Qhov kev nkag siab zoo tshaj plaws ntawm kev ua kom tawv tawv saum npoo av yog tias nws tuaj yeem txhim kho lub npoo hardness ntawm cov ntaub ntawv thiab txhim kho cov khoom coj tawm tsam. Tab sis nws tseem yog ib txoj hauv kev zoo los txhim kho lub zog qaug zog ntawm cov ntaub ntawv. Koj puas paub vim li cas? Niaj hnub no peb yuav ua tibzoo saib ntawm lub tshuab ua qhov no.
Muaj peb lub ntsiab lus tseem ceeb rau cov nucleation feem ntau ntawm cov qaug zog tawg, raws li qhia hauv daim duab saum toj no. Ib qho yog swb Dislocation rau saum npoo ntawm cov khoom, thiab lwm ob yog tshwm sim los ntawm cov khoom txawv txawv (xws li niaj hnub sib txawv ntawm cov nyhuv ntawm cov nyhuv saum npoo ua rau muaj zog. Piv txwv tias cov khoom tsis muaj qhov tsis xws luag, swb Dislocations yog qhov tseem ceeb ntawm kev txiav txim siab.
Thaum cov ntaub ntawv raug kaw sab nraud, npleem tau tshwm sim ntawm cov nplai me me, thiab cov nplais bands tsim cov excusion thiab intrusion los ntawm swb rau ib leeg. Raws li muaj nyob hauv daim duab hauv qab no, cov nplais bands thiab cov chaw nyob ib sab ntawm kev extrusion thiab kev nkag siab ua raws li kev ntxhov siab cov ntsiab lus, qhov twg tawg. Vim tias cov kev ntxhov siab ntau yog qhov tseem ceeb, cov kab nrib pleb feem ntau tshwm sim thiab nthuav dav ntawm 45℃kaum. Piv nrog cov nplej sab hauv, cov nplej rau saum npoo ntawm cov chaw muaj peev xwm ntau dua los ua cov khoom siv tsis zoo vim tias tsis muaj kev txhawb nqa los ntawm cov nplej ib puag ncig.
Thaum peb saum npoo tawv ntawm qhov chaw, lub hardness ntawm cov khoom saum npoo yog txhim kho heev, thiab lub hardness yog ncaj qha rau lub zog ntawm cov hlau. Qhov nce nyob rau hauv hardness txhais tau tias nws lub peev xwm los tiv thaiv kev deformation yas tau nce. Piv nrog cov ntaub ntawv mos uas tsis tau ua rau tawv tawv, cov khoom tawv tsis tshua muaj kev tawm tsam kev ploj mus. Yog tias koj soj ntsuam lub microphooGraph, koj yuav pom tias muaj qhov tsis pom meej ntxiv lossis kev nkag siab ntawm qhov chaw tawv tawv. Yog li ntawd, tsis muaj kev ntxhov siab tsim los ntawm kev swb ntawm cov hlau saum npoo av, thiab qhov ua tau ntawm kev pib tawg tau zoo heev. Qhov no yog qhov laj thawj tseem ceeb vim li cas cov tawv nqaij ua tau zoo tuaj yeem txhim kho lub zog nkees ntawm cov khoom siv. Yog lawm, kuj tseem muaj lub laj thawj theem nrab. Tom qab quenching thiab hardening, saum npoo ntawm cov khoom siv tau feem ntau ua cov kev ntxhov siab ntawm lub ntsej muag sib txuas. Qhov kev sib cav sib haum xeeb no tseem pab tau tiv thaiv kev pib thiab kev nthuav dav ntawm kev ua kom qaug zog, yog li txhim kho lub neej qaug zog ntawm cov khoom. Txawm li cas los xij, muaj ob lub ntsiab lus kom nco qab txhua tus neeg thaum kawg: Ua ntej, yog tias cov txheej txheem kev tswj hwm tsis tsim nyog lossis cov txheej txheem kev ua txhaum cai thaum lub sijhawm tawv tawv. Thib ob, yog tias qhov tawv tawv yuav tsum tau ua tiav, cov txheej txheem no kuj tseem yuav ua rau nws muaj kev ntxhov siab ntau ntxiv, uas yuav ua rau qee qhov tsis txaus ntseeg, uas yuav ua qee yam tsis zoo rau kev ua kom tsis muaj zog.(文章来源: Imchanics 机械)
