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, wajoyina izakhi zokwakheka ferrite, ezifana chromium, Silicon, i-aluminium, molybdenum, weld ukwakheka kwesakhiwo sezigaba ezimbili, 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 indawo yokushisa ye-intergranular corrosion ingozi (eyaziwa nangokuthi indawo yokushisa ezwelayo). Insimbi engenasici, 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