Kev txiav txim siab yog tias cov khoom muaj kev tiv thaiv rau cov qoob loo loj hlob feem ntau yog nyob ntawm nws cov tshuaj muaj pes tsawg leeg, cov yam ntxwv ntawm microstructure, thiab siab - qhov kub thiab txias. Qhov no tuaj yeem ntsuas los ntawm peb qhov tseem ceeb hauv qab no:
1. Chemical Composition Analysis: Muaj Cov Ntsiab Cai Microalloying
Ti (Titanium), Nb (Niobium), V (Vanium): Cov ntsiab lus no tsim cov carbides ruaj khov heev (xws li TiC, NbC, VC), uas pin cov ciam teb ntawm qhov kub thiab txias, cuam tshuam cov qoob loo loj hlob.
Al (Aluminium): Los ntawm deoxidation, nws tsim ib qho kev faib tawm AlN, tiv thaiv austenite grain coarsening thaum cua sov, lub cim ntawm "intrinsically fine-grained steel."
W (Tungsten), Mo (Molybdenum): Cov no ua rau siab -melting- taw tes carbides (xws li WC, Mo₂C), txhim kho thermal stability ntawm matrix thiab ncua sij hawm grain ciam teb.
Tswv yim tswv yim: Txheeb xyuas cov ntaub ntawv pov thawj zoo los yog daim ntawv qhia muaj pes tsawg leeg. Yog tias Ti Ntau dua lossis sib npaug rau 0.015%, Nb Ntau dua lossis sib npaug rau 0.02%, V Ntau dua lossis sib npaug rau 0.1%, lossis Al Ntau dua lossis sib npaug rau 0.02%, feem ntau nws muaj kev tiv thaiv zoo rau cov qoob loo loj hlob.
2. Cov yam ntxwv ntawm Microstructure: Theem Thib Ob Particle Distribution thiab Initial Grain Size
Kev Txiav Txim Siab: Cov yam ntxwv ntawm cov khoom tiv taus cov qoob loo loj hlob
Precipitated Phase Distribution: Fine, dispersed carbide los yog nitride hais (<1μm) uniformly distributed along grain boundaries.
Initial Grain Size: Thawj cov nplej zoo (GB/T 6394 ntsuam xyuas Ntau dua lossis sib npaug rau 5, qhov zoo tshaj 8-10).
Microstructure Homogeneity: Tsis muaj cov pob zeb sib xyaw lossis cov nplej tsis txawv txav, tshwj xeeb tshaj yog tuav cov qauv zoo -grained qauv tom qab austenitization.
Txoj Kev Tshawb Nrhiav: Saib xyuas hom thiab kev faib tawm ntawm cov theem precipitated siv metallographic microscopy + zog dispersive spectroscopy (EDS), thiab ua kev txiav txim siab raws li qhov ntsuas qhov loj me.
3. High-Tsuas Ntsuas Kev Ntsuas: Kev Ntsuas Kub Kub thiab Kev Ntsuas Kev Ua Haujlwm
High-Tub Kub Tshav Kub Kub: Cov khoom siv tau ua kom sov rau 900-1100 degree, tuav rau ob peb teev, txias, thiab tom qab ntawd ntsuas qhov loj me. Yog tias cov nplej tsis coarsen heev (tseem ntau dua lossis sib npaug rau qib 5), nws qhia tau tias muaj zog tiv thaiv kev loj hlob ntawm cov nplej.
Creep thiab Durability Strength Test: Deformation tus cwj pwm yog kuaj nyob rau hauv siab -kub loads. Cov ntaub ntawv tiv taus cov qoob loo loj hlob feem ntau pom qis qis dua thiab lub sijhawm tawg ntev dua.
Thermal Cycling Simulation: Rov ua cua sov thiab txias yog ua nyob rau hauv simulated kub khiav tej yam kev mob los soj ntsuam kev ruaj ntseg ntawm microstructure thiab muaj cov muaju sib xyaw los yog Widmanstätten.
Core Mechanism: Zener Pinning Effect-Second-phase particles lub cev impede grain ciam zog txav, uas yog lub hauv paus ntsiab lus ntawm kev tiv thaiv rau grain loj hlob.
4. Cov lus pom zoo xaiv cov khoom siv
Ua ntej steels sau tias "microalloyed" lossis "intrinsically fine-grained" (eg, H13+Ti, Al-Killed H13);
Xav kom cov neeg muab khoom siv los muab cov ntaub ntawv soj ntsuam metallographic thiab cov ntawv sib xyaw kom paub meej cov ntsiab lus ntawm cov ntsiab lus tseem ceeb thiab cov thawj microstructure;
Ua cov qauv kuaj xyuas cov khoom tseem ceeb kom tsis txhob siv cov khoom siv nrog cov khoom tsis sib xws lossis cov microstructure txawv txav.
