Qib sib npaug: 18Ni300, Maraging 300, C300, 3J33, martensitic aging steel
Maraging yog ib tug series ntawm martensitic aged steels nrog ib tug npib tsib xee cov ntsiab lus ntawm 18 feem pua thiab txhim kho cov khoom los ntawm kev ntxiv ntawm cobalt. Cov qib steel hauv cov koob no muaj cov khoom siv zoo heev, kev ua haujlwm, thiab kev kho cua sov.
Maraging300 yog lub zog muaj zog heev raws li cov pa roj carbon dawb (lossis micro carbon) martensite uas tuaj yeem tsim cov dej sib xyaw ua ke los nag lossis daus thaum laus. Tsis zoo li cov hlau muaj zog ib txwm muaj, nws tsis tas yuav tsum muaj cov pa roj carbon monoxide, tab sis tso siab rau qhov tawg thiab nag lossis daus ntawm intermetallic tebchaw rau kev ntxiv dag zog. Qhov no muab nws qee yam khoom tshwj xeeb: siab zog thiab toughness, qis hardening Performance index, zoo formability, yooj yim kev kho cua sov txheej txheem, yuav luag tsis muaj deformation thaum laus, thiab zoo heev vuam kev kawm. Yog li ntawd, martensitic aging steel tau dav siv nyob rau hauv departments uas yuav tsum tau tus yam ntxwv no.
Txheej txheem ntau lawm:
Cov txheej txheem tseem ceeb muaj xws li smelting, kub ua, txias ua, vuam, kho cua sov, thiab kho qhov chaw.
Smelting:
Ob lub tshuab nqus tsev smelting txheej txheem ntawm lub tshuab nqus tsev induction rauv melting thiab lub tshuab nqus tsev consumable furnace remelting feem ntau yog saws. Rau cov qib steel nrog lub zog qis dua 1500MPa, tsis siv lub tshuab nqus tsev los yog lub tshuab nqus tsev vacuum nrog cov txheej txheem electroslag remelting. Txawm li cas los xij, rau cov qib steel nrog lub zog siab thiab cov ntawv thov tseem ceeb, cov txheej txheem nqus ob lub tshuab nqus tsev yuav tsum tau txais. Thaum lub tshuab nqus tsev noj nws tus kheej remelting, tam sim no thiab molten pas dej ua ke yuav tsum nruj me ntsis tswj kom tsis txhob hnyav dendritic segregation ntawm cov hlau ingot.
Kub ua haujlwm:
Maraging steel muaj cov khoom zoo thermoplastic ntawm qhov kub thiab txias, thiab nws cov kev ua haujlwm kub yog qhov zoo ib yam li ntawm 1Crl8Ni9Ti. Rau cov qib steel nrog siab titanium thiab molybdenum cov ntsiab lus, microsegregation ntawm cov ntsiab lus yog nquag tshwm sim thaum lub sij hawm ingot solidification, thiab anisotropic banded microstructures yog tsim tom qab kub ua hauj lwm. Qhov kev ntsuas zoo los txo lossis tshem tawm cov microsegregation yog xaiv qhov tsim nyog ingot loj thiab ua kom muaj kev kub siab txaus homogenization thaum ua haujlwm kub. Txhawm rau tiv thaiv qhov kub thiab txias qeeb qeeb los ntawm nag lossis daus ntawm Ti (C, N) thiab lwm cov tebchaw raws li austenite lis ciam teb, nws yog ib qho tsim nyog kom tsis txhob ua kom txias txias los yog nyob rau hauv qhov kub ntawm 1100 ~ 750C rau lub workpiece. tom qab ua kub. Txhawm rau kom tau txais cov nplej zoo thiab cov khoom siv kho tshuab zoo dua, qhov kawg forging yuav tsum ua kom tiav ntawm qhov kub thiab txias (950-850C) nrog rau qhov loj deformation (ntau dua 25 feem pua).
Ua haujlwm txias:
Kev ua haujlwm txias ua haujlwm tau zoo heev nyob rau hauv lub xeev kev daws teeb meem. Kev kos duab, txias dov, dabtsi yog khoov, sib sib zog nqus kos duab thiab lwm yam kev ua haujlwm yog txhua yam yooj yim ua. Kev ua haujlwm hardening Performance index ntawm steel yog 0.02-0.03, uas yog ib qho kev txiav txim siab qis dua li cov hlau zoo tib yam. Yog li ntawd, thaum lub sijhawm ua haujlwm, kev ua haujlwm txias nrog lub deformation ntawm ntau dua 90 feem pua tuaj yeem ua tiav yam tsis xav tau softening thiab annealing.
Vuam:
Zoo weldability yog ib qho zoo ntawm maraging steel. Yuav luag tag nrho cov txheej txheem vuam siv tau. Qhov sib xyaw ntawm cov hlau vuam yog qhov tseem ceeb tib yam li cov hlau welded, thiab tsis tas yuav tsum tau preheat ua ntej vuam. Yog tsis muaj kev kho mob tom qab vuam, yuav tsis muaj kab nrib pleb. Tom qab kev laus ncaj qha, qhov sib koom ua ke tuaj yeem tshaj 90 feem pua.
Kev kho cua sov:
Cov txheej txheem kev kho cua sov yooj yim yog lwm qhov tseem ceeb ntawm martensitic aging steel. Tom qab ua haujlwm kub, Maraging300 yuav tsum tau kho cov kev daws teeb meem ua ntej ua haujlwm txias thiab kev laus zog. Lub hom phiaj yog kom yaj cov seem seem tom qab ua haujlwm kub.
Tshuaj muaj pes tsawg leeg ntawm Maraging martensitic aging steel:
Kev kho cua sov ntawm Maraging martensitic aging steel:
Cov kua dej kub yog 815-830 degree, roj txias lossis cua txias (lub sijhawm cua sov: ntsev da dej rauv 1min/mm, cua sov 2-2.5min/mm), thiab hardness yog 28HRC.
Kev laus kub ntawm Maraging250 thiab Maraging300 steel yog 480 degree, tuav lub sij hawm yog 3 teev, thiab hardness yog 43HRC; Rwb thaiv tsev rau 6 teev, nrog lub hardness ntawm 52HRC.
Kev laus kub ntawm Maraging350 steel yog 510 degree, lub sij hawm laus yog 6 teev, thiab hardness yog 57-60HRC.
Nitriding kev kho ntawm Maraging martensitic aging steel:
Gas nitriding txheej txheem rau Maraging300 steel:
Nitriding kub yog (455 ± 10) degree, thiab lub sij hawm rwb thaiv tsev yog 24-28 teev.
