Swosc-hv Oil Quenching Thiab Tempering Hlav Hlau Hlau

Tempering brittleness hais txog qhov phenomenon tias toughness ntawm quenched-hlau txo tom qab tempering.

Temper brittleness: lub zog ua kom sov, thaum muaj qhov kub thiab txias dua, qis dua, muaj zog ntau dua, tab sis ntau ntau qhov kub ntxhov thiab qhov teeb meem toughness nyob rau hauv qhov sib txhaub sib txuas ntawm ob lub pob zeb, ntawm 200 ~ 350 ℃, thiab lwm tus yog nruab nrab ntawm 450 ~ 650 ℃ .Cov kub kub li, qhov teeb meem toughness txo. Qhov kub ntub brittleness yuav muab faib ua hom thawj thiab hom thib ob.

Thawj hom kev mob brittleness no kuj yog hu ua lub siab ua tsis tau zoo, tsis tshua muaj siab txias brittleness, tsuas yog nyob hauv qhov kub thiab txias yog 250 ~ 400 ℃,

Yam ntxwv ntawm cov

(1) nws tsis ua haujlwm txuam nrog; (2) tsis muaj dab tsi ua rau txias txias tom qab tempering; (3) qhov puas yog kev sib tshuam ntawm intergranular brittle.

1. Peb lub tswv yim ntawm qhov ua rau:

(1) kev hloov ntawm txoj kev hloov mus ntxiv; (2) kev tshawb fawb los ntawm kev ua tsov rog; (3) impurity kev sib cais ntawm txoj kev xav

2. Cov hau kev tiv thaiv

Nws yuav tsis raug tshem tawm. Yog tsis muaj kev sib sau ua ke uas yuav pab tau kom tsis txhob cuam tshuam cov tiam ntawm kev ua siab phem yog tias nws tsis yog nyob hauv qhov kub siab li no

(1) txo cov ntsiab lus ntawm kev tsis huv hauv cov hlau;

(2) deoxidize Al los yog ntxiv cov ntsiab lus xws li Nb, V thiab Ti los ua kom zoo dua grain A;

(3) qhov sib ntxiv ntawm Mo thiab W yuav ua rau muaj kev ntxhov siab;

(4) ntxiv Cr thiab Si mus kho qhov kub kom ntau (thawb mus rau qhov siab);

(5) isothermal quenching yog saws tsis siv quenching thiab tempering txheej txheem.

Qhov thib ob hom kev mob brittleness no kuj yog hu ua reversible temper brittleness thiab siab kub npau brittleness.Tus kub ntawm 400 ~ 650 ℃,

Yam ntxwv ntawm cov

(1) ntxeev siab;

(2) muaj feem xyuam rau qhov txias txias tom qab kub; Tom qab kub thiab txias txuag, qis txias, tsis txias, tsis tuaj yeem tshwm sim, thiab tom qab hnyav, txias txias tau muab tshem tawm tom qab rov ua dua.

(3) tsis muaj dab tsi ua nrog rau lub xeev ntawm lub koom haum, tab sis M hos qis;

(4) npau nyob rau hauv cheeb tsam chaw nyob, thiab lub embrittlement tom qab temper tsis muaj dab tsi ua rau txias txias;

(5) lub pob zeb tawg yog intergranular brittle jab.

3. Yam teeb meem uas cuam tshuam txog hom thib ob ntawm kev ua siab phem

(1) cov tshuaj lom neeg muaj pes tsawg leeg (2) Ib qhov loj (3) qhov tawv nqaij tom qab kho sov sov

4. Mechanism ntawm kev tsim

(1) thaum muaj mob brittleness, Ni, Cr, Sb, Sn, P, etc. yog tag nrho inclined rau tus thawj grain ciam ntawm ib. lawv tag nrho cov concentrated nyob rau hauv ciam ciam nrog 2 ~ 3 tus kabmob atomic. Qhov kev ua siab phem ua rau muaj kev tiv thaiv ntawm kev ua tsis taus tus kheej.Ni thiab Cr tsis tau tsuas yog muaj self-polymerization, tab sis kuj nce lub polymerization ntawm impurity ntsiab (2) kev quenching tsis muaj tempering los yog tempering tsis embrittlement, tsis muaj segregation phenomenon ntawm alloying ntsiab thiab impurity (3) alloying element Mo tuaj yeem cuam tshuam qhov sib cais ntawm cov kev ua xaim impairment mus rau qhov ciam ciam A, thiab nws tsis thuam nws tus kheej.

Cov lus piav qhia saum toj no: qhov sib cais ntawm Sb, Sn, P thiab lwm yam kev xaim impurity ntsiab rau cov thawj cov ciam teb ntawm A yog qhov tseem ceeb rau ob hom kev mob siab npau taws, thaum Ni thiab Cr tsis tsuas yog txhawb qhov kev sib cais ntawm kev ua tsis taus cov ntsiab lus, tab sis kuj lub segregation nws tus kheej, yog li txo lub zog ntawm qhov ciam ntawm qhov ciam thiab ua rau siab brittleness.

5. Cov hau kev tiv thaiv

(1) txhim kho qhov purity ntawm hlau thiab txo cov impurities;

(2) ntxiv cov txiaj ntsig zoo ntawm kev sib cais xws li Mo thiab W;

(3) rau cov khoom me me thiab qhov yooj yim, txoj kev txias txias sai sai tom qab ua kom txias;

(4) subtempering quenching (A1 ~ A3) saws los ua kom zoo dua grain thiab txo segregation.Thaum heated rau A + F (F yog nplua ib plab), impurities yuav enriched F, thiab F muaj A muaj peev xwm dua rau dissolve impurities, uas tuaj yeem tsis cuam tshuam qhov sib cais ntawm impurities mus rau lub ciam ze ntawm A.

(5) kev kho kub ua kom sov siab yuav kho kom lub qoob loo zoo, ua kom thaj tsam muaj ciam av, thiab txo cov concentration ntawm cov khoom xiam oob khab.

Keywords: cov khoom siv hlau, kev kho kom sov, kub, brittleness

Cim npe nrov: swc-hv roj quenching thiab tempering caij nplooj ntoos hlav steel hlau Tuam Tshoj, chaw tsim tshuaj paus, muab kho, ua nyob rau hauv Suav teb