Effect of austenitic fillers on microstructural and mechanical properties of ultra-low nickel austenitic stainless steel

Abstract

In the present investigation effect of austenitic fillers namely E308, E309 and E310 on microstructural and mechanical properties of ultra-low nickel austenitic stainless steel weldment was analysed. The WRC-1992 diagram has been used to predict δ-ferrite and solidification mode of weld metal. Microstructural exploration confers the variation in magnitude and morphologies of δ-ferrite for different Cr eq /Ni eq ratio. It was observed that greater amount of δferrite resulted in improved tensile strength. On the other hand, it lowered the impact strength of weld joint. The results indicated that E308 exhibits higher hardness and tensile strength, whereas E310 demonstrates higher impact strength and this may be attributed to the variation in δ-ferrite content and solidification mode. During tensile test joints failed in heat affected zone for all weld specimen. Surface morphology of fragmented specimens was analysed using scanning electron microscopy and different morphologies were recognised for samples failed before and after Strauss test.

Effect of Electrodes and Post Weld Solution Annealing Treatment on Microstructures, Mechanical Properties and Corrosion Resistance of Dissimilar High Nitrogen Austenitic and Conventional Austenitic Stainless Steel Weldments

“…The hardness variation, between E308L and E309L weldments as depicted in Fig. 5, can be attributed to the differences in the δ-ferrite content and morphologies 12) . Moreover, an increasing trend in the hardness value was observed when moving towards AISI 201 side via FZ in all three weldments.…”

“…2(a) and 2(b) respectively. This additional lathy ferrite morphology in E308L ller is attributed to the higher Cr/Ni equivalent ratio which, resulted in more amount of retained δ-ferrite and subsequently lathy morphology has been formed 12) . Further, the grain coarsening is observed in HAZ of both the weldments but, it is more prominent towards AISI 201 side.…”

“…The E308L ller weldments (602 MPa) possess higher tensile strength compare to the E309L ller joint (550 MPa) in as-welded condition. The higher amount of δ-ferrite in E308L weldment improves the ductility and tensile strength 12) . The higher carbon content of AISI 201 makes it more susceptible for intergranular precipitations as depicted in Fig.…”

“…Somrerk et al 11) investigated the effect of nitrogen mixing in the shielding gas to minimize the ferrite content of weldment and subsequent effects on the corrosion resistance. Authors in a previous work, 12) have studied the effect of austenitic llers, E308L, E309L and E310L on the microstructural and mechanical properties of ultra-low nickel ASS.…”

Microstructure, Mechanical and Electrochemical Evaluation of Dissimilar low Ni SS and 304 SS using Different Filler Materials

“…Vashishtha et al investigated on effect of austenitic filler on microstructural and mechanical properties of low nickel austenitic stain less steel. They observed that E308 filler contain higher δ ferrite and results in increase tensile strength of the material than sample welded with E309 and E310 filler 19 . Schaeffler's and WRC-1992 are the predictive diagrams for the evaluation of the microstructure and δ ferrite of the weld zone 20 .…”