Izici Ezithinta Izakhiwo Zemishini Zensimbi
Izakhiwo zensimbi ezisebenza ngomshini ziyikhono lazo lokuphendula imithwalo noma amandla asebenza kuzo. Lezi zakhiwo zifaka phakathi amandla okudonseka, ubulukhuni, ukuguquguquka, ukuqina, ukumelana nokuguguleka, ukumelana nokukhathala, kanye nokumelana nokuguquguquka okungapheli. Ekwenzeni kobunjiniyela—kungakhathaliseki ukuthi kusekukhiqizweni, ekukhiqizeni, ezimotweni, noma ezindizayo—ukuqonda izici ezithonya izakhiwo zensimbi ezisebenza ngomshini kubalulekile ekuqinisekiseni ukuthi izinto ezikhethiwe ziphephile, zisebenza kahle, futhi zihlala isikhathi eside. Lezi yizici eziyinhloko ezinomthelela omkhulu.
1. Ukwakheka Kwamakhemikhali kanye Nezakhi Ze-Alloy
Ukwakheka kwamakhemikhali kuyisici esiyisisekelo sezakhiwo zensimbi. Ensimbini, isibonelo, okuqukethwe kwekhabhoni kuthonya kakhulu amandla nokuqina. Amazinga aphezulu ekhabhoni ngokuvamile andisa amandla nokuqina, kodwa anciphisa ukuguquguquka nokushibilika. Kuma-alloy, izinto ezifana ne-chromium (Cr), i-nickel (Ni), i-molybdenum (Mo), i-vanadium (V), kanye ne-manganese (Mn) zengezwa ukuze kufezwe inhlanganisela ethile yezakhiwo.
Izinto ezixubayo zingakha izixazululo eziqinile, ama-precipitate, noma ama-carbide avimbela ukunyakaza kokuhlukana. Ngenxa yokuthi ukuguquguquka kwepulasitiki ezinsimbini kuqhutshwa kakhulu ukunyakaza kokuhlukana, lapho ukuvinjelwa kokuhlukana kukhulu, kulapho amandla okukhiqiza kanye nokuqina kuphakama khona. Kodwa-ke, amandla akhuphukile avame ukuza ngezindleko zokuncipha kokuhlukana, ngakho abaklami kudingeka balinganisele lokhu kokubili ngokusekelwe ezidingweni zohlelo lokusebenza.
2. Isakhiwo Esincane (Isakhiwo Esincane)
Isakhiwo esincane siwukwakheka kwezigaba, usayizi wezinhlamvu, ukuma kwezinhlamvu, kanye nokusatshalaliswa kwezigaba ngaphakathi kwensimbi. Isakhiwo esincane sinquma kakhulu ukuthi insimbi izoshintsha futhi iqhekeke kanjani. Ubukhulu bezinhlamvu ezincane ngokuvamile bukhulisa amandla nokuqina ngokusebenzisa izindlela zokuqinisa imingcele yezinhlamvu, ezivame ukuchazwa ubudlelwano beHall-Petch: uma usayizi wezinhlamvu uncane, kuba nzima kakhulu ukuthi ukuhlukana kudlule imingcele yezinhlamvu.
Ukusatshalaliswa kwesigaba nakho kudlala indima ebalulekile. Ensimbini, isibonelo, isilinganiso se-ferrite, i-pearlite, i-bainite, ne-martensite sizokhiqiza izakhiwo ezahlukene. I-Martensite iqinile kakhulu futhi inamandla kodwa ivame ukuba buthakathaka uma ingashisi. I-Pearlite inikeza inhlanganisela yamandla nokuguquguquka okulinganiselayo. Ngakho-ke, ukulawula isakhiwo esincane ngezinqubo zokushisa nezemishini kuyisihluthulelo sokulungisa izakhiwo zemishini.
