Cov hlau uas muaj cov ntsiab lus carbon siab tau tawg ntau zaus, xws li cov ncej ua los ntawm 45 # steel, uas yuav tawg tom qab siv sijhawm luv. Kev coj mus kuaj los ntawm cov khoom tawg thiab ua cov kev soj ntsuam metallographic, feem ntau tsis tuaj yeem nrhiav qhov laj thawj, txawm tias nws nyob deb mus nrhiav qee qhov laj thawj, nws tsis yog qhov laj thawj tiag.
Txhawm rau kom ntseeg tau tias muaj zog dua ntawm qee cov khoom siv hlau tsis muaj steel, cov pa roj carbon yuav tsum tau ntxiv rau cov hlau tsis muaj steel, thiab cov hlau carbides yuav raug precipitated. Los ntawm ib qho kev xav ntawm electrochemical, hlau carbide ua raws li cathode kom ceev cov anodic dissolution cov tshuaj tiv thaiv nyob ib ncig ntawm lub substrate. Qhov nce ntawm qhov ntim feem ntawm cov hlau carbides nyob rau hauv lub microstructure kuj yog vim qhov tsawg hydrogen overvoltage zog ntawm cov carbides.
Radon yog yooj yim generated thiab adsorbed rau saum npoo ntawm cov hlau. Thaum cov pa oxygen atoms nkag mus rau hauv cov hlau, qhov ntim feem ntawm radon tuaj yeem nce ntxiv, uas ua rau txo qhov tsis kam mus rau oxygen embrittlement ntawm cov khoom.
Qhov siab dua cov ntsiab lus carbon, qhov qis dua cov pa diffusion coefficient thiab siab dua cov pa solubility. Scholar Chan ib zaug tau hais tias muaj peev xwm ntawm precipitates (raws li qhov chaw ntxiab rau hydrogen atoms), thiab ntau yam lattice defects xws li pores yog proportional rau cov ntsiab lus carbon, thiab qhov nce ntawm cov ntsiab lus carbon yuav inhibit qhov diffusion ntawm oxygen vim hais tias cov pa oxygen diffusion coefficient. kuj qis dua.
Txij li thaum cov ntsiab lus carbon yog proportional rau hydrogen solubility, qhov loj dua qhov ntim feem ntawm carbides li hydrogen atom ntxiab, qhov me dua hydrogen diffusion coefficient hauv cov hlau, qhov ntau dua hydrogen solubility, thiab hydrogen solubility kuj muaj cov ntaub ntawv hais txog diffusible hydrogen, Yog li Hydrogen embrittlement susceptibility, nrog kev nce ntawm cov ntsiab lus carbon, qhov diffusion coefficient ntawm hydrogen atoms txo qis thiab cov pa oxygen concentration nce, uas yog tshwm sim los ntawm qhov txo qis ntawm oxygen overvoltage ntawm steel nto.