Cov qoob loo loj heev hauv cov neeg ua haujlwm kub kub ua rau muaj kev cuam tshuam rau kev ua haujlwm, ua rau cov khoom siv tsis muaj zog, txo cov tawv nqaij, muaj kev pheej hmoo tawg, thiab ua rau lub neej luv.
1. Deterioration ntawm Mechanical Properties
Txo Lub Zog thiab Hardness: Cov nplej loj heev txo qis thaj tsam ntawm cov qoob loo, thiab cov ciam teb yog qhov tseem ceeb cuam tshuam cuam tshuam kev txav mus los. Txo cov teeb meem txo qis lub zog tensile thiab qaug zog ntawm cov khoom.
Deteriorated Plasticity thiab Toughness: Coarse grains nce lub brittleness ntawm cov hlau, txo elongation tom qab tawg, thiab ua rau nws yooj yim rau nkig tawg nyob rau hauv thermal cycling kev nyuaj siab.
Piv txwv li, qhov siab - kub lub zog ntawm H13 pwm hlau tuaj yeem txo qis dua 20% tom qab cov nplej coarsening, ncaj qha cuam tshuam rau kev txhaj tshuaj molding stability.
2. Muaj kev pheej hmoo ntawm kev tawg thiab ua tsis tiav
Stress Concentration ntawm Grain Boundaries: Cov ciam teb ntawm cov nplej ntxhib yog yooj yim dua rau zawv zawg thiab tsiv teb tsaws, tsim microcrack pib, tshwj xeeb tshaj yog nyob rau ntawm junctions ntawm peb nplej, uas yooj yim ua rau tawg propagation.
Accelerated Creep Damage: Nyob rau hauv ntev - lub sij hawm siab - qhov kub thiab txias kev pab cuam, lub nucleation thiab propagation ntawm grain ciam teb voids ceev, ua rau kom tawg sai sai tom qab nkag mus rau theem peb ntawm creep.
Yog hais tias nrog los ntawm grain ciam teb oxidation los yog localized melting, nws tau tsim rau hauv "overheating," ua rau cov khoom irreparable thiab yuav tsum tau scrapping.
3. Kev tswj tsis tau qhov tseeb:
Tsis sib xws Thermal Expansion: Kev loj hlob tsis zoo hauv cheeb tsam ua rau tsis sib xws microstructure, thiab qhov sib txawv ntawm thermal expansion coefficients ua rau pwm deformation.
Kev cuam tshuam rau Kev Txhaj Tshuaj Molding Zoo: Cov kev hloov pauv hauv cov kab lus sib tw ua rau tsis sib xws, nyem, thiab cov khoom tsis txaus, cuam tshuam rau cov khoom sib xws.
4. Pwm Lub neej luv luv:
Fatigue Crack Initiation Point: Overheated cheeb tsam dhau los ua qhov chaw pib tawg, ua kom nrawm pwm tawg.
Cov Nqi Them Nyiaj Ntau Ntxiv: Kev ncua sij hawm tsis tu ncua rau kev tshuaj xyuas thiab cov khoom hloov pauv txo qis kev tsim khoom thiab ua kom cov nqi tu.
Tswv yim pom zoo: Kev tswj cov cua kub kom qis dua qhov siab tshaj ntawm pwm steel tempering (xws li, H13 steel Tsawg dua lossis sib npaug li 600 degree) tuaj yeem cuam tshuam cov qoob loo loj hlob.
