Kev siv cov khoom siv high-speed steel

Cov cuab yeej siv high-speed steel feem ntau muaj ob lub ntsiab lus:Ib qho yog hlau carbide (tungsten carbide, molybdenum carbide los yog vanadium carbide), uas muab cov cuab yeej zoo dua hnav tsis kam;Qhov thib ob yog cov hlau matrix faib nyob ib ncig ntawm nws, uas ua rau cov cuab yeej muaj zog zoo dua thiab muaj peev xwm nqus tau qhov cuam tshuam thiab tiv thaiv kev tawg.
Nws pom tau hais tias cov nplej loj ntawm high-speed steel muaj kev cuam tshuam zoo rau cov khoom ntawm high-speed steel.Txawm hais tias qhov nce ntawm cov hlau carbide cov ntsiab lus hauv cov hlau tuaj yeem txhim kho qhov hnav tsis kam ntawm cov khoom siv, nrog rau cov ntsiab lus ntawm cov hlau, qhov loj ntawm carbide thiab cov agglomerates kuj yuav nce, uas yuav muaj kev cuam tshuam tsis zoo rau lub toughness. ntawm cov hlau, vim hais tias loj carbide pawg yuav sai sai no los ua qhov pib ntawm cov kab nrib pleb.Yog li ntawd, cov teb chaws txawv teb chaws tau ua cov kev tshawb fawb ntxov heev los nrhiav cov nplej zoo ntawm cov hlau ceev ceev.
Nyob rau hauv lub lig 1960s, cov hmoov metallurgy high-speed steel manufacturing txheej txheem tau ntse tsim nyob rau hauv Sweden thiab nkag mus rau hauv lub lag luam nyob rau hauv thaum ntxov 1970s.Cov txheej txheem no tuaj yeem ntxiv cov ntsiab lus alloy ntau rau hauv cov hlau nrawm yam tsis muaj kev puas tsuaj rau lub zog, toughness lossis grindability ntawm cov khoom, kom cov cuab yeej nrog siab hardness, siab hnav tsis kam, tuaj yeem nqus cov kev cuam tshuam, thiab tsim nyog rau kev ua haujlwm siab. thiab kev txiav txiav tuaj yeem ua tau.Txawm li cas los xij, nws ua ke qhov zoo toughness ntawm high-speed steel nrog lub siab hnav tsis kam ntawm cemented carbide.Vim qhov zoo thiab tsis sib xws ntawm cov carbide hais nyob rau hauv cov hmoov metallurgy high-speed steel, nws lub zog thiab toughness yog heev txhim khu kev qha piv nrog high-ceev steel nrog tib cov ntsiab lus carbide.Nrog rau qhov kom zoo dua no, hmoov metallurgy high-speed steel cov cuab yeej yog qhov tsim nyog rau lub sijhawm ua haujlwm nrog kev cuam tshuam loj thiab kev tshem tawm cov hlau siab (xws li flexure txiav, txiav txiav, thiab lwm yam).Tsis tas li ntawd, vim hais tias lub zog thiab tawv ntawm cov hmoov metallurgy high-speed steel yuav tsis muaj zog los ntawm kev nce cov ntsiab lus ntawm cov hlau carbide, steel manufacturers tuaj yeem ntxiv ntau cov ntsiab lus alloy rau cov hlau los txhim kho kev ua haujlwm ntawm cov khoom siv.Nyob rau tib lub sijhawm, vim tias tungsten (W) cov peev txheej yog cov peev txheej tsim nyog, thiab niaj hnub cemented carbides siv tungsten cov peev txheej loj, qis-tungsten high-speed steel tau dhau los ua cov kev taw qhia ntawm high-speed steel kev tshawb fawb thiab kev loj hlob.High-speed steel uas muaj cobalt (HSS-Co) tau tsim nyob rau hauv ib tug loj tus naj npawb ntawm txawv teb chaws.Tom qab ntawd, nws tau lees paub thoob ntiaj teb tias cov hlau kub ceev uas muaj cobalt nrog ntau dua 2% cov ntsiab lus cobalt yog kev ua haujlwm siab ceev hlau (HSSE).Cobalt tseem ua lub luag haujlwm pom tseeb hauv kev txhim kho kev ua haujlwm ntawm cov hlau ceev ceev.Nws tuaj yeem txhawb nqa carbides kom yaj ntau dua hauv matrix thaum quenching thiab cua sov, thiab siv cov matrix hardness los txhim kho hnav tsis kam.Lub siab ceev steel muaj zoo hardness, thermal hardness, hnav tsis kam thiab grindability.Cov ntsiab lus cobalt ntawm cov pa cobalt high-speed steel hauv ntiaj teb feem ntau yog 5% thiab 8%.Piv txwv li, W2Mo9Cr4VCo8 (American brand M42) yog tus cwj pwm los ntawm cov ntsiab lus vanadium tsawg (1%), cov ntsiab lus cobalt siab (8%) thiab kev kho cua sov hardness ntawm 67-70HRC.Txawm li cas los xij, txoj kev kho cua sov tshwj xeeb kuj tau txais kev pom zoo kom tau txais 67-68HRC hardness, uas txhim kho nws cov kev ua tau zoo (tshwj xeeb yog txiav tsis tu ncua) thiab txhim kho kev cuam tshuam toughness.Cobalt high-speed steel tuaj yeem ua rau ntau yam cuab yeej, uas tuaj yeem siv los txiav cov ntaub ntawv nyuaj rau tshuab nrog cov txiaj ntsig zoo.Vim nws txoj kev sib tsoo zoo, nws tuaj yeem ua rau cov cuab yeej nyuaj, uas yog siv thoob ntiaj teb.Txawm li cas los xij, Tuam Tshoj tsis tshua muaj peev txheej cobalt, thiab tus nqi ntawm cobalt high-speed steel yog kim, txog 5-8 npaug ntawm cov hlau zoo tib yam.