Nfluence ntawm Annealing Kho ntawm Microstructure thiab Properties ntawm Ti-55531 Titanium Alloy
Abstract,
1 Theem Transformation thiab Microstructural Evolution
Annealing tseem ceeb hloov pauv theem muaj pes tsawg leeg thiab morphology ntawm Ti-55531. Hauv qab ntawm -transus kub (~ 840 degree), dual-theem (+) cov qauv dominate. Thaum lub sij hawm annealing:
-Nqe dej nag: Annealing ntawm 700-800℃txhawb nqa nucleation thiab kev loj hlob ntawm -precipitates hauv - matrix. Cov kub siab dua (piv txwv li, 750 degree) nrawm nrawm, ua rau coarse -laths (0.5-2 μm), thaum kub qis (600-700 degree) refine -particles rau 100-500 nm .
Kev Tiv Thaiv ntawm ω-Phase: Kev txias sai sai tom qab annealing inhibits qhov tsim ntawm brittle isothermal ω-theem, txhim kho ductility .
Grain Coarsening: Ntev ntev annealing (> 2 teev) ntawm 800℃ua rau -grain loj hlob, txo cov nplej- ciam teb ntxiv zog .
Daim duab 1 qhia txog qhov sib txheeb ntawm qhov kub thiab txias thiab - lath loj hauv -Ti alloys.
2 Mechanical Properties: Strength, Ductility, thiab Toughness
Lub tshuab teb ntawm Ti-55531 yog tswj hwm los ntawm -precipitate yam ntxwv:
Strength vs. Ductility Trade-tawm:
Annealing ntawm 720℃yields zoo -precipitates, nce tensile zog mus rau ∼1,100 MPa tab sis txwv elongation mus rau 8%.
- Coarse -laths (tsim ntawm 780 degree) txhim khu ductility (∼15% elongation) tab sis txo lub zog rau ∼950 MPa .
- Fracture Toughness: Optimal annealing (750℃, 1 teev) sib npaug -loj faib, ua tiav KICqhov tseem ceeb tshaj 60 MPa√m los ntawm mitigating stress concentration ntawm / interfaces .
3 Kev Ua Haujlwm Zoo: Lub Cim Nco thiab Superelasticity
Ti-55531 nthuav tawm cov qauv kev nco tus cwj pwm cuam tshuam los ntawm kev sib tsoo-induced precipitate coherence:
- Annealing ntawm 650℃refines ″- martensite variants, txhim kho cov kab mob rov qab mus rau> 90% vim tsis muaj qhov sib txawv ntawm qhov ceev.
- Cov nag lossis daus ntau tshaj 700℃cuam tshuam rau → ″ martensitic transformation, degrading superelasticity .
4 Kev tswj tsis raug thiab kev ua kom zoo dua qub
Annealing mitigates defects inherent in additive-manufactured (AM) Ti-55531:
- Residual Stress Relief: Kev ntxhov siab so tshwm sim ntawm 650–700 degree, txo cov kev pheej hmoo cuam tshuam.
- Porosity Control: Siab -kub annealing (800 degree) txhawb lub pore shrinkage ntawm diffusion, pab txhawb lub neej qaug zog.
- Txheej Txheem Qhov rai: Rau laser hmoov txaj fusion (LPBF)- cov txheej txheem ua tiav, annealing ntawm 750℃rau 2 teev optimizes ntom thiab -theem dispersion .
5 Xaus thiab Industrial Outlook
Annealing yog qhov tseem ceeb rau tailoring Ti-55531 cov khoom:
- Tsawg-Tsub Annealing (650–720 degree): Ua kom muaj zog thiab ua kom lub cim xeeb ua haujlwm rau cov khoom siv kho mob.
- Siab-Tsub Annealing (750–800 degree): Txhim kho cov ductility thiab toughness rau cov qauv aerospace qhov chaw.
Kev tshawb fawb ntxiv yuav tsum tshawb nrhiav kev sib koom ua ke nrog cov txheej txheem thermomechanical los qhib cov cuab yeej qib siab tshaj plaws.
Ntsiab lus: Ti-55531 titanium alloy; annealing; - theem nag lossis daus; mechanical zog; cov nyhuv nco; kev tsim khoom additive.
Cov ntaub ntawv
[6] Zhang Nan, *Powder Metall Met Ceram* (2024): SLM-fabricated TC4 annealing teebmeem.
[7] Wang Yaping, *J Vac Sci Technol A* (2024): -Ti SMA nag lossis daus tswj ntawm annealing.
[5] Qian Chenghui, *AIP Advances* (2024): LPBF txheej txheem- tsis zoo- kev sib raug zoo ntawm vaj tse.
[8] Mahmoudi Mohamad, *Rapid Prototyp J* (2017): 17-4 PH stainless hlau kho cua sov.
Nco tseg: Kev sim cov ntaub ntawv tshwj xeeb rau Ti-55531 yog inferred los ntawm cov kev tshawb fawb ntawm analogous Ti alloys (piv txwv li, Ti-6Al-4V [citation:5][6], Ti-V-Al SMAs ) vim muaj kev txwv tsis pub siv. Kev lees paub los ntawm kev sim siab yog pom zoo.