Indigenous Aircraft Carrier (IAC) ‘Vikrant’ successfully accomplished its maiden sea voyage today for which she had sailed on 04 Aug 21 from Kochi.Trials progressed as planned and system parameters proved satisfactory. The carrier would continue to undergo series of sea trials to prove all equipment and systems prior handing over the vessel to the Indian Navy.
Indigenous Aircraft Carrier (IAC) ‘Vikrant’ designed by Indian Navy's Directorate of Naval Design(DND) is being built at Cochin Shipyard Limited(CSL), a Public Sector Shipyard under Ministry of Shipping(MoS).IAC is a leading example of the nation’s quest for “Atma Nirbhar Bharat” and Indian Navy’s “Make in India” initiative, with more than 76% indigenous content.
The Indigenous Aircraft Carrier is 262 m long, 62 m at the widest part and height of 59 m including the superstructure. There are 14 decks in all, including five in the superstructure. The ship has over 2,300 compartments, designed for a crew of around 1700 people, having gender-sensitiveaccommodation spaces for women officers.The ship with high degree of automation for machinery operation, ship navigation and survivability, has been designed to accommodate an assortment of fixed wing and rotary aircraft.
Stress Corrosion Cracking Studies
Base metal, Gas Tungsten Arc Welding (GTAW) and Shielded Metal Arc Welding (SMAW)
specimens were tested in sodium chloride environment in the constant load type machine. Time to
failure at constant load of 50% yield strength is the criteria for assessing stress cracking corrosion
resistance. Failed SCC test specimens are shown in Fig. 10. SCC test data is given in Table 4. Base
metal which has a combination of ferrite and pearlite fine grained microstructures was observed to be
less susceptible to stress corrosion cracking (SCC). Investigation results clearly revealed that the time
to failure of GTA Welds is higher when compared to base metal and SMA Weld samples. SMA welds
were found to be susceptible to stress corrosion cracking and are attributed to the observed
microstructure changes that occur during welding. Interface between martensite and ferrite will act as
source of crack initiation and propagation for stress corrosion process. Relatively more number of
interfaces of ferrite / martensite in SMA welds might have caused the less SCC resistance when
compared to GTAW welds of steel. Lower heat efficiency of GTAW process decreases the cooling
rate and hence less amount of martensite formation. This reduces the number of favourable sites of
crack initiation of SCC in GTAW welds and improves the SCC resistance
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Under the Gun - Doug Maxwell, Jimmy Fontanez
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Underpass - Doug Maxwell, Jimmy Fontanez
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