Nrog rau kev taw qhia ntawm txawv teb chaws advanced qauv, lub localization ntawm ntau yam iav steels tau coj kuv lub teb chaws cov iav steel qib mus rau theem tshiab. Cr-Mn steel los ntawm lub teb chaws Yelemees, Cr-Mo series steel los ntawm Nyiv, thiab SAE 86 steel los ntawm Tebchaws Meskas ua tau raws li qhov yuav tsum tau ua rau iav steels nrog nruab nrab thiab me me modulus. Qee lub tsheb thauj khoom siv hauv tsev siv Asmeskas qib SAE8822H steel, xws li 8t thiab 10t choj bevel iav siv SAE8822H, cov tshuaj tseem ceeb ntawm cov hlau (ntau feem pua, feem pua) yog 0.19 ~ { {11}}.25C, 0.70 ~ 1.05Mn, 0.15 ~ 0.35 Si, {{37} }.{{2{{40}}}}.75Ni, 0.35-0.65Cr, 0.30-0.40Mo. Cov ntaub ntawv ntseeg hais tias kev tswj lub hardenability yog tus yuam sij rau kev daws qhov teeb meem ntawm iav distortion. Txhawm rau txo qis kev cuam tshuam, H steel nrog Jominy hardenability bandwidth hauv qab 4HRC yuav tsum raug xaiv. Lub precision (sib cuag cheeb tsam) ntawm lub zog siv H steel tom qab kev kho cua sov yog 70 feem pua rau 80 feem pua siab dua li cov hlau zoo tib yam, thiab kev pab cuam lub neej ntev. Yog li ntawd, industrialized lub teb chaws tau ua tiav cov txheej txheem hardenability ntawm carburized alloy structural steel. Lub hardenability band yog txwv rau qhov nqaim heev (4-5HRC) raws li xav tau. 1) Thaum txiav txim nyob rau hauv lub teb chaws Yelemees, lub hardenability ntawm cov hlau yuav tsum tau nyob rau hauv lub muab ntau yam, los yog cov hlau nrog nqaim hardenability yuav tsum tau. 17CrNiM06 yog qhov tsim nyog rau kev tsim cov khoom loj-modulus thiab hnyav-ua haujlwm automotive zog. Lub ntsiab chemical Cheebtsam (mass feem, feem pua) ntawm cov hlau no yog 0.15-0.20C, 0.40-0.60Mn, 1.50-1.80Cr, 0.{{47} }.35Mo, 1.40-1.70Ni. Cov hlau no tau tsim thiab siv hauv kuv lub tebchaws. Cov ntaub ntawv ntseeg tau hais tias nyob rau hauv cov txheej txheem carburizing ntawm 17CrNiM06 steel gears, qhov txias txias tom qab carburization yog nrawm thaum cov pa roj carbon ntau nyob rau theem tom qab ntawm carburization raug txo kom tsim nyog, thiab cua txias tau hloov mus rau cua txias kom tiv thaiv kev tsim cov carbide loj. , thiab tom qab ntawd qhov kub thiab txias yog nqa tawm ntawm 630cC. Tempering yog siv los precipitate ib co alloy carbides, thiaj li yuav txo tau cov nyiaj khaws tseg austenite thaum lub sij hawm thib ob cua sov thiab quenching ntawm 820 degree, thiab thaum kawg tau ib tug zoo metallographic qauv. 2) Lub Hoobkas Austrian "Styer" hnyav-lub luag haujlwm tsheb yuav tsum muaj lub hardenability bandwidth ntawm 7HRC. 3) Japanese tsheb nruab nrab thiab hnyav hnyav, xws li "Hino" hom KB222 9t tsheb thiab "Nissan" hom CKL20DD 8t tsheb, dav siv Cr-Mo series steel, xws li SCM420H thiab SCM822H steel, rau kev sib kis gears thiab rear qag gears. 20CrMnMoH thiab 22CrMoH steels yog domestically tsim nyob rau hauv kuv lub teb chaws.