3. Inqubo Yokukhiqiza kanye Nomlando Wokuguqulwa
Indlela insimbi eyakhiwe ngayo—njengokuphonswa, ukugqunywa, ukugoqwa, ukukhipha, noma ukudweba ucingo—idala umlando wokuguquka othinta izakhiwo zemishini. Ukuguquka kwepulasitiki emazingeni okushisa athile kungandisa amandla ngokuqina kokucindezeleka. Njengoba insimbi iguquguquka, ubuningi bokuhlukana kwayo buyanda futhi iyashayisana, ngaleyo ndlela kuvimbele ukunyakaza kwayo futhi kwenze izinto zibe nzima futhi ziqine.
Kodwa-ke, ukuqina kokucindezeleka kunganciphisa nokuqina. Emisebenzini yokwakha ethuthukisiwe, insimbi "eqinile" kakhulu ngenxa yokuqina kokucindezeleka ingaqhekeka. Ngakho-ke, ukuqinisa kuvame ukwenziwa embonini phakathi kwezigaba zokwakha ukuze kubuyiselwe ukuqina ngokusebenzisa ukwenziwa kabusha kwekristalu kanye nokukhula kokusanhlamvu.
4. Ukwelashwa Kokushisa
Ukwelashwa ngokushisa kungenye yezindlela eziphumelela kakhulu zokushintsha izakhiwo zensimbi ngaphandle kokushintsha isimo sazo. Ensimbini, ukwelashwa ngokushisa okufana nokucima nokushisa kungakhiqiza i-martensite eqinile bese kwandisa ukuqina ngokushisa. Ukulungisa kungalungisa isakhiwo esincane futhi kuthuthukise ukufana kwezakhiwo. Kwezinye izinhlobo ze-aluminium alloys, ukwelashwa ngesisombululo nokuguga kukhiqiza ukuqina kwemvula, okwandisa amandla ngenkathi kugcinwa isisindo esincane.
Ukwelashwa ngakunye kokushisa kushintsha izigaba kanye nokusatshalaliswa kwazo, kulawula ukuminyana, futhi kuthinta usayizi wezinhlamvu. Umphumela wokugcina uncike ekushiseni, isikhathi sokubamba, kanye nesilinganiso sokupholisa. Amaphutha amancane kulezi zinhlaka angabangela izakhiwo ezikude kakhulu nomgomo, njengokuba buthakathaka kakhulu, ukuthamba kakhulu, noma ukungazinzile emazingeni okushisa okusebenza.
5. Amaphutha Ezinto Ezibonakalayo kanye Nekhwalithi Yangaphakathi
Akukho okubalulekile okuphelele ngempela. Amaphutha anjengokuqhekeka, ukufakwa okungeyona insimbi, ukuhlukaniswa kwamakhemikhali, ukuqhekeka okuncane, noma izikhala zokuncipha ezicijini kungaba yindawo yokuqala yokwehluleka. La maphutha anciphisa indawo ephumelelayo yesigaba, andise ukugxila kokucindezeleka, futhi asheshise ukuqhekeka kokukhathala. Ukufakwa, isibonelo, kungaba yindawo yokuqala kokuqhekeka lapho okubalulekile kulayishwa ngokujikeleza.
Ikhwalithi yensimbi ithonywa kakhulu yinqubo yokukhiqiza: ukulawulwa kokuhlanzeka kwensimbi encibilikisiwe, amasu okukhipha igesi, ukuhlunga, ukulawula izinga lokupholisa, kanye nokuhlolwa okungonakalisi. Ezisetshenzisweni ezibalulekile njengezingxenye zendiza noma imikhumbi yokucindezela, ngisho neziphambeko ezincane zingaba yingozi, zikhule zibe imifantu emikhulu phakathi nesikhathi sokuphila kwengxenye.
6. Isimo Somphezulu Nokwelashwa Komphezulu
Izakhiwo zemishini azinqunywa nje kuphela "ngaphakathi" lento, kodwa futhi nangokwesimo sayo sobuso. Ubulukhuni bomphezulu, imihuzuko, kanye nezimbobo kusebenza njengezinto ezigxilisa ukucindezeleka, kunciphisa ukumelana nokukhathala futhi kwandisa ingozi yokuphuka okuqhekeka. Ukwehluleka okuningi kokukhathala kuqala ebusweni, ikakhulukazi emigodini ejikelezayo, eziphethwini, nasezingxenyeni ezithwalwa umthwalo ojikelezayo.
