding super-martensitic stainless steels, using the Satoh experimental test approach. The results obtained clearly demonstrate that the austenite-to-martensite phase transformation has remarkable effects on the final tensile residual stress level, and stresses as low as 70 to 170 MPa were found, depending on the weld thermal program. These results may imply that unnecessary conservatism is often used when assuming residual stresses to be of the same order as the base metal yield strength.

Nyckelord

welding

weld simulation

residual stresses

start temperature for martensite transformation

supermartensitic 13% Cr stainless steel

superduplex 25% Cr steel

25% Cr superduplex wire

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