Yintoni iNsimbi Engagqwaliyo yeNkunkuma?

Intsimbi engagqwaliyo eqinisa imvula, eyaziwa ngokuba yi-PH stainless steel, ludidi olukhethekileyo lwentsimbi engagqwaliyo efumana amandla aphezulu ngenkqubo yonyango lobushushu ekhethekileyo ebizwa ngokuba yi-precipitation hardening. Le nkqubo iphucula iipropati zoomatshini ngaphandle kokuphazamisa ukuxhathisa ukugqwala, okwenza iintsimbi ezingagqwaliyo ze-PH zibe lukhetho olukhethwayo kumashishini anzima afana ne-aerospace, i-petrochemical, i-marine, kunye nokhuselo.

Olu hlobo lwentsimbi engagqwaliyo ludibanisa ukumelana nokugqwala kwee-austenitic stainless grades kunye namandla kunye nobunzima obunokudlula iintsimbi ezininzi zekhabhoni ezinamandla aphezulu. Isiphumo yi-alloy eguquguqukayo enika ukuqina, ukusebenza, kunye nobomi benkonzo ende kwiindawo ezinobundlongondlongo.

Umgaqo osisiseko wokuqinisa imvula

Ukuqina kwemvula yindlela yonyango lobushushu olusebenzisa isinyithi olunyusa amandla okuvelisa izinto ezithambileyo, kuquka intsimbi engatyiwayo, i-aluminium, kunye nee-alloys ezisekelwe kwi-nickel. Kwi-PH stainless steels, le nkqubo ibandakanya amanyathelo amathathu aphambili:

1. Unyango lweSisombululo– Ingxubevange ifudunyezwa kubushushu obuphezulu ukuze inyibilikise izinto ezidibanisayo zibe sisisombululo esiqinileyo.

2. Ukucima– Ukupholisa ngokukhawuleza kuvala izinto ezidibanisayo endaweni yazo, kuthintela ukwakheka kwezigaba ezingafunekiyo.

3. Ukwaluphala (Ukuna kwemvula)– Ukufudumala okulawulwayo kuvumela amasuntswana amancinci, aziwa ngokuba ziiprecipitates, ukuba akheke ngaphakathi kwesakhiwo esincinci, nto leyo ethintela intshukumo yokuphuma kwezinto kunye namandla okwandisa.

Iiprecipitates ezincinci zisebenza njengezithintelo ekushukumeni kokushukuma, nto leyo ephucula kakhulu ubulukhuni kunye namandla okuxinana kwezinto ngelixa zigcina iimpawu zazo zokumelana nokugqwala.

Iintlobo eziqhelekileyo zoKuqiniswa kweNsimbi engagqwaliyo

Kukho iintlobo ezahlukeneyo zentsimbi engagqwaliyo ye-PH, nganye inokwakheka kwayo, iimpawu zayo zoomatshini, kunye nokusetyenziswa kwayo. Ezona zixhaphakileyo ziquka:

• 17-4PH (UNS S17400)– Iqulethe malunga ne-17% ye-chromium kunye ne-4% ye-nickel kunye nezongezo zekopolo. Inika amandla aphezulu, ukuqina okuhle, kunye nokumelana okuhle kokugqwala kwiimeko eziqinileyo nezindala.

• 15-5PH (UNS S15500)– Ifana ne-17-4PH kodwa inobunzima obungcono kunye neempawu eziphuculweyo zoomatshini abanqamlezayo.

• 17-7PH (UNS S17700)– Yaziwa ngokukhula kwayo kakuhle kwimeko efakwe i-anneal kunye namandla aphezulu emva kokuqina kwemvula.

• 13-8Mo (UNS S13800)– Inika ukuqina okugqwesileyo, ukumelana nokugqwala, kunye namandla aphezulu, asetyenziswa rhoqo kwimizi-mveliso yeenqwelo moya kunye neyenyukliya.

Iipropati eziphambili ze-PH Stainless Steels

1. Amandla aphezulu– Ingafikelela kumandla okutsalwa angaphezulu kwe-1000 MPa emva konyango lobushushu.

2. Ukumelana nokugqwala okugqwesileyo– Ifana nentsimbi engagqwaliyo engama-304 okanye engama-316 kwiindawo ezininzi.

3. Ukuqina Okulungileyo– Igcina ukumelana neempembelelo nokuba ikwizinga eliphezulu lobunzima.

4. Uzinzo olunemilinganiselo– Ukuphazamiseka okuncinci ngexesha lokuqina, okwenza ukuba ifaneleke kwiindawo ezichanekileyo.

