Author/Authors :
Sakthivel، نويسنده , , T. and Vasudevan، نويسنده , , M. K. Laha، نويسنده , , K. and Parameswaran، نويسنده , , P. and Chandravathi، نويسنده , , K.S. and Mathew، نويسنده , , M.D. and Bhaduri، نويسنده , , A.K.، نويسنده ,
Abstract :
316L(N) stainless steel plates were joined using activated-tungsten inert gas (A-TIG) welding and conventional TIG welding process. Creep rupture behavior of 316L(N) base metal, and weld joints made by A-TIG and conventional TIG welding process were investigated at 923 K over a stress range of 160–280 MPa. Creep test results showed that the enhancement in creep rupture strength of weld joint fabricated by A-TIG welding process over conventional TIG welding process. Both the weld joints fractured in the weld metal. Microstructural observation showed lower δ-ferrite content, alignment of columnar grain with δ-ferrite along applied stress direction and less strength disparity between columnar and equiaxed grains of weld metal in A-TIG joint than in MP-TIG joint. These had been attributed to initiate less creep cavitation in weld metal of A-TIG joint leading to improvement in creep rupture strength.
