I-Duplex insimbi engagqwali ine-microstructure enezigaba ezimbili, lapho ingxenye yevolumu ye-ferrite ne-austenite icishe ibe ngu-50%.Ngenxa ye-microstructure yazo yezigaba ezimbili, lezi zinsimbi zihlanganisa izakhiwo ezingcono kakhulu zezinsimbi ezingenasici ze-ferritic ne-austenitic.Ngokuvamile, isigaba se-ferritic (i-cubic lattice egxile emzimbeni) sinikeza amandla aphezulu emishini, ukuqina okuhle nokumelana nokugqwala okuhle, kuyilapho isigaba se-austenitic (i-cubic lattice egxile ebusweni) sinikeza i-ductility enhle.
Ngenxa yokuhlanganiswa kwalezi zakhiwo, izinsimbi ezingenasici eziyi-duplex zisetshenziswa kakhulu embonini ye-petrochemical, i-pulp nephepha, yasolwandle neyamandla.Bangakwazi ukumelana nezindawo ezinokhahlo, bandise impilo yesevisi futhi basebenze ezimweni ezimbi kakhulu zemvelo.
Izinto ezisezingeni eliphezulu zinciphisa ubukhulu nesisindo sengxenye.Isibonelo, i-super duplex insimbi engagqwali ingahlinzeka ngokuphindwe kathathu noma kane amandla esivuno kanye nokumelana komgodi wensimbi engagqwali engu-316.
Izinsimbi ezingenasici ze-Duplex zihlukaniswa ngamamaki amathathu ngokusekelwe kokuqukethwe kwe-gravimetric chromium (Cr) kanye nenombolo elinganayo yokumelana ne-pitting (PREN):
Esinye sezici ezibalulekile zokushisela i-DSS, i-SDSS, i-HDSS kanye nezinsimbi ezikhethekile ze-alloy stainless ukulawulwa kwemingcele yokushisela.
Izidingo zenqubo yokushisela embonini ye-petrochemical zikhomba ubuncane be-PREN obudingekayo ezinsimbi zokugcwalisa.Isibonelo, i-DSS idinga inani le-PREN elingu-35, kuyilapho i-SDSS idinga inani le-PREN elingu-40. I-1 ibonisa i-DSS kanye nensimbi yayo yokugcwalisa ehambisanayo ye-GMAW ne-GTAW.Njengomthetho, okuqukethwe kwe-Cr ku-filler metal kuhambisana nokuqukethwe kwe-Cr ensimbi eyisisekelo.Enye indlela okufanele icatshangelwe lapho usebenzisa i-GTAW yezimpande namashaneli ashisayo ukusetshenziswa kwezinsimbi zokugcwalisa i-superalloy.Uma insimbi yokushisela i-inhomogeneous ngenxa yesu elibi, insimbi yokugcwalisa efakwe ngokweqile ingahlinzeka nge-PREN efiselekayo namanye amanani wesampula yokushisela.
Njengesibonelo, ukukhombisa lokhu, abanye abakhiqizi batusa ukusebenzisa intambo yokugcwalisa ye-SDSS (25% Cr) yama-alloys asekelwe e-DSS (22% Cr) kanye ne-HDSS (27% Cr) yocingo yokugcwalisa yama-alloys asekelwe ku-SDSS (25% Cr).I-HDSS filler wire ingasetshenziselwa ama-alloys e-HDSS.Le duplex ye-austenitic-ferritic iqukethe cishe i-ferrite engu-65%, i-chromium engu-27%, i-nickel engu-6.5%, i-5% ye-molybdenum futhi ibhekwa njengengaphansi kuka-0.015% wekhabhoni ephansi.
Uma kuqhathaniswa ne-SDSS, ukupakishwa kwe-HDSS kunamandla okukhiqiza aphezulu kanye nokumelana kangcono nokugqwala nokugqwala.Iphinde ibe nokumelana okuphezulu nokuqhekeka kwe-hydrogen stress kanye nokumelana okuphezulu nezindawo ezine-acidic enamandla kune-SDSS.Amandla ayo aphezulu asho izindleko eziphansi zokunakekela ekukhiqizweni kwamapayipi, njengoba insimbi yokushisela enamandla anele ayidingi ukuhlaziywa kwesici esinomkhawulo kanye nendlela yokwamukela ingase ingashintshile.
Njengoba kunikezwe ububanzi obubanzi bezinto eziyisisekelo, izidingo zemishini nezimo zokusebenza, sicela uthintane ne-DSS kanye nochwepheshe be-filler metal application ngaphambi kokuqhubeka nephrojekthi yakho elandelayo.
I-WELDER, ngaphambili ebibizwa nge-Practical Welding Today, imele abantu bangempela abenza imikhiqizo esiyisebenzisayo nesisebenza ngayo nsuku zonke.Lo magazini ubulokhu usebenzela umphakathi wokushisela eNyakatho Melika iminyaka engaphezu kwengu-20.
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