Ama-Cracks amaningi
Ngaphambili kwe-crystallization eqinisiwe, ngaphansi kwesenzo sokushisa okuphezulu nokucindezeleka, amaphutha e-lattice ahamba futhi ahlanganiswe ukuze enze umngcele wesibili, osesimweni esiphansi sepulasitiki ekushiseni okuphezulu, futhi imifantu ikhiqizwa ngaphansi kwesenzo sokucindezeleka.Imifantu ye-Multilateral ngokuvamile ivela kumashisela ezinsimbi ezihlanzekile noma ama-alloys esigaba esisodwa se-austenitic noma eduze komthungo, futhi ayingxenye yohlobo lwemifantu eshisayo.
Phinda Ushise Imifantu
Okwezinsimbi ezinesakhiwo esishiselwe ipuleti eliwugqinsi kanye nezinye izinto eziyingxubevange eziqinisa izulu, imifantu eyenzeka ezingxenyeni ezimahhadla zendawana ethinteke ukushisa ngesikhathi sokwelashwa kokushisa kokunciphisa ingcindezi noma isevisi ezingeni lokushisa elithile kuthiwa yi-reheat cracks.Ukushisa kabusha imifantu kwenzeka ezingxenyeni ezimahhadla zendawana ethinteke ukushisa kwezinsimbi ezinengxubevange ephezulu, izinsimbi ezikwazi ukumelana nokushisa, izinsimbi ezingenasici ze-austenitic kanye namanye ama-alloys asekelwe ku-nickel.
Imifantu Ebandayo
Ukuqhekeka okubandayo kuwuhlobo oluvame kakhulu lwemifantu ekhiqizwa ku-welding, ekhiqizwa lapho izinga lokushisa lipholiswa ekushiseni okuphansi ngemuva kokushisela.Imifantu ebandayo iyenzeka ikakhulukazi endaweni ethintekile ekushiseleni kwensimbi yengxubevange ephansi, insimbi eyingxubevange emaphakathi, ikhabhoni emaphakathi kanye nensimbi ye-carbon ephezulu.Ezimweni ezingazodwana, njengalapho kushiselwa izinsimbi eziqine kakhulu noma ama-alloys athile e-titanium, imifantu ebandayo nayo iyavela kunsimbi yokushisela.
Ngokwezinhlobo ezahlukene zensimbi nezakhiwo okumele zishiselwe, kunezinhlobo ezahlukene zokuqhekeka okubandayo, ezingahlukaniswa cishe zibe yizigaba ezintathu ezilandelayo:
I-Crack ebambezelekile
Kuyindlela evamile yokuqhekeka okubandayo.Isici saso esiyinhloko ukuthi asibonakali ngokushesha ngemva kokushisela, kodwa sinesikhathi sokufaka i-incubation esijwayelekile, futhi i-crack enezici ezibambezelekile ezikhiqizwa ngaphansi kwesenzo esihlangene sesakhiwo esiqinile, i-hydrogen nokucindezeleka kokuvimbela.
Ukucisha Imifantu
Lolu hlobo lokufa ngokuyisisekelo alubambezeleki, lutholakala ngokushesha ngemva kokushisela, ngezinye izikhathi luvela endaweni yokushisela, ngezinye izikhathi lwenzeka endaweni ethintekile ekushiseni.Ikakhulukazi kukhona isakhiwo esiqinile, imifantu ekhiqizwa ngaphansi kwesenzo sokucindezeleka kwe-welding.
I-Low Plastic Embrittlement Crack
Kwezinye izinto ezine-plasticity ephansi, lapho kubanda kuya ekushiseni okuphansi, ubunzima obubangelwa amandla okuncipha budlula indawo yokugcina ipulasitiki yezinto ngokwazo noma imifantu ebangelwa yizinto eziba brittle.Ngenxa yokuthi ikhiqizwa ezingeni lokushisa eliphansi, iphinde ibe enye indlela yokuqhekeka okubandayo, kodwa ayikho into yokubambezeleka.
Ukuqhekeka kwe-Laminar
Enqubweni yokukhiqiza amapulatifomu amakhulu okukhiqiza uwoyela kanye nemikhumbi yokucindezela enezindonga eziwugqinsi, ukuqhekeka kwesinyathelo okuhambisana nesiqondiso sokugingqika kwenzeka ngezinye izikhathi, okubizwa ngokuthi ukuklebhuka kwe-laminar.
Ikakhulukazi ngenxa yokuba khona kokufakwa kwezingqimba (eceleni kokuqondisa okuginqikayo) ngaphakathi kwepuleti lensimbi, ukucindezeleka okukhiqizwa ngesikhathi sokushisela kuhambisana nesiqondiso sokugoqa, okuholela ekubunjweni kwengqimba "okunyathelwe" endaweni ethinteke ukushisa okukude kakhulu nomlilo. idabukile.
I-Stress Corrosion Cracking
Ukuqhekeka okubambezelekile kwezakhiwo ezithile ezishiselwe (njengemikhumbi namapayipi) ngaphansi kwesenzo esihlanganisiwe semidiya egqwalayo kanye nengcindezi.Izinto ezithinta ukuqhekeka kokugqwala kwengcindezi zifaka i-material yesakhiwo, uhlobo lwe-corrosion medium, ukwakheka kwesakhiwo, inqubo yokukhiqiza kanye nokushisela, izinto zokushisela, kanye nezinga lokukhululeka kwengcindezi.Ukugqwala kwengcindezi kwenzeka phakathi nesevisi.
Isikhathi sokuthumela: Apr-24-2022