Cov txiaj ntsig ntawm kev kho cryogenic rau kev txhim kho qhov zoo ntawm cemented carbide

Txij li thaum xyoo 1980s, kev kho cryogenic tau siv los ua kom zoocemented carbide.Ntau cov kev tshawb fawb tau pom tias kev kho cryogenic muaj qhov cuam tshuam zoo rau cov khoom siv kho tshuab, hnav tsis kam, txiav kev ua haujlwm, microstructure, thiab cov kev ntxhov siab seem ntawm cemented carbide.Los ntawm kev tshawb nrhiav tsis tu ncua los ntawm cov kws tshawb fawb, tau txais cov txiaj ntsig ntawm kev ua tau zoo.thiab xaus ntawm scientific tseem ceeb.

(1) Kev kho Cryogenic tuaj yeem txhim kho lub zog khoov, hnav tsis kam thiab kev ua haujlwm ntawm kev txiavcemented carbide, yog li zoo ncua lub neej kev pab cuam ntawmcemented carbide cov cuab yeej.Los ntawm kev txheeb xyuas qhov cuam tshuam ntawm cov txheej txheem kev kho cryogenic tsis nyob ntawm cov khoom siv ntawm cov cemented carbide, nws ntseeg tau tias qhov kev ua kom zoo tshaj plaws ntawm kev kho cryogenic tsis hloov linearly nrog qhov txo qis ntawm kev kho cua sov thiab ncua sij hawm tuav.Rau cov qib tshwj xeeb ntawmcemented carbide, muaj cov txheej txheem kho cryogenic zoo, uas tuaj yeem ua tiav cov txiaj ntsig zoo tshaj plaws ntawm tus nqi qis.

(2) Cov teebmeem tseem ceeb ntawm kev kho cryogenic ntawm microstructure ntawmcemented carbideyog: ① hloov cov nplej morphology ntawm cov theem nyuaj - WC;② txhawb kev hloov pauv ntawm martensitic ntawm kev sib txuas;③ nplua carbide hais (eta theem) hauv Dispersed thiab precipitated ntawm cov khoom matrix.

(3) Kev hloov pauv martensite ntawm kev sib txuas, nag lossis daus ntawm cov carbide zoo thiab qhov nce ntawm qhov seem compressive kev nyuaj siab ntawm cov khoom nto tom qab kev kho cryogenic tuaj yeem txhim kho lub zog thiab hnav tsis kam ntawm cemented carbide.Yog li ntawd, kev txhim kho ntawm cov khoom macroscopic ntawm cemented carbide yog qhov tshwm sim ntawm kev sib xyaw ua ke ntawm theem kev hloov pauv kom muaj zog thiab muaj zog ntxiv.