Abstract
Thermal stress in the weld joints of high-strength steels after welding receives a great influence of dilatation stress during phase transformation, especially martensitic transformation of the low temperature region in weld metal. In order to quantify the amount of residual stress linked with thermal stress, neutron diffraction analyses were carried out in the welded joints having weld metals with very reduced Ms temperatures. In the butt joint of weld metal with an Ms temperature of about 60 °C, compressive residual stresses of about −400 MPa at the weld centre and of about −75 MPa at the toe were observed. The residual stress distributions were quite different from those of conventional weld metals, which have a tensile residual stress of about 400–500 MPa. The formation mechanism of compressive residual stress and the effect of restraint stress and stress-induced transformation on it are discussed, including previous data. It can be concluded that the reduction amount of residual stress induced by low Ms weld metal is about 11–15 MPa per unit length within about 70 mm weld length.
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Shiga, C., Yasuda, H.Y., Hiraoka, K. et al. Effect of Ms Temperature on Residual Stress in Welded Joints of High-Strength Steels. Weld World 54, R71–R79 (2010). https://doi.org/10.1007/BF03263490
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DOI: https://doi.org/10.1007/BF03263490