Ngakho-ke, ukwelashwa kwendawo efana nokuphuma kwesibhamu (ukudala ukucindezeleka okusele kokucindezela), ukufaka i-carburizing, ukufaka i-nitriding, ukufaka i-coating, noma ukufaka i-hardfacing kuvame ukusetshenziselwa ukuthuthukisa ubulukhuni bendawo, ukumelana nokuguguleka, kanye nokumelana nokukhathala. Lokhu kuthuthukiswa kubaluleke kakhulu ezingxenyeni ezibhekene nokungqubuzana nokuxhumana okuphindaphindiwe.
7. Izinga Lokushisa Lokusebenza kanye Nemvelo
Izakhiwo zemishini zezinsimbi ziyashintsha ngokushisa. Ngokuvamile, izinga lokushisa elikhulayo linciphisa amandla nokuqina, kodwa kwandisa ukuguguleka. Emazingeni okushisa aphezulu, ukukhukhuleka kuba yinto ebalulekile: insimbi idlula kancane kancane ekuguqukeni okuhlala njalo ngisho nangaphansi kwemithwalo emincane engaguquki. Lokhu kubalulekile kuma-turbine, ama-boiler, kanye nezinhlelo zokususa ukushisa.
Ngakolunye uhlangothi, emazingeni okushisa aphansi, ezinye izinsimbi (ikakhulukazi izinsimbi ezithile) zingadlula ekushintsheni kwe-ductile-brittle, okwenza zibe sengozini yokuqhekeka kwe-brittle. Indawo ezungezile nayo ithinta izakhiwo ngokugqwala, i-oxidation, noma i-embrittle. Isibonelo, i-hydrogen ingabangela i-hydrogen embrattle ensimbini enamandla amakhulu, okubangela ukuba iqhekeke ngisho nangaphansi kwemithwalo emaphakathi. Ukuqhekeka kwe-stress corrosion kungenzeka lapho i-tensile stress kanye nendawo egqwalisayo kusebenzelana.
8. Izinga Lokulayisha kanye Nohlobo Lomthwalo
Izinsimbi zisabela ngendlela ehlukile ekulayisheni okungaguquki, okuguquguqukayo, noma okujikelezayo. Ngamazinga aphezulu okulayisha okuthinta, ezinye izinto zibonisa amandla abonakalayo aphezulu, kodwa zingaba buthakathaka kakhulu kuye ngesakhiwo sazo esincane kanye nokushisa. Ukuqina kokuthinta kulinganisa ikhono lento yokumunca amandla ngaphambi kokuqhekeka futhi kuthonywa kakhulu yizinga lokucindezeleka.
Ngomthwalo ojikelezayo, ukumelana nokukhathala kuyisici esiyinhloko. Ngisho nokucindezeleka okuphansi kunamandla okukhiqiza kungaholela ekuhlulekeni ngemva kwezigidi zemijikelezo. Ngakho-ke, ukwakheka kokukhathala kubheka ukugxila kokucindezeleka, ikhwalithi yobuso, ukucindezeleka okusele, kanye nesakhiwo esincane.
Isiphetho
Izakhiwo zemishini zezinsimbi zithonywa yinhlanganisela eyinkimbinkimbi yokwakheka kwamakhemikhali, isakhiwo esincane, inqubo yokukhiqiza, ukwelashwa kokushisa, amaphutha angaphakathi, izimo zobuso, izinga lokushisa lokusebenza kanye nendawo ezungezile, kanye nezici zokulayisha. Akukho nto eyodwa ekhona ngokuhlukana—izinguquko kwesinye zivame ukuthinta ezinye. Ebunjiniyela bezinto zokwakha, isihluthulelo sempumelelo sisekulawuleni lezi zinto ngendlela ehlanganisiwe ukuqinisekisa ukuthi insimbi inamandla, ukuguquguquka, ukuqina, kanye nokuqina okudingekayo emsebenzini. Ngokuqonda okufanele, ukukhethwa kwezinto zokwakha kanye nenqubo kungalungiswa, izingozi zokwehluleka zingancishiswa, futhi impilo yesevisi yezingxenye ingandiswa kakhulu.
