Tsoos spheroidizing annealing txheej txheem thiab nws cov teeb meem uas twb muaj lawm

Tsoos spheroidizing kho qhov txhab tau muab faib ua ob theem hauv qab no.

(1) Hauv kev npaj theem rau spheroidization, cov hlau yuav tsum tau spheroidized thiab annealed yog rhaub kom kub txog 30-50 ° C siab dua qhov tseem ceeb thiab tuav rau 1 txog 2 teev rau austenitization, yog li cov carbides tau yaj mus rau hauv austenite. Nws yog tom qab txias sai rau hauv qab qhov tseem ceeb Ac kom tau txais cov pob zeb zoo thiab ua kom zoo dua cov carbides los pab txhawb kev txhim kho tom qab. Kev ua kom cov nplej thiab ua kom cov carbides tsim tau cov txheej txheem rau kev ua haujlwm du, yog li theem no hu ua spheroidization npaj theem. Feem ntau, kev npaj theem rau spheroidization pib los ntawm cua sov cov hlau mus rau 850 ~ 900 ° C thiab tuav nws rau 1 ~ 2h, uas siv sijhawm li kaum teev hauv tag nrho.

(2) Nyob rau theem spheroidizing, cov hlau tau ua kom sov thiab txias mus rau 700 ~ 750 ° C thiab khaws cia txog li 10 teev, yog li cov carbide ua kom zoo yuav tsim cov carbide kheej kheej los ntawm kev sib koom ua ke thiab sib kis, ua tiav cov txheej txheem spheroidizing thiab txhim kho.

Los ntawm cov txheej txheem spheroidization saum toj no, nws tuaj yeem txiav txim siab tias cov hlau eutectoid thiab hypereutectoid hlau nrog cov ntsiab lus carbon ntau dua, nyob rau hauv qhov kev ua ntawm qhov kub siab ntev, ua ntej ua rau oxidation thiab decarburization ntawm cov hlau nto, uas txo cov nplaim zoo ntawm hlau; Lub sij hawm spheroidization kev txuag hluav taws xob ua kom siv zog ntau dua thiab txo kev ua haujlwm tau zoo. Yog li ntawd, nws tau cia siab tias cov txheej txheem txheej txheej txheej txheej sai tuaj yeem tuaj yeem kawm kom luv lub spheroidizing annealing cycle thiab txhim kho qhov zoo ntawm cov hlau.