Abstract
In the present research work, activating flux tungsten inert gas (A-TIG) weld joints of AISI 409 ferritic stainless steel was subjected to post weld heat treatment at 750 °C followed by the air cooling. To study the effect of tempering time on the microstructural and mechanical properties of the weld fusion zone, tempering time was varied from 2 to 10 h. The current study also demonstrated the comprehensive microstructure–mechanical property relationships using the collective techniques of optical and electron microscopy, electron dispersive X-ray analysis techniques, and X-ray diffraction analysis. The results indicated that the Charpy toughness of the fusion zone improved after 2 and 4 h of tempering, but the further stretch in tempering time resulted in a drastic drop in Charpy toughness. The shape of the sulphide inclusions was found to be an important factor in deciding the Charpy toughness of the A-TIG weld fusion zone. Maximum impact energy of 116 ± 9 J was observed by the sample tempered for 4 h.
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