Dawb forgingsteel muaj peb yam tseem ceeb hauv qab no nyob rau hauv quenching mob.
(1) Cov yam ntxwv ntawm cov qauv
Raws li steel loj, cua sov kub, lub sij hawm, transformation yam ntxwv thiab txias hom, quenched steel qauv yuav tsum muaj xws li martensite los yog martensite + residual austenite, ntxiv rau, tej zaum yuav muaj me ntsis undissolved carbide. Ob qho tib si martensite thiab residual austenite nyob rau hauv lub xeev metastable ntawm chav tsev kub, thiab lawv zoo li hloov mus rau lub xeev ruaj khov ntawm ferric pawg ntxiv rau cementite.
(2) Hardness yam ntxwv
Lub lattice distortion tshwm sim los ntawm carbon atoms yog qhia los ntawm hardness, uas nce nrog supersaturation, los yog cov ntsiab lus carbon. Quenching qauv hardness, siab zog, plasticity, tsawg toughness.
(3) Cov yam ntxwv ntawm kev ntxhov siab
Nrog rau kev ntxhov siab micro thiab macro kev ntxhov siab, yav dhau los cuam tshuam nrog lattice distortion tshwm sim los ntawm cov pa roj carbon atoms, tshwj xeeb tshaj yog nrog cov pa roj carbon siab martensite kom ncav cuag tus nqi loj heev, kev tsom xam ntawm quenching martensite hauv lub xeev kev ntxhov siab; Qhov tom kawg yog vim qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv thaum quenching, lub workpiece nto los yog qhov chaw ntawm lub xeev kev nyuaj siab yog txawv, muaj tensile kev nyuaj siab los yog compressive kev nyuaj siab, nyob rau hauv lub workpiece kom muaj nuj nqis. Yog tias qhov kev ntxhov siab sab hauv ntawm cov hlau tsis muaj zog tsis raug tshem tawm hauv lub sijhawm, nws yuav ua rau muaj kev deformation ntxiv thiab txawm tias tawg ntawm qhov chaw.
Yuav kom suav tau, txawm hais tias lub quenched workpiece muaj siab hardness thiab siab zog, tab sis lub hauv caug yog loj, cov qauv tsis ruaj khov, thiab muaj ib tug loj quenched nyob rau hauv kev ntxhov siab, yog li nws yuav tsum tau tempered mus thov. Feem ntau hais lus, tempering txheej txheem yog cov txheej txheem tom qab ntawm steel quenching, nws kuj yog cov txheej txheem kawg ntawm cov txheej txheem thermal pov tseg, nws muab lub workpiece heev tom qab qhov kev thov ntawm kev ua haujlwm.
Tempering yog cov txheej txheem ntawm cov cua sov hardened steel rau ib qho kub hauv qab Ac1, khaws cia rau ib lub sijhawm, thiab tom qab ntawd txias rau hauv chav tsev kub. Nws lub hom phiaj tseem ceeb yog:
(1) tsim nyog kho lub hardness thiab lub zog ntawm cov hlau, txhim kho lub toughness ntawm steel, thiaj li hais tias lub workpiece ua tau raws li qhov yuav tsum tau ntawm daim ntawv thov;
(2) ruaj khov qauv, yog li ntawd lub workpiece nyob rau hauv lub chav kawm ntawm daim ntawv thov mus tas li tsis tshwm sim raws li kev hloov pauv, thiaj li stabilize cov style thiab loj ntawm lub workpiece;
Lub quenching nrog kev ntxhov siab ntawm lub workpiece tuaj yeem txo los yog tshem tawm kom txo nws cov deformation thiab tiv thaiv kev tawg.