Residual Stress Measurements on the TIG Weld Joint of 57Fe15Cr25Ni Austenitic Steel for Structural Material Applications by Means X-Ray Diffraction Techniques

Abstract

Measurements of residual stress on the 57Fe25Cr15Ni steel plate with no-filler TIG-welding process wer e carried out. This work was conducted to determine the nature of weld ability in synthesized steel. The bulks were f ormed in a dimension of 30x20x7 mm 3 to ease data retrieval. Results show that the large st residual stress occurred in the weld metal area, amounting to 82.40 MPa with lattice str tching of 0.18%. Conversely, the values decreased to 65.92 MPa and a stretch of 0.14% in the HAZ area. This residu al stress is a tensile stress that can reduce the m echanical strength of the material since it adds to the applied loads. Th is was confirmed by microstructure observations. Th e carbon content was very high in the dark lines. Weaken materials u sually start from this side and could initiate the intergranular cracks that rapidly migrate among its grain boundaries.