Kev tshuaj xyuas ntawm cov qauv thiab cov khoom ntawm ntau cov ntaub ntawv liner tau teev tseg saum toj no qhia tau tias cov khoom siv pob zeb liner yuav tsum muaj cov yam ntxwv hauv qab no:
(1) Txaus toughness. Liners nrog zoo toughness yuav txo tau ntawm pob txha. Qee tus ntseeg tias rau cov pob zeb me me nrog txoj kab uas hla tsawg dua 4m, qhov cuam tshuam toughness ntawm ak=6-8 J / cm² txaus. Txawm li cas los xij, txhawm rau txo qhov poob vim tsis yog - abrasive tsis ua hauj lwm los ntawm liner breakage, tus sau qhia tias qhov cuam tshuam toughness ntawm 10mm × 10mm × 5mm unnotched qauv ntawm cov ntaub ntawv liner yuav tsum ntau dua 12 J / cm².
(2) High hardness. Cov kev tshawb fawb qhia tau hais tias tom qab hnav, thaum cov khoom hardness ncav cuag 0.8 npaug ntawm hardness ntawm cov khoom abrasive, ua rau cov khoom hardness tuaj yeem txhim kho nws cov hnav tsis kam. Yog li ntawd, lub hardness ntawm cov ntaub ntawv liner yuav tsum siab tshaj HRC50. Txawm li cas los xij, kev nyuaj siab ntau dhau tuaj yeem ua rau muaj qhov brittleness, yog li nws tau pom zoo tias qhov hardness yuav tsum tsis pub tshaj HRC54.
(3) Zoo tagnrho microstructure. Qhov zoo tshaj plaws microstructure yuav tsum muaj xws li: siab -hardness alloy carbides thiab spheroidized carbide pawg. Hauv cov khoom siv hlau, siab -hardness alloy carbides feem ntau tau los ntawm kev ntxiv qee cov carbide- tsim cov ntsiab lus, uas yog ib txoj hauv kev zoo los txhim kho qhov hnav tsis kam ntawm cov khoom. Qhov no yog vim hais tias cov khoom sib xws ntawm carbides hauv matrix txo cov kev ntxhov siab nyob ib ncig ntawm cov carbides, txo txoj kev pheej hmoo ntawm kev tawg thiab tiv thaiv carbide spalling. Nyob rau tib lub sijhawm, spheroidized carbides tuaj yeem thaiv plowing hnav, txo qhov tob thiab ntev ntawm cov grooves, yog li tiv thaiv cov matrix. Yog li ntawd, nws yuav tsum tau hais tias cov alloy carbides nyob rau hauv cov khoom yuav spheroidized thiab uniformly faib. Lub matrix muaj zog thiab tawv yog xav tau los txhawb lub siab -hardness alloy carbides; txwv tsis pub, cov alloy carbides yuav yooj yim spill tawm, thiab hnav tsis kam ntawm cov khoom yuav tsis muaj zog heev. Martensite + qis bainite yog cov qauv matrix zoo heev. Lub xub ntiag ntawm ib qho me me ntawm cov austenite khaws cia txo qhov kev ntxhov siab thaum kho cua sov, txhim kho cov tawv tawv ntawm cov khoom, thiab txo qhov muaj peev xwm ntawm kev tawg thaum lub sij hawm tsim khoom thiab siv.
