Kev sib tham txog cov khoom siv hlau hnav-resistant
Tsis muaj universal hnav-resistant khoom nyob rau hauv lub ntiaj teb no. Raws li cov lus hais mus, qhov zoo tshaj plaws yog qhov tsim nyog. Muaj ntau ntau hom khoom hnav-resistant, thiab nws suab zoo li ntau. Raws li ib tug neeg siv, yuav ua li cas xaiv thiab siv cov ntaub ntawv hnav-resistant kuj yog kev tshawb fawb.
Ua ntej tshaj plaws, hardness yog qhov ntsuas tseem ceeb kom paub qhov txawv ntawm lub cev sib tsoo. Tom qab nruj quenching, lub cev sib tsoo muaj kev hnav zoo tsuas yog thaum HRC hardness ncav cuag 58 lossis ntau dua. Txawm li cas los xij, lub hardness ntawm hnav-resistant cov ntaub ntawv tsis yog siab npaum li sai tau. Qee qhov kev ua haujlwm nyob rau hauv cov xwm txheej ntawm cov hardness siab, nws yog ib qho yooj yim los ua qhov pib ntawm microcracks. Txij li cov txheej txheem hnav yog txheej txheem kev sib txuam ntawm ntau qhov sib cuam tshuam, nws tsis yog tsuas yog cuam tshuam nrog cov yam ntxwv ntawm kev sib tsoo lub cev ntawm tus kheej cov khoom, tab sis kuj muaj feem xyuam rau daim ntawv sib txhuam, lub xeev saum npoo, thiab cov kev pabcuam (xws li siab thiab kub, lwm yam).
Thaum xaiv lub cev sib tsoo, nws yuav tsum tau txiav txim siab raws li kev ua haujlwm ntawm lub cev sib tsoo. Piv txwv li, rau abrasive hnav ntawm micro-txiav mechanism, nce hardness ntawm hnav-resistant casting yog haum rau kev txhim kho ntawm hnav tsis kam; Rau qhov qaug zog spalling mechanism Nyob rau hauv cov nqe lus ntawm abrasive hnav, ua ke ntawm siab hardness ntawm hnav-resistant cov ntaub ntawv (castings) thiab zoo plasticity thiab toughness, tshwj xeeb tshaj yog nyob rau hauv ua ke nrog zoo fracture toughness, tsawg tawg loj hlob npaum li cas thiab muaj feem xyuam rau qaug zog kuj, yog zoo. hnav tsis kam. Txhim kho abrasiveness.
Cov ntsiab cai ntawm kev xaiv cov khoom hnav-resistant
Kev qaug zog hnav: Rau kev qaug zog hnav, nws yuav tsum tau txiav txim siab kom muaj kev koom tes zoo dua qub thiab tawg kev loj hlob tsis kam.
Abrasive hnav: Nws yog ib qho tsim nyog los xaiv cov khoom siv nrog cov tawv tawv kom txhim kho hnav tsis kam. Thaum muaj kev cuam tshuam loj, ua ntej xav txog qhov toughness, thiab tom qab ntawd xav txog nws hardness.
Corrosive hnav: Feem ntau, kev ua haujlwm zoo corrosion ntawm cov ntaub ntawv hnav-resistant yuav tsum tau txiav txim siab ua ntej.
