Cov txheej txheem kev soj ntsuam ntawm kev tawg inducement yog qhov tsim nyog rau kev paub txog qhov tseem ceeb ntawm kev tawg, uas yog lub hauv paus rau kev txheeb xyuas qhov tawg. Nws tuaj yeem raug pom los ntawm ntau qhov kev tshawb nrhiav kev sib tsoo tawg thiab rov ua dua qhov kev sim uas cov txheej txheem thiab cov yam ntxwv ntawm cov hlau forgings tsis sib luag, uas muaj qhov cuam tshuam tseem ceeb rau kev tawg.

1. Cov khoom siv raw nrog symmetrical mechanism thiab cov yam ntxwv.

Nyob rau hauv tag nrho cov txheej txheem ntawm deformation, dislocation kev tawm dag zog raws li lub dav hlau zawv zawg, thiab thaum nws ua tau raws li txoj kev thaiv, nws yuav pawg thiab ua rau muaj kev ntxhov siab hauv av kom ua rau tawg, los yog cavitation thiab micro-cracks vim kev cuam tshuam ntawm dislocation, uas ua ke nrog txoj kev loj hlob ntawm macro-economic cracks. Qhov tseem ceeb no ua rau qhov kub ntawm qhov deformation qis (qis dua qhov ua haujlwm hardening kub), los yog qhov deformation theem loj heev, tus nqi deformation yog ceev heev. Cov kab nrib pleb no feem ntau yog transgranular lossis transgranular thiab intergranular sib xyaw, tab sis vim tias qhov kub thiab txias molecules muaj tus nqi siab dua ntawm sab nrauv diffusion, ua rau kev tawg nce toj, ua kom lub forging kho thiab ua hauj lwm hardening, yog li cov txheej txheem deformation twb ua rau lub micro tawg yog ib qho yooj yim kho, nyob rau hauv deformation kub haum, deformation tus nqi yuav tsis qeeb tus mob.

2. Cov khoom siv raw nrog cov txheej txheem tsis sib xws thiab cov yam ntxwv.

Rau cov ntaub ntawv nrog asymmetrical mechanisms thiab cov khoom, cov kab nrib pleb feem ntau tshwm sim ntawm cov ciam teb thiab qee cov nplooj ntawv theem. Qhov no yog vim lub forging deformation feem ntau nqa tawm nyob ib ncig ntawm qhov sib npaug ntawm lub zog kub ntawm cov ntaub ntawv hlau. Lub deformation ntawm grain ciam teb yog loj heev, yog li cov grain ciam teb ntawm cov ntaub ntawv hlau yog qhov tsis zoo ntawm metallurgical kev lag luam, theem nrab thiab cov ntaub ntawv uas tsis yog xim hlau yog concentrated nyob rau hauv cheeb tsam. Ntawm qhov kub thiab txias, cov tshuaj tsis tshua muaj solubility ntawm cov qoob loo ciam teb ntawm qee cov ntaub ntawv nyoos tsim melting, nruj

Txo cov yas deformation ntawm raw khoom; Thaum qhov kub thiab txias, qee cov ntsiab lus (sulfur, tooj liab, thiab lwm yam) nyob rau hauv cov ntaub ntawv nyob ib puag ncig yog diffused raws li cov ciam teb rau sab hauv thiab sab nraud ntawm cov khoom hlau, uas ua rau qhov txawv txav ntawm theem nrab thiab qhov tsis muaj zog ntawm cov ciam teb. Rau lwm qhov, cov khoom siv hlau tsis zoo muaj kev sib raug zoo nrog qee theem vim qhov sib txawv ntawm lub cev thiab tshuaj lom neeg ntawm ob theem.

Cov ntaub ntawv raw uas nquag siv hauv forging yog feem ntau tsis sib luag. Yog li ntawd, qhov tawg ntawm dawb forgings tshwm sim thiab tsim raws li grain ciam teb los yog theem ciam thaum lub sij hawm kub forging deformation.