1. Cov khoom siv muaj pes tsawg leeg thiab ntsuas phoo
Carbon sib npaug (CE): ntau dhau carbon lossis alloying ntsiab (xws li cr, mo) tuaj yeem yooj yim ua rau brittleness yooj yim. Cov ntsiab lus ntawm C, Si, MN, thiab lwm yam, yuav tsum tau kuaj pom uas siv lub tshuab hluav taws xob.
Metallographic cov qauv: Saib seb cov nplej puas yog ntxhib lossis yog tias theem txawv txawv (xws li martensite, bainite) tam sim no. Cov ntaub ntawv cov ntaub ntawv ntau zaus feem ntau qhia cleavage fracture cov yam ntxwv.
2. Tsawg - kub kev ntsuas kub
Kev Ntsuas Qhov Kev Ntsuas: Ntsuas cov Charpy cuam tshuam Lub Zog (AKV) hauv qab -20 degree. Yog tias nws qis dua 27 xyoos (20 FiltAf), muaj kev pheej hmoo ntawm brittleness.
NDT kub: txiav txim rau nil - Duction Kev hloov Kub los ntawm kev tsim qhov hnyav los xyuas kom ntseeg tau tias qhov kev tsim nyog kub siab dua NDT tus nqi.
3. Cov neeg kho tshuab ua haujlwm
Tensile Kuaj: Lub elongation tom qab tsoo ntawm cov ntaub ntawv loj me yog feem ntau<5%, and the fracture surface is crystalline.
Kev Kuaj Hardness: Brinell Hardness (HB)> 200 tej zaum yuav qhia qhov nyiam ntawm brittleness.
4. Ib puag ncig thiab cov txheej txheem cuam tshuam
Hydrogen embrittlement / kev nyuaj siab corrosion) hauv cov acidic ib puag ncig lossis tom qab cov ntsiab lus hydrogen yuav tsum tau kuaj kom tsis txhob ncua qeeb.
Ua {-} induced embrittlement: kev kho mob kub heev (xws li tempering thaum muaj kev kub ntxhov.
5. Tsis -} Kev sim tshuaj ntsuam
Kev Kuaj Ntawv Ultrasonic: Kev tawg sab hauv lossis delamination yuav qhia raws li cov cim hluav taws xob siab thiab yuav tsum ua raws li GB / T5777 tus qauv.
