EVALUATION OF ANISOTROPY AND STRAIN HARDENING EXPONENT OF SS304L TAILOR WELDED BLANKS
Keywords:
Anisotropy, Strain hardening exponent, SS304L, TIG WeldingAbstract
Computation of planar/normal anisotropy and strain hardening exponent is a key process to evaluate the formability of sheet metals. In this work, a comparative study has been performed between as received and autogenously TIG welded sheets of SS 304L. Uniaxial tensile tests were carried out on along three directions, along (0°), across (90°) and diagonal (45°) to the rolling direction and the corresponding anisotropic values were calculated. Metallography by optical microscope was carried out in order to correlate the tensile test results. Tensile test results show that yield strength (σy) of welded sample was found to be higher than as received samples, whereas the ultimate strength (σu) values have decreased. The higher dislocation density and the relative higher hardness in the weld metal zone is attributed to this mechanical behavior. The normal anisotropy (rm) and strain hardening exponent (n) of the TIG welded samples are found to be greater than values of as received samples.
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