Vuam thiab txiav cov kauv steel yeeb nkab qauv nyob rau hauv daim ntawv thov ntawm kauv steel kav yog inevitable. Vim hais tias ntawm cov yam ntxwv ntawm cov kauv steel yeeb nkab nws tus kheej, nws muaj nws qhov tshwj xeeb tshaj qhov vuam thiab txiav ntawm cov kauv steel yeeb nkab piv nrog cov pa roj carbon ntau, thiab nws muaj peev xwm tsim ntau yam tsis xws luag hauv nws qhov vuam sib koom ua ke thiab thermal zog cheeb tsam ( HAZ). Nyob rau hauv cov nram qab no, high-temperature tawg yog hu ua high-temperature cracks ntawm no yog hais txog cov kab nrib pleb ntsig txog vuam. High-temperature cracks yuav roughly muab faib ua coagulation kab nrib pleb, micro-cracks, kab nrib pleb thiab re-heating tawg nyob rau hauv lub HAZ (thermal influence cheeb tsam).
Qee zaum qhov kub thiab txias tawg qee zaum tshwm sim nyob rau hauv qhov kub tsis tshua muaj qhov tawg ntawm cov kav hlau kauv. Lub ntsiab yog vim li cas rau nws yog qhov kev txwv ntawm hydrogen diffusion, vuam cov pob qij txha thiab cov ntaub so ntswg hardening nyob rau hauv nws, yog li cov kev daws yog tsuas yog los txo hydrogen diffusion thaum vuam, zoo preheat thiab tom qab vuam kub kho, thiab txo cov kev txwv.
Lub toughness ntawm lub welded sib koom yog rhiab heev rau kub kub tawg nyob rau hauv lub kauv steel yeeb nkab. Hais txog kev tsim qauv, nws feem ntau muaj 5% -10% ntawm ferrite. Txawm li cas los xij, lub xub ntiag ntawm cov ferrite no tau ua rau poob qis hauv qhov kub thiab txias.
Thaum lub kauv steel yeeb nkab yog welded, Austrian ntim nyob rau hauv lub vuam sib koom ua ke cheeb tsam yog txo thiab cuam tshuam lub toughness. Tsis tas li ntawd, tom qab qhov nce ntawm cov hlau, nws cov nqi tawv muaj qhov poob qis. Yog vim li cas vim li cas qhov nyuaj ntawm vuam sib koom ua ke ntawm high-purity hlau lub cev stainless hlau tau raug pov thawj kom txo qis los ntawm cov sib xyaw carbon, nitrogen, thiab oxygen.
Cov ntsiab lus oxide nyob rau hauv qee cov hlau welded pob qij txha tau nce cov oxide hom sib xyaw nrog cov khoom tau txais, thiab lwm yam khoom siv los ua ib txoj hauv kev los txo qhov toughness. Qee cov hlau yog vim huab cua sib xyaw hauv cov roj tiv thaiv, thiab cov ntsiab lus nitrogen uas ua rau cov phaj zoo li CR2N ntawm matrix {100｝ nto, thiab cov substrate tsis tshua muaj zog thiab lub zog txo qis.
σ theem brittleness: Ao Shi stainless hlau, hlau stainless hlau thiab bipolar hlau yog nquag mus rau σ theem crispy. Vim tias cov theem ntawm ob peb feem pua ntawm lub koom haum, qhov toughness poob qis heev. "Cov theem feem ntau yog nag lossis daus nyob rau hauv qhov ntau ntawm 600-900 degree C, tshwj xeeb tshaj yog nyob rau ntawm 75 ° C. Cov lus tshaj tawm rau kev tiv thaiv" yuav tsum raug txo kom tsawg li sai tau hauv Ao's stainless hlau.
475 degree Crispy, thaum 475 degree C ({2}} degree C) khaws cia rau ntev, FE -CR alloy yog decomposed mus rau hauv ib tug tsawg-chromium concentration -solid solid tov nrog ib tug tsawg-chromium concentration. Thaum cov chromium concentration nyob rau hauv cov khoom tov yog ntau tshaj 75%, lub deformation hloov los ntawm slipping deformation mus rau ntxaib deformation, uas tshwm sim ntawm 475 degree C brittleness.
