Papers by Keyword: IGC

Abstract: Corrosion is a natural occurring phenomenon which exists as a part of our everyday life. Generally stainless steel is having good corrosion resistance which undergo some specific type of corrosion. Corrosion problem in stainless steel has a huge economic and environmental impact on virtually all facts of world’s infrastructure, from highways, bridges, and buildings to oil and gas, chemical processing, and finally it play an ever increasing role in the largest industry in the world is food industry and automotive industry. The corrosion problem is quite costly and it has no easy solution so large amount of money is utilized to analyse the corrosion damage and also to replace the corroded components. The focus of this paper is to investigate the intergranular corrosion studies of industrially important stainless steel of AISI 430 by two different corrosive solutions were 40% Nitric acid (ASTM-A262-Practice C) and copper – copper sulphate 50% Sulphuric acid (ASTM-A262-Practice E) of Gas tungsten Arc welded Metal which were weighted and immersed in test solutions. After immersion, these weldments were removed, washed, and then weighted to determine the weight loss. The analysis of experimental data obtained on intergranular corrosion and the micrographs by Scanning Electron microscope were carefully analysed, monitored, and revealed to study the behaviour of intergranular corrosion of AISI 430, Stainless steel weldments.

Abstract: High strength aluminium alloys provide benefits in vehicle efficiency and reduced energy consumption. Weldable, low copper 7xxx aluminium alloys are being developed for body-in-white production. Here, the influences of thermomechanical history on microstructure and, consequently, on the corrosion behaviour of lean 7xxx aluminium alloy sheet have been investigated. Cold worked microstructures in the alloys studied are susceptible to sub-surface cracking after accelerated corrosion testing. High resolution transmission electron microscopy (HAADF) with allied EDX analysis of a warm rolled alloy has revealed significant differences between some grain boundaries, showing differences in grain boundary precipitate distribution, which is influenced by grain misorientation and thermomechanical processing history. Possible relationships between the previously described phenomena are being sought. Electron backscatter diffraction has been employed to provide crystallographic information concerning grain orientation relationships from specific areas surrounding the attacked microstructure.

Abstract: In this paper, the effects of different TIG welding parameters on corrosion resistance of 321austenitic stainless steel welding joint were studied. Intergranular corrosion, stress-strain curves of SSRT and the fracture surface of the welding joint were investigated by means of intergranular corrosion test, SCC test and SEM. The results showed that the intergranular corrosion cracks did not occur for all joints welded in the range of TIG welding current of 130A~190A. In pure water at room temperature, strain rate at the range of 1×10^-5 s^-1~1×10^-6 s^-1 had little effect on the maximum tensile strength of the material under the same welding conditions and the time of joint fracture increased as the strain rate decreased. At strain rate of 1×10^-6 s^-1, the maximum tensile strength of the joint welded in the current of 130A and 150A decreased significantly in the dyeing assistant and presented stress corrosion sensitivity. Joints welded in the current of 170A and 190A, showed excellent resistance to stress corrosion. Through the analysis of the fracture surface of joints, the joint welded in current of 130A presented a tendency to brittle fracture, while the joints in the current of 170 A and190 A were characterized with ductile fracture.