Nyob rau hauv tus txheej txheem ntawm quenching, thaum lub loj loj kev nyuaj siab generated los ntawm quenching yog ntau tshaj lub zog ntawm cov khoom nws tus kheej thiab tshaj cov yas deformation txwv, nws yuav ua rau tawg. Lub quenching tawg yog feem ntau ua sai sai tom qab kev hloov pauv ntawm lub cev nees pib, thiab kev faib tawm ntawm qhov tawg tsis muaj ib txoj cai, tab sis nws yog feem ntau yooj yim rau kev tsim ntawm lub kaum ntse ntse thiab hla ntu kev hloov ntawm lub workpiece. Lub quenching cracking pom nyob rau hauv lub tshuab raj yuav yog intergranular cracking los yog transgranular cracking. Ib txhia yog radial, thiab ib txhia yog ib kab los yog tes hauj lwm. Lub quenching tawg tshwm sim los ntawm txias txias nyob rau hauv lub martensitic hloov chaw yog feem ntau transgranular faib, thiab cov tawg yog qhov tseeb, thiab tsis muaj ceg nyob ib ncig ntawm lub me me tawg. Cov kab nrib pleb uas tshwm sim los ntawm qhov kub thiab txias txias yog faib raws cov siv lead ua, qhov tawg kawg yog qhov zoo, thiab cov yam ntxwv ntawm overheating yog: coarse acicular martensite tuaj yeem pom hauv cov qauv hlau; Eutectic lossis angular carbides tuaj yeem pom hauv cov cuab yeej hlau. Lub siab carbon steel workpiece nrog decarburized nto yog ib qho yooj yim los tsim mesh tawg tom qab quenching. Qhov no yog vim hais tias lub ntim nthuav dav ntawm decarburized txheej thaum lub sij hawm quenching txias yog me dua li ntawm cov tub ntxhais undecarburized, thiab cov khoom nto yog rub tawm los ntawm kev nthuav dav ntawm cov tub ntxhais hauv lub network.
Cov ntaub ntawv yooj yim ntawm quenching cov kab nrib pleb yog: longitudinal Raven, transverse kab nrib pleb, mesh kab nrib pleb thiab tev kab nrib pleb, thiab lwm yam, cov xwm txheej tshwj xeeb yog raws li hauv qab no: 1, longitudinal tawg yog feem ntau generated ntawm hardened steel, thiab tangential tensile kev nyuaj siab ntawm lub nto saum npoo yog ntau tshaj qhov axial tensile stress tuaj yeem tshwm sim. Cov kab nrib pleb yog faib axially los ntawm qhov chaw mus rau qhov chaw. 2, transverse tawg nws yog nyob rau hauv cov ntaub ntawv ntawm lub workpiece yog tsis quenched, generated nyob rau hauv lub hloov chaw ntawm lub quenched txheej thiab lub unquenched core. Cov kev ntxhov siab sab hauv yog tus cwj pwm los ntawm qhov chaw compression, compressive kev nyuaj siab dhau los ua tensile kev nyuaj siab ntawm qhov deb ntawm qhov chaw, thiab axial tensile stress yog qhov loj tshaj plaws, ua rau cov kab nrib pleb. 3, kev nyuaj siab concentration tawg qhov chaw nrog cov ces kaum, notches, grooves yog ib qho yooj yim los tsim kev nyuaj siab concentration. Ua ke nrog qhov tsis sib xws quenching txias, nws yog feem ntau yooj yim ua rau tawg ntawm cov khoom no. Qhov tawg no tsis muaj cov yam ntxwv morphological ruaj khov. 4, mesh tawg Nws yog qhov tawg, nws qhov tob yog qhov ntiav, feem ntau nyob rau hauv thaj tsam ntawm 0.01-2mm, tawg huab tais nyob rau hauv txhua txoj kev, tsim ib lub network. Tom qab decarburization nto ntawm high carbon steel workpiece, nws martensitic tshwj xeeb ntim yog me me, uas ua rau tensile kev nyuaj siab ntawm nto thiab ua rau mesh tawg. 5, lub tev tawg yog tsim nyob rau hauv ib tug heev nyias cheeb tsam nrog ib tug ntse hloov ntawm kev nyuaj siab, thiab nto yog spalling thaum lub sab hauv kem mus rau lub nto yog tiag tiag ncua.
