Muaj ntau yamqis carbon steelqhov chaw mechanical lub hom phiaj, cov txheej txheem thov tiag tiag yuav tsum muaj cov khoom siv tshuab siab.Txawm li cas los xij, hauv kev tsim khoom tiag tiag, peb feem ntau pom tias muaj cov pa roj carbon tsawg ntawm cov khoom siv banded qauv tom qab thermal ua.Xws li cov qauv banded yog steel nyob rau hauv ib tug tsis xws luag lub koom haum, thaum loj band qauv, cov neeg kho tshuab zog ntawm steel pom tseeb anisotropy, steel yeeb nkab kom txo tau lub transverse seem shrinkage ntau ntsug thiab kab rov tav cuam tshuam lub zog cuam tshuam lub zog hais txog qhov sib txawv ob, yas los yog hlau. toughness tsis tau raws li cov kev cai ntawm tus qauv.

Nyob rau hauv cov ntsiab lus carbon ntawm 0.10% ~ 0.35% ntawm cov pa roj carbon tsawg smelting pouring tom qab feem ntau mus los ntawm yas deformation (rolling, forging, thermal expansion), ua ntej ua profiles.Txawm li cas los xij, tom qab ua tiav ntawm cov pa roj carbon tsawg tsawg yooj yim kom tau raws li cov kev taw qhia deformation, tsim pearlite thiab ferrite kab zonal faib, uas yog tsim cov qauv banded.Yog vim li cas rau qhov tsim ntawm tsawg-carbon steel qhov chaw banded qauv sib txawv, summed li roughly ob yam yog vim li cas:

(1) tshwm sim los ntawm kev sib cais ntawm cov qauv band, uas yog, thaum suav nrog cov khoom siv qis carbon steel muaj qee lub sij hawm dov suav nrog raws cov kev taw qhia dov tawm mus kom yooj yim faib.Thaum txias rau qhov qis-carbon steel qhov chaw Ar3 hauv qab no, cov impurities no tau los ua eutectoid ferrite core nucleation ua eutectoid ferrite inclusions nyob ib ncig ntawm thawj tiam ntawm zonal tis daim ntawv, ces lub residual austenite lub cev mus rau hauv pearlite, pom nyob rau hauv microscope ntawm chav tsev kub, ferrite yog dawb. , greyish dub thiab pearlite, uas ua rau ib tug dawb thiab dub kab txaij, uas yog ib tug tsawg-carbon steel strip cov ntaub so ntswg deformation.

(2) cov qauv band los ntawm thermal processing kub tshwm sim los ntawm qhov tsis tsim nyog, tias cov thermal ua ntawm cov pa roj carbon tsawg tsawg kom tsis txhob forging kub thaum lub sij hawm ntawm ob-theem cheeb tsam (nruab nrab ntawm A1 thiab A3), ferrite raws cov ndlwg ntawm cov kev taw qhia. hlau los ntawm austenite zonal nag lossis daus, decomposition ntawm austenite tseem tsis tau txiav rau hauv sawb, thaum txias rau A1, lub sawb austenite rau hauv pearlite band.