Kev sib raug zoo ntawm Microstructural hloov thaum lub sij hawm laus txheej txheem thiab hardness

 

Thaum lub sij hawm nruab nrab - qhov kub thiab txias txheej txheem ntawm 150 - 250 degree, ib tug series ntawm microstructural hloov nyob rau hauv NK / KE steel. Raws li qhov kub thiab txias nce mus txog lub sijhawm dhau mus, cov ntsiab lus alloy yuav precipitate ntawm ib tus nqi los ua precipitates. Kev tsim thiab kev loj hlob ntawm cov precipitates no yuav cuam tshuam qhov kev txav ntawm dislocations. Qhov nce ntawm cov degree ntawm dislocation txav obstruction yog ze ze rau qhov nce hardness. Piv txwv li, thaum dislocations nyuaj rau tsiv mus nyob rau hauv lub lattice, cov khoom tiv thaiv deformation yog txhim khu kev qha, thiab yog li cov hardness nce.

 

Nyob rau tib lub sijhawm, qhov nruab nrab - qhov kub thiab txias kuj tuaj yeem ua rau muaj kev hloov pauv ntawm cov qoob loo ciam teb. Lub atomic kev npaj thiab lub zog lub xeev nyob rau hauv lub grain ciam teb yuav hloov, cuam tshuam rau kev txav ntawm grain ciam teb thiab lub emission thiab nqus ntawm dislocations ntawm lub grain ciam teb. Qhov no kuj muaj kev cuam tshuam rau cov khoom hardness vim hais tias lub zog ntawm cov ciam teb ntawm grain kuj yog ib qho tseem ceeb rau kev txiav txim siab hardness ntawm cov khoom.

 

Qhov cuam tshuam ntawm Nruab Nrab - Kub Kub Lub Sij Hawm Rau Hardness

 

Pib Hardness - nce theem: Thaum thawj theem ntawm nruab nrab - kub aging, raws li lub sij hawm aging nce, hardness maj mam nce. Piv txwv li, nyob rau hauv thawj 5 - 10 teev ntawm kev laus ntawm 180 degree, raws li cov precipitates pib tsim thiab maj mam nce nyob rau hauv tus naj npawb, qhov kev tiv thaiv rau dislocation txav tsis tu ncua nce, thiab hardness ntawm NK / KE steel tej zaum yuav muaj ib tug kuj. pom tseeb nce. Tus nqi ntawm qhov kev nce no muaj feem xyuam rau cov hom thiab cov ntsiab lus ntawm cov hlau alloy. Yog hais tias cov hlau muaj ntau cov ntsiab lus alloy uas yooj yim rau kev tsim precipitates, xws li niobium thiab vanadium, qhov ceev ntawm hardness nce yuav sai dua.

 

Nruab nrab Stable Stage: Thaum lub sij hawm kev laus nce mus txog ib theem, feem ntau nyob ib ncig ntawm 10 - 20 teev (lub sij hawm tshwj xeeb txawv nyob ntawm seb yam xws li kub thiab muaj pes tsawg leeg ntawm cov hlau), tus nqi ntawm hardness nce yuav maj mam qeeb. Lub sijhawm no, kev loj hlob ntawm precipitates thiab kev sib cuam tshuam ntawm dislocations ncav cuag lub xeev sib npaug. Nyob rau hauv cov theem no, lub hardness yeej tseem nyob ruaj khov los yog muaj kev hloov me ntsis. Piv txwv li, nyob ib ncig ntawm 15 teev ntawm kev laus ntawm 200 degree, lub hardness ntawm NK / KE steel yuav nyob twj ywm ruaj khov nyob rau theem siab, vim hais tias tus naj npawb thiab qhov loj ntawm precipitates tau dhau los ua qhov ruaj khov, thiab kev tiv thaiv kev txav mus los tsis muaj ntxiv lawm. pom kev hloov pauv.

 

Tau Tom Qab - theem Txo: Yog hais tias lub sij hawm aging ntev dhau lawm, yuav txo tau hardness. Qhov no yog vim dhau - kev laus yuav ua rau coarsening thiab agglomeration ntawm precipitates, enabling dislocations bypass lub precipitates yooj yim dua, yog li txo qhov tsis kam mus rau dislocation txav. Piv txwv li, tom qab kev laus ntawm 230 degree rau ntau tshaj 30 teev, lub hardness ntawm NK / KE steel yuav pib txo vim yog coarsening ntawm precipitates. Txawm li cas los xij, qhov xwm txheej no yuav tsum tau txiav txim siab raws li cov hom steel tshwj xeeb thiab kev laus. Qhov txo qis hauv hardness ntawm qee cov hlau tom qab ntev - lub sij hawm laus tej zaum kuj me me.

