The Influence of Preheat Treatment and Filler Metal Type on Corrosion Resistance of ۳۰۴ and ۴۲۰ Stainless Steel in Dissimilar Welded Joint

In this study corrosion properties of AISI ۴۲۰ martensite and AISI ۳۰۴ austenitic stainless steel were investigated in two preheated and with-out preheated treatment with austenite and martensitic filler metals. After welding by TIG method, potentiodynamic and cyclic polarization corrosion tests were performed on the samples. The microstructure of samples were analyzed by optical microscopy and scnning electron microscopy. The suitable filler metal and the preheating process determined by the results of corrosion and microstructural tests. The results showed that preheat treatment with the use of austenitic filler metal was a suitable method for achieving higher corrosion resistance of AISI ۴۲۰ and AISI ۳۰۴ stainless steels in the dissimilar welded joint.

کلیدواژه ها:

Corrsion Resistance ، Welding ، Preheat treatment ، Filler metal ، مقاومت به خوردگی ، جوشکاری ، عملیات حرارتی پیش گرم ، فلز پرکننده