Abstract
In order to clarify a cause of non-uniform deformation behaviour of austenitic stainless steel weld metals produced with high heat input, crystallographic orientation and internal strain of columnar crystals were studied.
The grain structure of weld metals consists of a central band and both side arms. As the weld metal was stretched along transverse direction to the weld line, the elongation of the central band was larger than that of the side arms of weld metals. Therefore, the thinning of the central band occurred.
Average value of Schmid factor of the columnar crystals in the central band with respect to the tensile direction was the same with that of side arms. While, larger internal strain is observed for the crystals in the side arms in comparison with in the central band.
It is concluded that the thinning of the central band during tensile deformation is due to smaller internal strain of the central band than that of the side arms.