 

 

 

 

 

NK/KE General Strength Chemical Composition
Qib	Cov ntsiab lus Max (%)
	C	Si	Mn	P	S	AL
NK/KOJ	0.18	0.35	0.70	0.035	0.035	0.015

 

 

Qhov cuam tshuam ntawm Nruab Nrab - Kub Kub Kub Kub rau Hardness

 

 

 

Nruab nrab - qhov kub thiab txias (200 - 230 degree): Qhov no yog qhov zoo tshaj plaws kub ntau rau nruab nrab - kub aging. Noj 220 degree ua piv txwv, ntawm qhov ntsuas kub no, qhov nrawm nrawm ntawm atomic diffusion yog nruab nrab, thiab cov nag lossis daus tuaj yeem loj hlob mus rau qhov tsim nyog loj nyob rau lub sijhawm tsim nyog, ua rau muaj kev cuam tshuam zoo ntawm kev txav mus los. Kev laus nyob rau hauv qhov kub thiab txias no tuaj yeem ua rau kom muaj zog ntxiv. Piv txwv li, piv nrog NK / KE steel yam tsis muaj kev laus kev kho mob, tom qab kev laus ntawm 220 degree rau 15 - 20 teev, lub hardness yuav nce li ntawm 30% - 50%, ua kom cov khoom zoo dua tiv thaiv nto indentation thiab hnav deformation.

 

Siab dua - qhov kub thiab txias (230 - 250 degree): Raws li qhov kub nce mus txog 250 degree, atomic diffusion ceev nrawm, thiab kev loj hlob ceev ntawm precipitates kuj ua sai dua. Txawm hais tias lub hardness yuav nce sai heev nyob rau hauv thaum ntxov theem ntawm kev laus, vim hais tias cov precipitates yog nquag mus rau kev loj hlob ntau dhau lawm, kev tiv thaiv rau dislocation txav yuav txo tau nyob rau hauv lub tom ntej theem, ua rau lub hardness yuav txo los yog loj hlob qeeb. Thaum laus ntawm 240 degree, lub hardness yuav ncav cuag tus nqi siab nyob rau hauv ib tug luv luv lub sij hawm (piv txwv li, 10 - 15 teev), tab sis yog hais tias cov laus mus ntxiv, lub hardness yuav tsis nce los yog txawm txo vim lub coarsening. ntawm precipitates.

 

 

 

 

 

Vim li cas thiaj xaiv peb?
Peb txaus siab rau peb lub peev xwm los muab cov kev cai daws teeb meem rau peb cov neeg siv khoom cov kev xav tau tshwj xeeb.
Peb txheeb xyuas thiab sib piv cov khoom dhau los thiab cov xwm txheej tam sim no ntawm peb KE Steel Phaj, thiab tsim cov txheej txheem tshiab thiab cov txheej txheem.
Peb cov neeg siv khoom ntseeg peb kom xa cov khoom zoo Cold-rolled Steel khoom raws sij hawm thiab ntawm pob nyiaj siv.
Peb nruj me ntsis siv cov kev pab cuam sov so thiab kev xav tom qab muag, ua raws li kev txhim kho kev ua haujlwm zoo.
Peb muab ntau hom Cold-rolled Steel khoom kom tau raws li cov neeg siv khoom xav tau.
Peb ua raws li cov neeg siv khoom-centric thiab hom-taw qhia kev lag luam lub tswv yim, thiab txuas ntxiv muab cov neeg siv khoom txhim khu kev qha thiab cov khoom zoo thiab cov kev pabcuam.
Peb lub Hoobkas tau cog lus los txhawb nqa cov qauv siab tshaj plaws ntawm kev nyab xeeb thiab zoo.
Txhua tus neeg ua haujlwm ntawm peb lub tuam txhab thiab txhua lub tuam haujlwm ua haujlwm ua ke los ua ke kev tswj hwm kev lag luam, kev tshaj lij thev naus laus zis, kev txheeb cais ntau thiab kev kawm ideological.
Peb cov khoom siv Cold-rolled Steel paub txog lawv cov kav ntev thiab kev ntseeg tau.
Kev vam khom rau qhov zoo tshaj plaws thiab muaj txiaj ntsig zoo ntawm cov khoom loj, peb muaj peev xwm ua tau raws li qhov sib txawv ntawm peb cov neeg siv khoom.

Cim npe nrov: ke steel phaj, Tuam Tshoj ke steel phaj lwm tus neeg, hoobkas