Cov kauj ruam ua haujlwm tshwj xeeb rau re-quenching thiab standardized tempering:

Txhawm rau kom muaj kev txhim kho microstructure thiab kev ua haujlwm rov qab, cov txheej txheem kev ua haujlwm tshwj xeeb rau re-quenching thiab standardized tempering muaj cua sov rau 1020-1050 degree, tuav ntawm qhov kub thiab txias, quenching, thiab tom qab ntawd ua ob txheej txheem tempering ntawm 550-600 degree, txhua tuav tsawg kawg yog ob teev.

 

1. Requenching

Cov txheej txheem

Cov ntsiab lus tseem ceeb

Lub hom phiaj

① Cua sov

Ua kom sov lub workpiece maj mam mus rau 1020-1050 degree. Segmented preheating (piv txwv li, 600 degree, 850 degree)

qhia kom tsis txhob tawg lossis distortion los ntawm kev kub ntxhov.

② Lub Sijhawm Tuav

txiav txim siab siv lub workpiece zoo thickness

Rau txhua 25 hli tuab, tuav tsawg kawg 30 feeb. Xyuas kom tseeb tias cov tub ntxhais tau txais txaus austenitized.

③ Txoj kev ua kom txias

Siv siab - cua txias (lub tshuab nqus tsev vacuum) lossis roj txias (N32 / N46 tshuab roj pom zoo).

ua kom zoo, homogeneous martensitic qauv.

Kev ceev faj: Txhawm rau tiv thaiv deformation, ua kom tsis sib xws ntawm qhov sib sib zog nqus thiab cov roj kub siab dhau thaum txias (<60°C is advised).

 

2. Pa Tempering

Cov txheej txheem

Cov ntsiab lus tseem ceeb

Lub hom phiaj

① Pib Tempering

Tom qab quenching, tuav ntawm qhov kub ntawm 550-600℃(580℃yog qhov zoo tagnrho) tsawg kawg yog ob teev.

tso tawm feem ntau ntawm cov residual nro thiab pib qhov kev hloov ntawm microstructure.

② Txog Chav Kub Kub

Tom qab tempering, nws yuav tsum yog huab cua - txias rau chav tsev kub (<50°C); fast cooling is not allowed.

txwv tsis pub tshiab thermal kev nyuaj siab los ntawm kev txhim kho.

③ Thib ob Tempering

Tuav qhov kub thiab txias tsis tu ncua, rov ua cov txheej txheem tempering thawj zaug.

txhim khu microstructure stability thiab tag nrho tshem tawm kev ntxhov siab rebound.

Lus Cim Tshwj Xeeb: Hardness thiab toughness yuav tsis ruaj khov yog tias tsuas yog ib theem tempering xwb.

 

3. Kev Tshawb Fawb thiab Tshaj Tawm -Kev Ntsuas Kev Kho Mob

Kev Ntsuas Hardness: Ntsuas peb mus rau tsib qhov chaw ntawm txhua daim uas siv lub hardness tester kom paub tseeb tias:

48–52 HRC qhov nruab nrab;

Ntau yam tsawg dua los yog sib npaug rau 2 HRC rau ib thooj.

Metallographic sampling: tsawg kawg 5% ntawm cov qauv yog muab rho tawm los ntawm txhua batch los xyuas kom meej tias lub microstructure yog muaj li ntawm tawg carbides thiab homogenous tempered martensite;

Lub qhov cub kub qhov profile khaws cia: Rau kev tswj xyuas tau zoo, cov ntaub ntawv kub tau khaws cia rau lub sijhawm ua haujlwm.