Lub hauv paus ntawm kev txiav txim siab yog tias cov khoom tsim nyog rau kev tiv thaiv overheating tawg yog los ntsuas nws cov microstructure stability, grain ciam zog, thiab tsis kam mus rau siab -kub oxidation. Qhov no tuaj yeem txiav txim siab los ntawm kev ntsuam xyuas dav siv los ntawm kev tshuaj xyuas metallographic, kuaj tshuaj lom neeg muaj pes tsawg leeg, thiab ntsuas thermal stability.
1. Kev ntsuam xyuas Metallographic Microstructure (Key Indicators)
Fine thiab Uniform Grains: Cov qoob loo zoo tagnrho yuav tsum nyob nruab nrab ntawm 5 thiab 8 (raws li GB / T 6394). Fine grains zoo disperse kev nyuaj siab thiab inhibit grain ciam swb.
Tsis muaj Cov Nroj Tsuag Nroj Tsuag Nroj Tsuag Oxidation: Nyob rau hauv lub tshuab tsom iav, cov ciam teb ntshiab yam tsis muaj lub network dub oxide qhia tau tias cov khoom tsis tau ua ntej thermal puas.
Dispersed Carbide Distribution: Uniform nag lossis daus ntawm nplua carbides tuaj yeem "pin" thaj tsam ntawm cov nplej, tiv thaiv kev loj hlob ntawm cov qoob loo ntawm qhov kub thiab txias.
Tswv yim pom zoo: Ua qhov kev kuaj xyuas metallographic ntawm cov khoom siv tshiab, tsom rau qhov sib xws ntawm microstructure ntawm tshav kub- thaj tsam cuam tshuam thiab cov tub ntxhais.
2. Chemical Composition thiab Purity Analysis
Element/Indicator Overheat Resistance Requirements Piav Qhia
Ti, V, Nb Microalloying Elements Cov ntsiab lus Ntau dua lossis sib npaug rau 0.05% Cov ntaub ntawv ruaj khov precipitates, inhibits grain ciam diffusion
O, S, P Impurity Cov ntsiab lus O Tsawg dua lossis sib npaug li 15 ppm, S / P Tsawg dua lossis sib npaug li 0.01% Txo qhov kev pheej hmoo ntawm kev suav nrog -induced cracking
Cr, Mo Cov ntsiab lus Cr: 4.5-5.5%, Mo: 1.0-1.5% Sib npaug oxidation tsis kam thiab microstructure stability
Txoj kev kuaj pom zoo: Siv Optical Spectroscopy (OES) + Oxygen thiab Nitrogen Analyzer kom ntseeg tau tias muaj pes tsawg leeg ua tau raws li cov qauv.
3. Kev Tshawb Fawb Kev Tshawb Fawb Kev Tshawb Fawb
High Temperature Holding Test: Kub cov qauv mus rau 1100℃thiab tuav 2 teev, ces cua txias, ua raws li kev soj ntsuam metallographic;
Kev Txiav Txim Siab: Tsis muaj qhov ciam teb oxidation lossis remelted spheres; Grain coarsening qib Tsawg dua lossis sib npaug rau qib qub + 1 qib; Hardness hloov tsawg dua los yog sib npaug rau 5 HRC.
Kev txheeb xyuas kev ntseeg siab: Cov ntaub ntawv xws li PM-H13 thiab H13+Ti tswj cov microstructure ruaj khov nyob rau hauv cov xwm txheej no.
4. Cov qauv xaiv cov khoom siv tiag tiag
|
Hom khoom |
Kev pom zoo |
Yog vim li cas |
|
Hmoov Hlau Hlau (PM{0}}H13) |
Pom zoo heev |
Zoo heev microstructure, muaj zog tiv thaiv overheating |
|
Microalloyed hlau (H13+Ti/V/Nb) |
Pom zoo |
Precipitated theem pinning grain ciam teb, nruab nrab nqi |
|
Ordinary H13 Steel (Tsis yog-ESR) |
Tsis pom zoo |
Yooj yim rau grain ciam oxidation, muaj kev pheej hmoo siab |
|
Nickel{0}}raws li Alloys (xws li Inconel 718) |
Muaj rau cov xwm txheej tshwj xeeb |
Tus nqi siab, tsuas yog siv nyob rau hauv ultra- kub kub xwm txheej |
Txoj Cai Kev Nyab Xeeb: Cov khoom zoo yog thawj kab ntawm kev tiv thaiv thiab yuav tsum tau tswj los ntawm peb qhov -pronged mus kom ze ntawm "composition + microstructure + kev ua tau zoo".
