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008 151216s2015 ua dh f m 000 0 eng d
040 _aEG-GiCUC
_beng
_cEG-GiCUC
041 0 _aeng
049 _aDeposite
097 _aM.Sc
099 _aCai01.13.12.M.Sc.2015.Mo.E
100 0 _aMohamed Mahmoud Ali Ali Hassan
245 1 0 _aEffect of nitrogen content in argon shielding and backing gases on properties of hyper duplex UNS S32906 /
_cMohamed Mahmoud Ali Ali Hassan ; Supervised Mohamed R. Elkoussy , Nahed A .Abdelraheem
246 1 5 _aUNS S32906تأثير محتوي النيتروجين في غاز الارجون الواقي و الخلفي علي خواص الصلب الهايبر دوبلكس
260 _aCairo :
_bMohamed Mahmoud Ali Ali Hassan ,
_c2015
300 _a71 P. :
_bcharts , facsimiles ;
_c30cm
502 _aThesis (M.Sc.) - Cairo University - Faculty of Engineering - Department of Metallurgical Engineering
520 _aThis research was aimed at investigating the effect of shielding and backing gases composition by supplementing nitrogen compared to usage of pure argon on: (i) microstructure of hyper duplex stainless steel root weld and phase balance within the weld regions; (ii) mechanical properties of the root weld zone in terms of amount of impact toughness and Vicker{u2019}s hardness; (iii) ferrite Content measurement ); (iv) susceptibility to pitting corrosion in terms of mass losses It was found that adding 2% nitrogen to argon in the composition of the shielding/backing gases in welding the root passes by gas tungsten arc welding process significantly improves the weld mechanical characteristics, phase balancing and noticeably enhances the corrosion resistance of the weldment. This is related to nitrogen which is a strong austenite stabilizer which leads to increase the austenite content in the weld zone during welding. And it was found that inferior mechanical properties, imbalanced microstructure which leads to poor corrosion resistance in the root weld zone were obtained in case of using pure argon gas as a shielding/backing gas
530 _aIssued also as CD
653 4 _aHyper duplex
653 4 _aNitrogen
653 4 _aShielding gas
700 0 _aMohamed Raafat Elkoussy ,
_eSupervisor
700 0 _aNahed Ahmed Abdelraheem ,
_eSupervisor
856 _uhttp://172.23.153.220/th.pdf
905 _aEnas
_eCataloger
905 _aNazla
_eRevisor
942 _2ddc
_cTH
999 _c53961
_d53961