Ukulawulwa kokugqwala kwensimbi engagqwali okuphakathi, insimbi engagqwali engama-304, ukugqwala kwensimbi engagqwali engama-304 kanye nokugqwala kwensimbi engagqwali ye-intergranular corrosion cishe ngo-10%, kuzokwenza ukunamathela kokusanhlamvu kwehle, lapho kukhona ingcindezi, kube lula kakhulu ukuqhekeka, ngisho nokushwabana. , futhi ifihliwe, ingabonakali esimweni sayo.Kuphinde kubangelwa ezinye izimbangela eziyinhloko zokugqwala.I-Intergranular corrosion ye-austenitic stainless steel ebangelwa ubumpofu kakhulu ibangelwa imingcele yokusanhlamvu i-Cr, Cr kanye no-c yenza izinhlanganisela zamakhemikhali ezilula, okuqukethwe kwe-Cr.
1, ukwakheka kwamakhemikhali kanye nesakhiwo
(1) C okuqukethwe
Okuqukethwe kwe-C komphumela wensimbi wokugqwala kwe-intergranular yensimbi engagqwali ye-austenitic kuyisici esikhulu kakhulu.Ngakolunye uhlangothi, lawula ngokuqinile u-c futhi ugcine okuqukethwe kwekhabhoni kusisekelo sensimbi nenduku yokushisela ku-0.08%, kusisekelo sensimbi nezinto zokushisela engeza izinto zokuzinzisa ze-Ti, Nb, ukuhlangana okuqinile no-c, ikhabhoni ngaphambi kokubopha kwe-Cr, kukhiqiza isitebele. inhlanganisela.
(2) ukwakheka kwezigaba ezimbili
Isakhiwo sezigaba ezimbili sizokwandisa kakhulu amandla okumelana nokugqwala kwe-intergranular.Ngakolunye uhlangothi, kuhlanganiswe izakhi zokwakha ze-ferrite, njenge-chromium, i-Silicon, i-aluminium, i-molybdenum, ukwakheka kwe-weld yesakhiwo sesigaba esikabili, ku-ejenti yokwakha ekhethiwe equkethe izinto zokushisela ze-ferrite.
2, ubuchwepheshe bokushisela
(1) izinga lokushisa ku-450 ~ 850℃ izinga lokushisa, ikakhulukazi ku-650 ° c likhiqizwa kalula kakhulu endaweni yengozi yokugqwala kwengozi (eyaziwa nangokuthi indawo yokushisa ezwelayo).Insimbi engagqwali yokushisela, ama-welds angathathwa ngaphansi kwe-laminate, noma ngokuqondile emanzini angemuva okupholisa i-weld, ukupholisa ngokushesha, ukunciphisa isikhathi ebangeni lokushisa, yizinyathelo eziphumelelayo zokuthuthukisa ukumelana nokugqwala kwamalunga.
(2) ukwanda kwamandla kalayini wokushisela, kuzosheshisa ukugqwala kwensimbi engagqwali ye-austenitic.Ngesikhathi senqubo yokushisela, enamanje aphansi, isivinini esikhulu sokushisela, i-short-arc, indlela yokufaka ama-multiple pass welding, nokunciphisa ukushisa.Ukushisa okuphansi okokufaka, ngendlela yokuzwela izinga lokushisa ngokushesha ngokwanele ukugwema ukugqwala kwe-intergranular yendawo ethintekile ukushisa.
Isikhathi sokuthumela: Mar-12-2018