Kev ua haujlwm ntawm steel hlau
Thermal qaug zog kuj
Ntxiv nrog rau qhov hloov pauv ntawm lub sijhawm, cov hlau ua haujlwm kub kub kuj tseem cuam tshuam los ntawm qhov kub thiab txias thiab lub sij hawm ceev-txias thiab cua kub ceev. Yog li ntawd, qhov kev ntsuam xyuas ntawm cov pob txha tsis kam ntawm kub ua hauj lwm tuag steel yuav tsum tau them sai sai rau lub thermal mechanical qaug zog tawg ntawm cov khoom. Thermomechanical qaug zog yog ib qho kev ntsuas kev ua tau zoo, uas suav nrog peb yam: thermal qaug zog kev ua haujlwm, cov neeg kho tshuab qaug zog tawg qhov kev loj hlob thiab tawg toughness.
Lub thermal qaug zog kev ua tau zoo qhia txog lub neej ua haujlwm ntawm cov khoom ua ntej pib ntawm thermal qaug zog tawg. Tus naj npawb ntawm thermal cycles ntawm cov khoom nrog siab thermal qaug zog kuj yog ntau dua. Cov neeg kho tshuab qaug zog tawg qhov kev nthuav tawm qhia txog qhov kev nthuav tawm ntawm txhua lub voj voog kev ntxhov siab thaum qhov tawg tawm sab hauv raws li kev ua ntawm forging siab tom qab thermal qaug zog tawg pib. Fracture toughness qhia txog qhov tsis kam ntawm cov khoom siv rau kev nthuav tawm tsis ruaj khov ntawm cov kab nrib pleb uas twb muaj lawm. Rau cov khoom uas muaj kev puas siab puas ntsws toughness, qhov tawg yuav tsum muaj qhov muaj kev ntxhov siab txaus txaus ntawm qhov tawg, uas yog, qhov tawg loj ntev, yog tias nws yuav tsum muaj kev nthuav tawm tsis ruaj khov. Raws li kev ntxhov siab tas li, twb muaj qhov qaug zog tawg hauv qhov tuag. Yog hais tias lub pob txha toughness tus nqi ntawm cov khoom siv tuag yog siab, lub tawg yuav tsum propagate ntxaum ua ntej instability yuav tshwm sim.
Hauv lwm lo lus, thermal qaug zog tsis kam txiav txim siab ib feem ntawm lub neej ua ntej qaug zog tawg pib; Qhov kev loj hlob tawg thiab tawg toughness tuaj yeem txiav txim siab txog ib feem ntawm lub neej thaum kev loj hlob subcritical tshwm sim tom qab tawg pib. Yog li ntawd, txhawm rau kom tau txais lub neej siab ntawm kev ua haujlwm kub tuag, cov khoom siv tuag yuav tsum muaj cov thermal fatigue tsis kam, tsis tshua muaj kev loj hlob tus nqi thiab siab tawg toughness tus nqi.
Qhov Performance index ntawm thermal qaug zog tuaj yeem ntsuas tau los ntawm tus naj npawb ntawm thermal qaug zog tawg pib, tus naj npawb ntawm qaug zog tawg tom qab qee lub voj voog thermal thiab qhov nruab nrab qhov tob lossis ntev.
Hnav tsis kam
Qhov tseem ceeb tshaj plaws uas txiav txim siab txog kev pab cuam lub neej ntawm cov tuag feem ntau yog qhov hnav tsis kam ntawm cov khoom siv tuag. Cov tuag tau raug kev nyuaj siab ntau heev thiab kev sib txhuam quab yuam hauv kev ua haujlwm, yog li nws yuav tsum tau ua kom cov tuag tuaj yeem tswj hwm nws qhov tseeb qhov tseeb hauv kev sib txhuam. Pwm hnav feem ntau suav nrog txhua yam hnav, hnav oxidation thiab yaj hnav. Txhawm rau txhim kho qhov hnav tsis kam ntawm cov hlau tuag, nws yog ib qho tsim nyog tsis yog tsuas yog ua kom lub siab hardness ntawm cov hlau tuag, tab sis kuj yuav tsum xyuas kom meej tias muaj pes tsawg leeg, morphology thiab kev faib tawm ntawm carbide los yog lwm yam hardening theem hauv steel yog tsim nyog. Rau kev tuag hauv kev pabcuam hauv qab cov haujlwm hnyav thiab kev ceev nrawm, nws yuav tsum tau ua kom zoo nkauj, txo cov kev hnav zoo nkauj, txo cov kev hnav zoo nkauj, txo cov kev hnav zoo nkauj los ntawm kev tuag thiab cov haujlwm ua haujlwm, xws li nplaum, vuam thiab lwm yam, thiab txo cov oxidation ntawm cov tuag nto uas ua rau oxidative hnav. Yog li kev ua haujlwm ntawm kev tuag muaj kev cuam tshuam zoo rau kev hnav cov hlau.
Kev hnav tsis kam tuaj yeem ntsuas los ntawm txoj kev simulation simulation, thiab tus txheeb ze hnav tsis kam index (E) tuaj yeem siv los ua tus yam ntxwv rau tus cwj pwm hnav tsis kam nyob rau hauv cov tshuaj sib txawv thiab cov koom haum. Txhawm rau qhia lub neej ua ntej qhov ntsuas qhov siab burr, qhia txog kev hnav tsis kam ntawm ntau hom hlau; Qhov kev sim tau muab piv nrog Cr12MoV steel (Ie =1).
Occlusal tsis kam
Kev tiv thaiv tom qab yog qhov ua tau ntawm "txias vuam". Cov cuab yeej no tseem ceeb dua rau cov khoom siv tuag. Thaum lub sij hawm qhov kev xeem, nyob rau hauv qhuav kev sib txhuam tej yam kev mob, lub cuab tam steel qauv nyob rau hauv kev sim thiab cov khoom nrog occlusal tendency (xws li austenitic steel) yog nqa tawm tas li ceev dual kev sib txhuam suab, thiab lub load maj mam nce nyob rau hauv ib tug tej yam ceev. Lub sij hawm no, lub torque kuj nce correspondingly. Lub load yog hu ua "critical occlusal load", qhov siab dua qhov tseem ceeb load, lub zog occlusal kuj.
