Vim muaj zog toughness ntawm cov khoom sib xyaw ntawm siab manganese thiab alloy steel, hnav-resistant alloy nrog lub zog hardness tuaj yeem surmounted rau saum npoo, kom lub zog saum npoo ntawm lub thoob hniav zoo heev, thiaj li tau txais ntau dua. zoo tagnrho thoob hniav.Vim tias nws muaj cov ntsiab lus muaj zog hauv cov txheej txheem ntawm drought tsis kam, overlay vuam alloys nrog siab hardness thiab zoo hnav tsis kam yuav tsum tau xaiv nyob rau hauv cov khoom.
Raws li cov kev tshawb fawb tseem ceeb, cov hlau alloy siab muaj zog hnav tsis kam tshaj li cov khoom siv hlau manganese siab, thiab cov hlau hlau siab lossis martensitic cam khwb cia hlau alloy yog siv los tsim cov thoob cov hniav tshiab thiab kho cov hniav qub.Thaum kho cov kev kho mob, cov nplaim acetylene tuaj yeem raug txiav los ntawm qhov kawg ntawm lub thoob cov hniav qub, tawm hauv ib qho zawj, thiab tom qab ntawd siv austenitic steel manganese vuam pas nrig los ua cov kev kho mob ntawm thawj daim ntawv, thiab thaum kawg overlay vuam kev kho ntawm qhov chaw. los txhim kho qhov hnav tsis kam ntawm cov excavators loj hauv mines.

Ua ntej, txiav mechanism
Thaum lub thoob cov hniav reacts nrog pob zeb (ore) nyob rau hauv siab load, ntawm ib sab, nws yog nyob rau hauv kev sib cuag nrog lub pob zeb (ore) nto thiab tsim ib tug loj cuam tshuam quab yuam, yog hais tias lub yield zog ntawm lub thoob cov hniav yog tsawg, lub hau ntawm lub thoob cov hniav tsim ib qho yas deformation, uas yog ib qho yooj yim los tsim cov yas furrow.Ntawm qhov tod tes, thaum lub thoob cov hniav tso rau hauv cov pob zeb (ore), yog tias qhov hardness ntawm lub thoob cov hniav yog qis dua qhov hardness ntawm pob zeb (ore), cov pob zeb (ore) hais raug thawb mus rau saum npoo ntawm cov hniav. thoob cov hniav, uas yuav tsim cov chips ntev nyob rau hauv cov duab ntawm ib tug nkhaus los yog kauv, tsim ib tug txiav zawj, uas tej zaum yuav nrog micro txiav chips.Chip vim shear nkaus thiab ntau tus deformation, tsim ib tug loj npaum li cas ntawm deformation latent tshav kub, tshwm nyob ze thiab zoo huv si txheej txheem slip kauj ruam, tsim wrinkles, ntxiv rau, nws cov kev sib txhuam nrog pob zeb (ore) los tsim kev sib txhuam kub, deformation. latent tshav kub thiab kev sib txhuam kub ua ke ua rau cov nti kub nce sharply, dynamic recrystallization, tempering softening, dynamic theem hloov, thiab lwm yam., hloov lub internal qauv ntawm lub nti, ib co kuj tshwm sim hauv zos melting tshwm sim.
Thib ob, qaug zog peeling mechanism
Cov hniav thoob yog muab tso rau hauv pob zeb (ore) kom rov ua dua, thiab cov yas plough trench tsim nyob rau saum npoo yog crushed los ntawm pob zeb hais ntawm lub uplift rau ntau zaus, uas tuaj yeem tsim ib lub rooj hlau ntau, thiab tawg thiab tawg tawg. yuav raug tsim tawm thaum qhov kev ntxhov siab ntawm cov khoom siv thoob hniav ntau tshaj qhov txwv lub zog.Thawj yog tawg perpendicular mus rau kev coj coj, thiab lwm yam yog tawg los yog torn down lub coj kev coj, nrog du grooved kab txaij nyob rau hauv pem hauv ntej sab, flatter nyob rau tom qab, thiab overlapping kab txaij tsim los ntawm crushing deformation ntawm ob sab.Yog hais tias lub pob zeb yog angular, nws yuav shear lub deformation txheej thiab tsim cov khib nyiab, uas yog tiaj tus thiab flake nrog ntxhib npoo.Kuj tseem muaj qhov xwm txheej, thaum lub thoob cov hniav thiab cov pob zeb rov ua dua, lub thoob cov hniav yas deformation thiab ua rau muaj kev ua haujlwm siab tawv, kom cov hniav nto ntawm lub thoob cov hniav yog nkig, nyob rau hauv qhov muaj zog ntawm cov pob zeb, hniav saum npoo yuav tsim nkig chips, thiab nws nto muaj radial tawg ntawm qhov tob sib txawv.Qhov no nkig cracking yam ntxwv kuj yog nruj me ntsis ib tug qaug zog flaking mechanism.Qhov hnav tsis ua hauj lwm mechanism muaj feem xyuam rau cov khoom thiab kev ua hauj lwm tej yam kev mob, feem ntau xws li txiav, qaug zog tev thiab lwm yam mechanisms.Feem ntau hais lus, cov txheej txheem txiav dominates hnav tsis ua hauj lwm txheej txheem ntawm lub thoob cov hniav, ncav cuag ntau tshaj 7O;Nrog rau qhov nce ntawm hardness ntawm lub thoob cov hniav, qaug zog tev mechanism maj mam nce, accounting rau 2O ~ 3O;Thaum lub hardness ntawm cov khoom mus txog rau sab sauv txwv, lub brittleness nce thiab brittle chipping yuav tshwm sim.Rau cov kev ua haujlwm uas tau tswj hwm los ntawm kev txiav cov txheej txheem, kev txhim kho cov tawv tawv ntawm lub thoob cov hniav yog qhov zoo rau kev txhim kho nws cov hnav tsis kam;Rau kev qaug zog tev tawm, cov khoom siv yuav tsum muaj qhov zoo thiab tawv tawv;Siab hardness, siab tawg toughness, tsis tshua muaj kev loj hlob tus nqi thiab muaj feem xyuam rau qaug zog tiv thaiv tag nrho cov pab txhim kho cov hnav tsis kam ntawm cov ntaub ntawv.