I-brittleness ebandayo (noma ukuthambekela kokushisa okuphansi) kweamashubhu abandayo asongwengesikhathi sokusetshenziswa imelelwa izinga lokushisa lokuqina lokuqina kwe-brittleness Tc.I-Tc ye-high-purity iron (0.01% C) iku-100C, futhi ngaphansi kwalokhu kushisa, isesimweni esibucayi ngokuphelele.Izinto eziningi zengxubevange kumapayipi ensimbi agqamile aginqike ngokunemba akhuphula izinga lokushisa eliqinile lamapayipi ensimbi agqamile agingqike abandayo, akhulise ukuthambekela kokubanda okubanda.Uma ukuphuka kwe-ductile kwenzeka ngaphezu kwezinga lokushisa legumbi, indawo yokuphuka yamapayipi ensimbi eqinile agoqelwe ngokubanda iwukuphuka okumise okwe-dimple, kuyilapho ukuphuka okuphukayo kwenzeka ezingeni lokushisa eliphansi, kuwukuphuka kwe-cleavage.
Isizathu sokushisa okuphansi kwe-embrittlement yamashubhu akhanyayo agoqwe abandayo yilokhu:
(1) Uma ukugudluka okukhiqizwa umthombo wokugudluza ngesikhathi sokuguqulwa kuvinjwe izithiyo (ezifana nemingcele yokusanhlamvu noma okulinganayo kwesibili), ukucindezeleka kwendawo kudlula amandla etiyetha wamapayipi ensimbi agqamile agqingqiwe ngokunemba, okuholela kuma-microcracks.
(2) Ukugudluka okunqwabelene okuningana kwakha i-microcrack emngceleni wokusanhlamvu.
(3) Ukusabela ezimpambanweni zamabhande amabili ashelelayo, okubangela ukugudluka okungenakunyakaziswa% 26lt;010% 26gt, nge-microcrack emise okwe-wedish ekwazi ukuqhekeka eduze kwendiza ye-cleavage.
Izici ezithinta ukuqina okubandayo kwamashubhu akhanyayo agoqelwe abandayo afaka:
(1) Izinto eziqinisa isixazululo esiqinile.I-Phosphorus inyusa izinga lokushisa lokuguquka kokuqina ngamandla;Kukhona ne-molybdenum, i-titanium, ne-vanadium;Uma okuqukethwe kuphansi, umthelela awubaluleki, kuyilapho okuqukethwe kuphezulu, ama-elementi akhuphula izinga lokushisa lokuguquka kokuqina zifaka i-silicon, i-chromium, nethusi.Izinto ezehlisa izinga lokushisa lokuguquka kokuqina kokuqina zifaka i-nickel, nezinto eziqala ukwehla bese zikhuphula izinga lokushisa lokuqina lokuqina zifaka i-manganese.
(2) Izakhi ezakha isigaba sesibili.Isici esibaluleke kakhulu sokwandisa ukuhwamuka okubandayo kwamapayipi ensimbi agqamile agoqelwe ngokubandayo anesigaba sesibili yikhabhoni.Njengoba okuqukethwe kwekhabhoni kumapayipi ensimbi agqamile agoqelwe ngokunemba kwanda, okuqukethwe kwe-pearlite kumapayipi ensimbi agqamile okugoqeka okubandayo kuyakhula.Ngokwesilinganiso, kukho konke ukukhuphuka okungu-1% kwevolumu ye-pearlite, izinga lokushisa lokuqina lokuqina likhuphuka ngo-2.2 ℃ ngokwesilinganiso.
(3) Umthelela wokuqukethwe kwekhabhoni ku-brittleness kunsimbi ye-ferritic pearlite.Ukwengezwa kwama-elementi e-microalloying afana ne-titanium, i-niobium, kanye ne-vanadium amafomu ahlakaze ama-nitride noma ama-carbonitrides, okubangela ukwanda kwezinga lokushisa lokushintsha kokuqina kwamapayipi ensimbi agqitshwe ngokubanda anembayo.
(4) Usayizi wokusanhlamvu uthinta izinga lokushisa lokuqina lokuqina, futhi njengoba okusanhlamvu kuhwalala, izinga lokushisa lokuqina kokuqina liyakhuphuka.Ukucwenga usayizi wokusanhlamvu kunciphisa ukuthambekela kokuqina okubandayo kumapayipi ensimbi agoqeke abandayo, okuyindlela esetshenziswa kakhulu.
Isikhathi sokuthumela: Sep-01-2023