1. Hnav tsis kam
Thaum cov khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob Yog li ntawd, kev hnav tsis kam ntawm cov khoom siv yog ib qho tseem ceeb tshaj plaws thiab tseem ceeb ntawm cov pwm.
Hardness yog lub ntsiab tseem ceeb cuam tshuam rau hnav tsis kam. Feem ntau, qhov siab dua qhov hardness ntawm pwm qhov chaw, qhov tsawg dua qhov hnav thiab qhov zoo dua qhov hnav tsis kam. Tsis tas li ntawd, hnav tsis kam kuj tseem muaj feem xyuam rau hom, ntau, cov duab, qhov loj thiab kev faib tawm ntawm carbides hauv cov khoom.
2. Muaj zog toughness
Feem ntau ntawm kev ua haujlwm ntawm pwm yog qhov phem heev, thiab qee qhov feem ntau dais qhov cuam tshuam loj, uas ua rau tawg tawg. Txhawm rau tiv thaiv kev tawg sai sai ntawm pwm qhov chaw thaum lub sijhawm ua haujlwm, pwm yuav tsum muaj lub zog siab thiab toughness. Lub toughness ntawm pwm mas nyob ntawm cov ntsiab lus carbon, grain loj thiab lub koom haum lub xeev ntawm cov khoom.
3. Kev qaug zog tawg ua haujlwm
Thaum lub sij hawm ua hauj lwm ntawm cov pwm, qaug zog tawg yog feem ntau tshwm sim nyob rau hauv lub sij hawm ntev kev txiav txim ntawm cyclic kev nyuaj siab. Nws cov ntaub ntawv muaj xws li me-zog ntau yam cuam tshuam qaug zog tawg, tensile qaug zog tawg, hu rau qaug zog tawg thiab khoov qaug zog tawg. Kev qaug zog tawg ntawm cov pwm feem ntau yog nyob ntawm nws lub zog, toughness, hardness, thiab cov ntsiab lus ntawm kev suav nrog hauv cov khoom.
4. Kev ua haujlwm siab kub
Thaum cov pwm ua haujlwm kub siab, qhov hardness thiab lub zog yuav txo qis, ua rau cov pwm pwm thaum ntxov los yog yas deformation thiab tsis ua haujlwm. Yog li ntawd, cov khoom siv pwm yuav tsum muaj kev ruaj ntseg los tiv thaiv kev kub ntxhov kom ntseeg tau tias cov pwm muaj siab hardness thiab lub zog ntawm kev ua haujlwm kub.
5. Thaum tshav kub kub thiab txias qaug zog tsis kam
Qee cov pwm yog nyob rau hauv ib lub xeev ntawm rov ua cua sov thiab txias thaum lub sij hawm ua hauj lwm, uas ua rau lub nto ntawm cov kab noj hniav yuav raug nro, siab thiab kev ntxhov siab, ua rau nto tawg thiab tev, ua rau muaj kev sib txhuam, cuam tshuam cov yas deformation, thiab txo qhov raug , ua rau Pwm tsis ua haujlwm. Kub thiab txias qaug zog yog ib qho tseem ceeb ntawm kev ua hauj lwm kub tsis ua hauj lwm tuag, thiab cov tuag yuav tsum muaj siab tiv taus txias thiab kub qaug zog.
6. corrosion kuj
Thaum qee cov pwm xws li cov pwm yas ua haujlwm, vim tias muaj cov tshuaj chlorine, fluorine thiab lwm yam khoom hauv cov yas, muaj zog corrosive gases xws li HCI thiab HF yog decomposed tom qab cua sov, uas erodes saum npoo ntawm pwm kab noj hniav, tsub kom nws nto. roughness, thiab aggravates hnav tsis ua hauj lwm.
