Ukulawulwa kokugqwala kwensimbi engagqwali phakathi kwe-granular, insimbi engagqwali engu-304, ukugqwala kwensimbi engagqwali engu-304 kanye nokugqwala kwensimbi engagqwali phakathi kwe-granular cishe ngo-10%, kuzokwenza ukunamathela kwezinhlamvu kwehle, lapho kukhona ukucindezeleka, kube lula kakhulu ukuqhekeka, kushwabane ngisho nokuqhekeka, futhi kufihliwe, kungabonakali ngesimo sako. Kuphinde kubangelwe ezinye izimbangela eziyinhloko zokugqwala. Ukugqwala kwensimbi engagqwali e-austenitic okubangelwa ubumpofu kubangelwa kakhulu imingcele yokusanhlamvu i-Cr, i-Cr kanye ne-c easy form chemical compounds, okuqukethwe yi-Cr.
1, ukwakheka kwamakhemikhali kanye nesakhiwo sawo
(1) Okuqukethwe kwe-C
Okuqukethwe kwe-C kwensimbi umphumela wokugqwala kwe-intergranular kwensimbi engagqwali ye-austenitic kuyisici esibaluleke kakhulu. Ngakolunye uhlangothi, lawula ngokuqinile i-c futhi ugcine okuqukethwe kwekhabhoni kunsimbi eyisisekelo kanye nenduku yokushisela ku-0.08%, ensimbi eyisisekelo kanye nezinto zokushisela engeza izakhi zokuzinzisa ze-Ti, Nb, ukusondelana okuqinile ne-c, ikhabhoni ngaphambi kokubopha kwe-Cr, okukhiqiza inhlanganisela ezinzile.
(2) isakhiwo sezigaba ezimbili
Isakhiwo sesigaba esiphindwe kabili sizokwandisa kakhulu amandla okumelana nokugqwala kwe-intergranular. Ngakolunye uhlangothi, izinto zokwakha i-ferrite, njenge-chromium, i-silicon, i-aluminium, i-molybdenum, ukwakheka kwe-weld kwesakhiwo sesigaba esiphindwe kabili, zihlanganiswe ne-ejenti yokwakha ekhethiwe equkethe izinto zokushisela ze-ferrite.
2, ubuchwepheshe bokushisela
(1) izinga lokushisa elingu-450~850℃ ububanzi bokushisa, ikakhulukazi ku-650 ° c litholakala kalula kakhulu endaweni yokushisa eyingozi yokugqwala (eyaziwa nangokuthi indawo ezwela izinga lokushisa). Ukushisela ngensimbi engagqwali, ukushisela kungathathwa ngaphansi kwe-laminate, noma ngqo emanzini angemuva okuphola kwe-weld, ukuze kuphole ngokushesha, kuncishiswe isikhathi ebangeni lokushisa, kuyizinyathelo ezisebenzayo zokuthuthukisa ukumelana nokugqwala kwamalunga.
(2) ukwanda kwamandla omugqa wokushisela, kuzosheshisa ukugqwala kwensimbi engagqwali ye-austenitic. Ngesikhathi senqubo yokushisela, ngogesi ophansi, isivinini esikhulu sokushisela, indlela yokushintshashintsha okufushane, indlela yokushintshashintsha okuningana, futhi kunciphisa ukushisa. Ukufakwa kokushisa okuphansi, ngendlela yokuzwela izinga lokushisa ngokushesha ngokwanele ukuze kugwenywe ukugqwala okuphakathi kwe-granular kwendawo ethintekile ukushisa.
Isikhathi sokuthunyelwe: Mashi-12-2018