1. Microstructural Basis rau cov khoom sib txawv
Inconel 625 yog npib tsib xee-chromium-molybdenum-niobium superalloy muaj zog feem ntau los ntawm kev daws teeb meem ntxiv zog los ntawm Nb, Mo, thiab Cr. Nws tsis tsim ib feem loj ntawm coherent '(Ni₃Al/Ti) lossis ″ (Ni₃Nb) theem zoo li Inconel 718. Xwb, kev laus ua rau nag lossis daus ntawm:
δ theem (Ni₃Nb): Ib rab koob-zoo li lossis phaj-zoo li theem intermetallic uas tsim ntawm qhov kub ntawm 650-900 degree.
Me me ntawm carbide (piv txwv li, NbC, TiC).
Theem δ yog qhov tseem ceeb rau kev hloov pauv khoom vaj khoom tsev thaum laus.
2. Tensile Properties
Solution-Annealed Condition
High ductility (elongation feem ntau 30-40%).
Lub zog nruab nrab (yield zog ~ 300-450 MPa, qhov kawg tensile zog ~ 800-950 MPa, nyob ntawm seb qhov loj npaum li cas).
Tsawg ua hauj lwm hardening tus nqi piv rau cov laus cov ntaub ntawv.
Hnub nyoog mob
Kev laus ntawm 650-900℃nce lub zog tab sis txo ductility:
Lub zog tawm los nce (feem ntau los ntawm 20-60%) vim yog δ-theem nag lossis daus thiab dislocation pinning.
Qhov kawg tensile zog kuj nce, tab sis qhov nce yog tsawg pronounced tshaj nyob rau hauv yield zog.
Elongation txo qis (tej zaum yuav poob mus rau 15-25%).
Qhov tseeb qhov tseem ceeb nyob ntawm qhov kev laus tsis. Piv txwv li:
Lub sij hawm luv luv ntawm kev laus ntawm 700℃tuaj yeem ua rau muaj zog me ntsis ntxiv nrog kev poob qis tsawg.
Kev laus lub sij hawm ntev ntawm 850℃yuav ua rau muaj qhov tseem ceeb δ-theem coarsening, txo lub zog thiab toughness.
3. Hardness
Solution-annealed: Feem ntau HB 190–230.
Hnub nyoog: Hardness nce ntau, feem ntau mus rau HB 250-320, nyob ntawm seb muaj kev laus.
Qhov kev nce no ncaj qha ntsig txog δ-theem nag lossis daus.
4. cuam tshuam toughness
Solution‑annealed: High toughness (Charpy V‑notch values often >150 J).
Aged: Toughness decreases, especially after prolonged aging at higher temperatures (>750 degree), vim yog δ-phase embrittlement thiab grain ciam teb nag lossis daus.
Rau cov ntawv thov uas yuav tsum tau muaj zog toughness (xws li, siv cryogenic), qhov kev daws teeb meem yog qhov zoo dua.
5. Creep thiab Stress-Rupture Properties
Solution-annealed: Zoo creep kuj vim muaj zog-solution ntxiv zog, tab sis tsis zoo nyob rau hauv nruab nrab kub (600-800 degree).
Hnub nyoog: Lub xub ntiag ntawm δ theem tuaj yeem ua rau muaj kev tawm tsam ntawm qee qhov kub los ntawm kev cuam tshuam kev txav mus los. Txawm li cas los xij, ntau dhau los yog ntxhib δ theem tuaj yeem txo qis lub zog nkag mus ntev.
Qhov zoo tshaj plaws creep zog yog feem ntau ua tiav nrog kev tswj kev laus uas sib npaug δ-phase loj thiab kev faib tawm.
6. Kev qaug zog
Solution-annealed: Feem ntau zoo dua qaug zog tawg kev loj hlob tsis kam vim muaj ntau dua ductility thiab tsawg dua embrittling theem.
Hnub nyoog: Lub zog siab dua tuaj yeem txhim kho lub voj voog qaug zog (HCF) tsis kam, tab sis kev qaug zog tawg tuaj yeem nce ntxiv yog tias theem δ txhawb kev tawg tawg.
Cov nyhuv net nyob ntawm daim ntawv thov thiab kev thauj khoom.
7. Corrosion thiab Oxidation Resistance
Inconel 625 qhov zoo heev corrosion kuj tau txais los ntawm nws cov ntsiab lus Cr thiab Mo, uas tsis cuam tshuam los ntawm kev laus. Yog li ntawd:
Corrosion kuj zoo ib yam nyob rau hauv ob qho tib si.
Txawm li cas los xij, kev laus ntau dhau tuaj yeem ua rau nag lossis daus ntawm cov ciam teb, uas tuaj yeem ua rau muaj kev cuam tshuam rau intergranular corrosion hauv qee qhov chaw.
8. Cov ntsiab lus siv tau
Kev daws teeb meem-annealed Inconel 625 yog siv thaum muaj ductility, toughness, thiab weldability yog ib qho tseem ceeb (xws li, tshuaj ua, cryogenic Cheebtsam).
Aged Inconel 625 yog siv thaum xav tau lub zog siab dua ntawm qhov nruab nrab qhov kub thiab txias (xws li, qee cov khoom siv hauv aerospace, cov khoom siv roj thiab roj av).
