Phapano ke Efe Pakeng tsa 17-4PH le Litšepe Tse Ling tsa Precipitation-Hardening (PH)?

Phapano ke Efe Pakeng tsa 17-4PH le Litšepe Tse Ling tsa Precipitation-Hardening (PH)?

Selelekela

Litšepe tse sa tsitsang tse thatafatsang pula (PH steels) ke sehlopha sa li-alloys tse hananang le kutu tse kopanyang matla a litšepe tsa martensitic le austenitic tse nang le khanyetso e ntle ea kutu. Har'a bona,17-4PH tšepe e sa hloekangha ho pelaelo hore ke eona e sebelisoang ka ho fetisisa ka lebaka la thepa ea eona e ikhethang le bonolo ba ho etsa lintho. Empa e bapisoa joang le limaraka tse ling tsa PH joalo ka 15-5PH, 13-8Mo, 17-7PH, le Custom 465? Sengoliloeng sena se kenella ka botebo liphapanong tsa sebopeho, kalafo ea mocheso, thepa ea mochini, ho hanyetsa kutu, le ts'ebeliso.

Overview of Precipitation-Hardening Stainless Steels

Litšepe tse thatafatsang pula li fumana matla a tsona ka ho theoa ha lipula tse ntle ka har'a matrix ea tšepe nakong ea kalafo ea mocheso o tsofalang. Litšepe tsena li arotsoe ka lihlopha tse tharo tse kholo:

1. Litšepe tsa Martensitic PH(mohlala,17-4PH, 15-5PH)
2. Litšepe tsa semi-austenitic PH(mohlala, 17-7PH)
3. Litšepe tsa Austenitic PH(mohlala, A286)

Sehlopha se seng le se seng se fana ka motsoako o ikhethileng oa thepa e lumellanang le litlhoko tse ikhethang tsa indasteri.

17-4PH (UNS S17400): Boemo ba Indasteri

Sebopeho:

• Kr: 15.0–17.5%
• Ke: 3.0–5.0%
• Ka: 3.0–5.0%
• Nb (Cb): 0.15–0.45%

Kalafo ea Mocheso: E alafshoa le ho tsofala (hangata H900 ho isa H1150-M)

Mechanical Properties (H900):

• Matla a Tensile: 1310 MPa
• Matla a ho Hlahisa: 1170 MPa
• Elongation: 10%
• boima: ~ 44 HRC

Melemo:

• Matla a phahameng
• Ho hanyetsa kutu e itekanetseng
• Ho sebetsa hantle
• E chesehang

Lisebelisoa:

• Likarolo tsa sepakapaka
• Lisebelisoa tsa nyutlelie
• Li-valve, li-shafts, li-fasteners

Papiso le Litšepe Tse Ling tsa PH

15-5PH (UNS S15500)

Sebopeho:

• E ts'oana le 17-4PH, empa e na le taolo e matla holim'a litšila
• Kr: 14.0–15.5%
• Ke: 3.5–5.5%
• Ka: 2.5–4.5%

Liphapang Tsa Sehlooho:

• Matla a ho feta a betere ka lebaka la sebopeho se setle sa microstructure
• Mehaho e ntlafetseng ea mechine likarolong tse teteaneng

Sebelisa Maemo:

• Lintho tse entsoeng ka sefofane
• Lisebelisoa tsa ho lokisa lik'hemik'hale

13-8Mo (UNS S13800)

Sebopeho:

• Kr: 12.25–13.25%
• Ke: 7.5–8.5%
• Mo: 2.0–2.5%

Liphapang Tsa Sehlooho:

• Matla a phahameng le ho hanyetsa kutu
• Matla a phahameng libakeng tse teteaneng tsa lifapano
• Litaolo tse thata tsa sebopeho bakeng sa tšebeliso ea sepakapaka

Sebelisa Maemo:

• Likarolo tsa sebopeho sa sefofane
• Liliba tse sebetsang hantle haholo

17-7PH (UNS S17700)

Sebopeho:

• Kr: 16.0–18.0%
• Ke: 6.5–7.75%
• Ka kakaretso: 0.75–1.50%

Liphapang Tsa Sehlooho:

• Semi-austenitic; e hloka mosebetsi o batang le kalafo ea mocheso
• Sebopeho se betere empa ho hanyetsa kutu ho tlase ho feta 17-4PH

Sebelisa Maemo:

• Li-diaphragm tsa sepakapaka
• Li-Bellows
• Lithaba

Custom 465 (UNS S46500)

Sebopeho:

• Kr: 11.0–13.0%
• Ke: 10.75–11.25%
• Tee: 1.5–2.0%
• Mo: 0.75–1.25%

Liphapang Tsa Sehlooho:

• Matla a phahameng haholo (ho fihla ho 200 ksi tensile)
• E babatsehang fracture toughness
• Litsenyehelo tse phahameng

Sebelisa Maemo:

• Lisebelisoa tsa ho buoa
• Li-fasteners tsa lifofane
• Likarolo tsa lisebelisoa tsa ho lulisa

Ho Bapisa Phekolo ea Mocheso

Corrosion Resistance Papiso

• Molemo ka ho fetisisa:13-8Mo le Custom 465
• E ntle:17-4PH le 15-5PH
• Ho lokile:17-7PH

Tlhokomeliso: Ha ho e ts'oanang le khanyetso ea kutu ea limaraka tsa austenitic ka botlalo joalo ka 316L.

Machinability le Weldability

Ho nahanela Litšenyehelo

• Theko e Ntle Haholo:17-4PH
• Mephato ea Pele:13-8Mo le Custom 465
• E leka-lekane:15-5PH

Likopo Papiso

Kakaretso

Qetello

Leha 17-4PH e ntse e le tšepe e sa hloekang ea PH bakeng sa lits'ebetso tse ngata tse akaretsang, sehlopha se seng le se seng sa PH se na le melemo e ikhethang e e etsang hore e lokele litlhoko tse itseng. Ho utloisisa li-nuances lipakeng tsa li-alloys tsena ho thusa baenjiniere ba thepa le bareki ho etsa liqeto tse nang le tsebo ho latela matla, ho tiea, ho hanyetsa kutu le litšenyehelo.