Hom hlau no muaj siab hardenability. Nyob rau hauv ib tug tej yam ntau yam, lub bending qaug zog lub neej ntawm gears tsub kom nrog lub nce hardenability. Cov ntawv nyeem tau taw qhia tias Changchun FAW pib siv 20CrMnTiH steel hauv kev tsim khoom ntawm "Jiefang" hom 9t tsheb rear qag gears. Lub hardness tsuas yog 22-24HRC, uas tsis ua tau raws li qhov yuav tsum tau ntawm cov iav kev ua haujlwm. Thaum lub tsheb siv, lub active thiab tsav bevel gears ntawm lub rear qag yog puas thaum ntxov. Yog li ntawd, Ct-Mo steel nrog hardenability ntau dua yuav tsum tau xaiv. Nws cov khoom tseem ceeb xa mus rau Nyiv SCM822H iav hlau. Lub ntsiab chemical Cheebtsam (feem ntau, feem pua ) ntawm cov hlau no yog: 0.19 ~ 0.25C, 0.55 ~ 0.9{{16} }Mn, 0.15 -0.35Si, 0.85-1.25Cr, 0.35-0.45Mo. Tom qab sib tham nrog cov hlau zeb, ib qho kev tsim tawm hauv tsev tshiab qib 22CrMoH steel tau tsim. Nws qhov hardenability Performance index yog J9=36-42HRC, uas zoo dua ua tau raws li qhov yuav tsum tau muaj ntawm lub tsheb iav. Txawm li cas los xij, cov txheej txheem kev ua haujlwm ntawm cov hlau no tsis zoo, thiab cov iav forging dawb paug tuaj yeem txiav tsuas yog tom qab isothermal annealing kho. Lub hardness yog 156-207HB, thiab cov qauv metallographic yog pro-eutectoid ferrite ntxiv rau pseudo-eutectoid pearlite. Cov hlau no muaj zog hardenability, thiab zoo tib yam normalizing yog nquag tsim granular bainite. Cov tsos ntawm granular bainite yog qhov tsis zoo rau kev txiav, uas tsis tsuas yog txo cov kev pab cuam lub neej ntawm cov cuab yeej, tab sis kuj ib txwm ua nrog cov tsos ntawm microstructure txawv txav. Vim lub inhomogeneity ntawm lub metallographic qauv, lub tshav kub kho distortion ntawm lub iav yog thaum kawg nce. 4) Cov tuam txhab tsheb hauv Asmeskas tau sim txo cov nqi tsim khoom, thiab tib lub sijhawm, txhim kho kev ntseeg siab thiab ua haujlwm ntev ntawm cov khoom, uas yuav tsum muaj kev sib luag ntawm cov khoom geometry thiab cov khoom siv tshuab. Txhawm rau txhim kho qhov sib xws ntawm cov khoom lag luam rau cov khoom siv kho cua sov, cov degree ntawm dispersion ntawm hardness tom qab quenching yuav tsum tau txo, uas yog ncaj qha ntsig txog qhov dav ntawm hardenability band ntawm hlau. Qhov sib xws ntawm lub hardness ntawm lub iav tub ntxhais yuav txo tau qhov distortion ntawm kev kho cua sov, yog li kev txhim kho cov precision ntawm lub iav thiab ua rau cov residual compressive kev nyuaj siab faib nyob rau saum npoo ntawm cov iav hniav ntau uniform. Qee lub tsheb thauj neeg Asmeskas kis tau tus mob thiab lub tsheb qag tsav bevel iav yog ua los ntawm SAE 8620 steel thiab SAFA820 steel. American SAE8620H, SAE8822H thiab lwm qib ntawm cov hlau kuj tau tsim thiab siv hauv kuv lub teb chaws (xws li Baosteel Group Shanggang No. 5 Cog, thiab lwm yam) thiab siv rau nruab nrab-lub luag haujlwm tsheb thauj khoom gears thiab rear qag. bevel iav feem.