5. Ukumelana nokunxiba– Ifanelekile usetyenziso olunokukhuhlana nokukrweleka.

Inkqubo Yonyango Lobushushu Ngokweenkcukacha

Inkqubo yokunyanga ubushushu kwiintsimbi ezingenasici ze-PH inokwenziwa ngendlela yokuba ifikelele kumanqanaba athile okuqina kunye nokuqina.

1. Isisombululo sokuNgcwaba– Ukufudumeza ukuya kwi-1020–1060°C ukuze kunyibilikiswe izinto ezixutyiweyo zibe sisisombululo esiqinileyo esifanayo.

2. Ukupholisa Okukhawulezileyo (Ukucima)– Ngokwesiqhelo kuyacinywa umoya okanye ioyile ukuze kugcinwe isisombululo esiqinileyo.

3. Ukwaluphala (Ukuna kwemvula)– Ukuphinda kufudumale kumaqondo obushushu aphakathi kwama-480–620°C kangangexesha elithile, okuvumela ukuba kubekho ukuhla okufana neekhompawundi zekopolo okanye ii-intermetallic phases.

Ngokulungisa ubushushu bokwaluphala kunye nexesha, iinjineli zinokulungisa iipropati zoomatshini. Umzekelo, ukuguga kumaqondo obushushu aphantsi kudla ngokubangela ubulukhuni obukhulu, ngelixa amaqondo obushushu aphezulu okuguga anokunyusa ubulukhuni.

Usetyenziso lwePrecipitation Hardening Stainless Steel

Iintsimbi ezingenasici ze-PH zisetyenziswa kakhulu kumacandelo ahlukeneyo ngenxa yeempawu zazo ezilinganayo.

• Ishishini leenqwelo-moya– Izinto ezikwisakhiwo, izinto ezikwigiya yokufikela, kunye nezinto ezikwiinjini ezifuna umlinganiselo ophezulu wamandla nobunzima.

• Ishishini leeLwandle– Iishafti zepropeller, izibophelelo, kunye nezinye izinto ezivezwe emanzini olwandle.

• Ioyile kunye neGesi– Izixhobo zevalvu, imingxunya yokumpompa, kunye nezixhobo zomngxuma ongaphantsi komhlaba ekufuneka zinyamezele uxinzelelo oluphezulu kunye neendawo ezingcolisayo.

• Ukucubungula iikhemikhali– Iinqanawa ze-reactor, izixhobo zokuxuba, kunye nezixhobo ezifuna ukumelana neekhemikhali ezibolayo.

• Ukhuselo kunye neMipu– Iibharele zezibhamu, iibhloko zebhuleki, kunye nezinye izinto ezinoxinzelelo oluphezulu.

• Izixhobo zonyango– Izixhobo zotyando, izixhobo zamathambo, kunye nezinto ezifakelwayo ezifuna amandla kunye nokuhambelana kwezinto eziphilayo.

Iingenelo zokusebenzisa iintsimbi ze-PH ezingatyiwayo

1. Amandla Afana Neentsimbi Ze-Alloy– Iintsimbi ezingenasici ze-PH zihlala zilingana okanye zigqitha amandla eentsimbi ze-alloy, kodwa zinokumelana nokugqwala okungcono.

2. Iindleko Zokulungisa Ezincitshisiweyo– Ukumelana nokugqwala okugqwesileyo kunciphisa isidingo sokufakelwa izinto zokukhusela okanye ukutshintshwa rhoqo.

3. Izisombululo eziKhaphukhaphu– Amandla aphezulu avumela ukuncipha kobukhulu obunqamlezileyo, ukunciphisa ubunzima ngaphandle kokuphazamisa ukusebenza.

4. Ukuguquguquka kwemisebenzi kwiMveliso– Ingacukucezwa ngomatshini ikwimeko eqhotsiweyo ize iqiniswe kamva.

5. Ubomi beNkonzo ende– Igcina iipropati ngokuhamba kwexesha, nokuba zikwimeko enzima.

Imida kunye nezinto eziqwalaselwayo

Nangona ziluncedo, iintsimbi ezingenasici ze-PH nazo zinemida:

• Ixabiso– Ngokwesiqhelo ibiza kakhulu kuneentsimbi ezisetyenziswa ngokungatyiwayo.

• Imida yoBushushu– Amandla anokwehla xa amaqondo obushushu ehlala ehleli engaphezulu kwama-300°C.

• Ukuxinana– Amanye amanqanaba angadinga unyango lobushushu emva kokuwelda ukuze kubuyiselwe iimpawu zoomatshini.

Ukuthelekiswa neentsimbi ezingasebenziyo ze-Austenitic kunye ne-Martensitic