جوشكاري غير مشابه سوپر آلياژ اينكونل 617 به فولاد زنگ نزن آستنيتي 310 و ارزيابي خواص اتصال

چكيده انگليسي :

114 Dissimilar Welding Between Inconel 617 Superalloy and 310 Stainless Steel and Evaluation of the Joint Properties Hasan Shah hosseini h shahhosseini@ma iut ac ir March 15 2011 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Dr M Shamanian Supervisor Dr A Kermanpur Supervisor Abstract Dissimilar welding between Inconel 617 nickel base superalloy and 310 austenitic stainless steel SS has been investigated in this research Three types of filler materials including ERNiCr3 ERNiCrCoMo and ER310 were used for this purpose Sever restraint was imposed to the joints to simulate the actual industrial welding conditions in the experiments The joint microstructures including the weld metals heat affected zones interfaces and unmixed zones were characterized by utilizing optical and scanning electron microscopy The joint s weldability was examined via the weldability Varestraint test Moreover the mechanical properties such as tensile strength impact resistance and hardness and fracture surfaces of the specimens were investigated Since this joint is usually used at high temperature its mechanical properties and microstructures were investigated after aging at 1000 C for 120 hour The results showed a dendritic structure in the nickel base weld metal without any cracks The cellular dendritic microstructure of 310 SS weld metal comprised low melting point particles that their effect along with the presence of thermal stresses led to the formation of cracks in the weld metal and in the unmixed zone of 310SS base weld metal interface Niobium carbide and Laves eutectic phases were found in the Inconel 82 weld metal as well as severe Nb segregation to interdendritic zones and grain boundaries migration A fine structure and Mo segregation in the interdendritic zones were observed in Inconel 617 weld metal After aging treatment the precipitated particles increased in Inconel 617 and 310SS weld metals especially in the form of chromium and molybdenum carbides In the tensile tests all specimens were ruptured in a ductile manner from the 310 SS base metal In addition the Inconel 617 filler metal made superlative strength and elasticity before aging treatment The welded specimens of Inconel 617 and 310SS filler metals showed the maximum and minimum hardness values respectively Aging treatment caused hardness to increase in weld metals and 617 base metal but it was vice versa for the 310 SS base metal The maximum value of fracture energy was pertained to Inconel 617 weld metal about 205 J The impact resistance was decreased after aging treatment in all cases The weldability test results showed that the Inconel 617 and 310 SS weld metals had the least hot cracking sensitivity up to 1 strain The 310 SS weld metal hot cracking sensitivity was increased extremely to higher strains Inconel 617 showed the minimum hot cracking sensitivity for strains higher than 1 It can be concluded that Incolel 617 is the best choice for the dissimilar welding of Inconel 617 310 SS joints Keywords Dissimilar welding Inconel 617 AISI 310 stainless steel Varestraint test

شاه حسيني، حسن

جوشكاري غير مشابه سوپر آلياژ اينكونل 617 به فولاد زنگ نزن آستنيتي 310 و ارزيابي خواص اتصال

جوشكاري غير مشابه , آزمون وارسترنيت