Cov kev sib raug zoo ntawm khaus khaus hardness thiab hnav tsis kam

Hnav tsis kam tsis yog tsuas yog cuam tshuam nrog cov khoom siv, tab sis kuj rau daim ntawv hnav. Cov ntaub ntawv hnav xws li hnav abrasive, hnav hnav, oxidative hnav, thiab qaug zog hnav.

1. Kev hnav tsis zoo, qaug zog hnav yog nyob ntawm qhov zoo ntawm metallurgical, xws li porosity, pores, dawb me ntsis, non-metallic inclusions, thiab lwm yam, thiab tsis muaj dab tsi ua rau hardness. Txhim kho qhov zoo ntawm metallurgical tuaj yeem txhim kho qhov qaug zog hnav tsis kam ntawm steel.

2. Nyob rau hauv cov xwm txheej ntawm abrasive hnav, lub ntsiab tseem ceeb cuam tshuam rau hnav tsis kam yog hardness thiab lub koom haum. Thaum qhov cuam tshuam load me me, qhov hnav tsis kam yog proportional rau hardness, uas yog, hardness tuaj yeem siv los ntsuas qhov hnav tsis kam. Thaum qhov cuam tshuam load loj, qhov hnav kuj tseem cuam tshuam los ntawm lub zog thiab toughness. Nyob rau lub sijhawm no, qhov chaw hardness tsis yog qhov siab dua qhov zoo dua, tab sis muaj qhov tsim nyog hardness ntau yam, thiab hnav tsis kam txo qis tom qab qhov hardness ntau dua ib qho nqi. Qhov xwm, kom muaj nuj nqis thiab kev faib tawm ntawm steel carbides muaj feem cuam tshuam rau kev hnav tsis kam.

3. Rau cov nplaum hnav, qhov xwm txheej nyuaj dua. Feem ntau, cov ntaub ntawv nkig thiab cov khoom siv melting siab yog resistant rau cov nplaum hnav. Txo qhov kev sib txhuam coefficient tuaj yeem txhim kho qhov hnav tsis kam. Cov ntaub ntawv uas muaj siab hardness pab txo cov kev sib txhuam coefficient. Hnav tsis kam yog qhov zoo, yog vim li cas.

1. Oxidative hnav feem ntau yog nyob ntawm qhov sib txawv ntawm cov hlau nto, cov khoom ntawm oxide zaj duab xis tsim, thiab lub zog sib txuas ntawm oxide zaj duab xis thiab cov substrate. Txawm hais tias hardness. Yog li ntawd, nws tuaj yeem pom tias hardness yog ze ze rau kev hnav tsis kam, tab sis nws tsis yog tib qho.