Qhov txias brittleness (los yog qis-kub embrittlement nyiam) ntawmtxias dov tubesThaum siv yog sawv cev los ntawm toughness brittleness hloov pauv kub Tc.Tc ntawm high-purity hlau (0.01% C) yog nyob rau ntawm -100C, thiab hauv qab no kub, nws yog kiag li nyob rau hauv ib tug nkig lub xeev.Feem ntau cov ntsiab lus hlau nyob rau hauv txias-kuav los tiag precision ci steel kav ua rau kom lub toughness brittleness hloov kub ntawm txias-dov precision ci steel kav, ua rau cov nyiam txias brittleness.Thaum cov pob txha tawg tshwm sim saum toj no hauv chav tsev kub, qhov tawg ntawm qhov txias-dov precision ci steel kav yog ib qho zoo li cov pob txha tawg, thaum lub pob txha tawg tshwm sim ntawm qhov kub thiab txias, nws yog qhov tawg tawg.
Yog vim li cas rau qis-kub embrittlement ntawm txias dov ci raj yog:
(1) Thaum lub dislocations generated los ntawm dislocation qhov chaw thaum lub sij hawm deformation yog thaiv los ntawm obstacles (xws li grain ciam teb los yog thib ob equivalences), lub zos kev nyuaj siab tshaj lub theoretical zog ntawm txias-dov precision ci steel kav, uas ua rau microcracks.
(2) Ob peb stacked dislocations tsim ib tug microcrack ntawm lub grain ciam teb.
(3) Cov tshuaj tiv thaiv ntawm kev sib tshuam ntawm ob txoj hlua khi, ua rau kev txav tsis taus% 26lt;010% 26gt, nrog lub ntsej muag zoo li microcrack uas tuaj yeem tawg raws lub dav hlau cleavage.
Cov yam tseem ceeb cuam tshuam rau qhov txias brittleness ntawm txias dov ci raj muaj xws li:
(1) Cov tshuaj tiv thaiv kom muaj zog ntxiv.Phosphorus tsub kom lub toughness brittleness hloov kub ntau zog;Tseem muaj molybdenum, titanium, thiab vanadium;Thaum cov ntsiab lus qis, cov nyhuv tsis tseem ceeb, thaum cov ntsiab lus siab, cov ntsiab lus uas ua rau kom muaj zog brittleness hloov kub muaj xws li silicon, chromium, thiab tooj liab.Cov ntsiab lus uas txo qhov toughness brittleness hloov pauv kub muaj xws li npib tsib xee, thiab cov ntsiab lus uas ua ntej txo qis thiab tom qab ntawd ua kom cov tawv nqaij brittleness hloov kub muaj xws li manganese.
(2) Cov ntsiab lus uas tsim rau theem ob.Lub ntsiab tseem ceeb tshaj plaws rau kev ua kom txias brittleness ntawm txias-dov precision ci steel kav nrog theem ob yog carbon.Raws li cov ntsiab lus carbon nyob rau hauv txias dov precision ci steel kav nce, cov ntsiab lus pearlite nyob rau hauv txias dov precision ci steel kav nce.Qhov nruab nrab, rau txhua txhua 1% nce nyob rau hauv pearlite ntim, lub toughness brittleness hloov kub nce los ntawm 2.2 ℃ nyob rau nruab nrab.
(3) Cov nyhuv ntawm cov ntsiab lus carbon ntawm brittleness hauv ferritic pearlite hlau.Qhov sib ntxiv ntawm microalloying ntsiab xws li titanium, niobium, thiab vanadium cov ntaub ntawv dispersed nitrides los yog carbonitrides, ua rau ib tug nce nyob rau hauv lub toughness brittleness hloov kub ntawm txias-dov precision ci steel kav.
(4) Cov nplej loj cuam tshuam rau qhov toughness brittleness hloov pauv kub, thiab raws li cov nplej coarsens, lub toughness brittleness hloov kub nce.Refining lub grain loj txo qhov nyiam ntawm txias brittleness nyob rau hauv txias dov precision ci steel kav, uas yog ib tug dav siv txoj kev.
Post lub sij hawm: Sep-01-2023