Dab tsi yog technical indicators for carburizing thiab quenching qhov chaw?

Carburizing thiab quenching tsim ib txheej martensite nrog cov ntsiab lus carbon siab ntawm qhov chaw, uas muaj siab hardness, siab carbide cov ntsiab lus thiab siab hnav tsis kam. Cov tub ntxhais yog cov qauv qis-carbon martensite, yog li qhov kev nyuaj siab saum npoo yog loj. Zuag qhia tag nrho toughness yog siab. Cov yam ntxwv no ua rau carburizing thiab quenching dav siv nyob rau hauv lub zog thiab lwm qhov chaw uas yuav tsum tau hnav tsis kam, siab qaug zog, thiab siab tiv taus qaug zog. Induction hardening muaj cov yam ntxwv ntawm cov cua kub ceev thiab ceev txias, uas ua rau kom cov nplej loj ntawm cov khoom. Thaum tau txais ultra-high hardness, nws tau txais qhov siab dua toughness Performance index, yog li txhim kho qhov ua tau zoo ntawm cov khoom.

1. Abrasion tsis kam

Carburized thiab quenched qhov chaw muaj siab hnav tsis kam vim lub siab hardness thiab carbides ntawm qhov chaw. Induction hardening tuaj yeem tau txais cov hardness siab nyob rau hauv cov ntsiab lus carbon tsawg, thiab hnav tsis kam kuj tseem cuam tshuam rau nws cov microstructure.

20CrMnTiH3 carburizing quenching thiab 45 steel induction quenching yog tsim rau hauv cov qauv coj, nrog hardness ntawm 62 ~ 62.5HRC, kuaj ntawm M-200 hnav kuaj tshuab, thiab cov khoom hnav yog T10 quenched. Tom qab 1.6 lab lub sij hawm hnav, cov qauv carburized poob 4.0 mg thiab induction quenched qauv poob 2.1 mg. Dab tsi yog qhov txheej txheem uas ua rau induction hardened specimens muaj siab hnav tsis kam? Nws tsim nyog kawm.

2. Lub zog

Nws yog feem ntau ntseeg hais tias lub zog muaj feem xyuam rau hardness, thiab tib hardness yuav tau txais tib lub zog. Rau qhov tshwj xeeb, dab tsi lwm yam tsis muaj feem cuam tshuam rau nws? Peb tau sim cov qauv dumbbell-shaped tensile specimens ua los ntawm 20CrMnTiH3 carburizing thiab quenching thiab 45 steel, 40CrH, 40MnBH induction quenching. Qhov zoo ntawm txoj kab uas hla ntawm cov qauv yog 20mm, thiab ntsuas tensile zog yog 819MPa, 1184MPa, 1364MPa, Ntawm 1369MPa, lub zog ntawm ob peb nruab nrab carbon steel qauv tom qab induction quenching yog ho siab dua cov carburized qhov chaw.

Cov txiaj ntsig ntawm ob txheej txheem yog muab piv. Qhov saum npoo ntawm carburized thiab quenched qauv yog high-carbon martensite, carburized txheej yog 1.25mm, hardness yog 62-63HRC, thiab cov tub ntxhais yog tsawg-carbon martensite, thiab hardness yog 32HRC. Qhov saum npoo ntawm induction hardened qauv yog nruab nrab-carbon martensite, qhov tob ntawm txheej hardened yog 3.6 hli, hardness yog 62HRC, thiab cov tub ntxhais yog tempered sorbite, hardness yog 26HRC. Nws tuaj yeem pom tias muaj qhov sib txawv loj hauv qhov tob ntawm cov txheej txheej hardened tau los ntawm ob txoj kev kho mob, thiab induction hardening tuaj yeem tau txais txheej txheej sib sib zog nqus, yog li tau txais ntau dua ib feem ntawm lub zog. Yog li ntawd, thaum tham txog cov txheej txheem ntxiv dag zog yog qhov zoo dua, peb yuav tsum tsis tsuas yog txheeb xyuas nws los ntawm micro foundations, tab sis kuj xav txog nws los ntawm macro foundations.

3. qaug zog

Tom qab carburizing thiab induction hardening, qhov saum npoo ntawm qhov chaw yog zoo zog, thiab ib tug loj residual compressive kev nyuaj siab yog tsim, thiab ob leeg muaj zog dua qaug zog.

Cov iav qhov chaw nrog lub modulus ntawm 2.5 raug xaiv rau kev tshawb fawb, thiab lawv tau carburized thiab quenched nrog 20CrMnTiH3 nrog ib tug carburizing qhov tob ntawm 1.2 hli; 45 steel thiab 42CrMo tau induction hardened nrog cov hniav hauv paus quenching qhov tob ntawm 2.0mm. Lub hardness yog 61 ~ 63HRC, thiab cov hniav yog av tom qab kev kho cua sov. Kev ntsuam xyuas ntawm lub tshuab kuaj kev qaug zog raws li cov txheej txheem thauj khoom uas tau pom hauv daim duab 1. Qhov khoov nruab nrab ntawm qhov qaug zog qhov kawg siab loads ntawm peb cov ntaub ntawv sib txawv thiab cov hniav kub-kho cov hniav yog 18.50kN, 20.30kN thiab 28.88kN, feem. Lub zog qaug zog ntawm 42CrMo induction hardened iav yog 56% siab dua li ntawm 20CrMnTiH3 carburizing thiab quenching, uas muaj cov txiaj ntsig zoo. Txhawm rau txheeb xyuas nws cov txheej txheem, nws yog ib qho tsim nyog yuav tau pib nrog cov txheej txheem hardened, nto compressive kev nyuaj siab, lub plawv qauv thiab hardness.

4. Hu rau lub zog ua kom muaj zog

Rau iav qhov chaw, qhov kev sib cuag qaug zog tsis ua hauj lwm ntawm cov hniav nto kuj yog hom tsis ua hauj lwm tseem ceeb. Lub teeb-lub luag hauj lwm iav muaj qhov yuav tsum tau qis rau kev qaug zog, thiab txawm tias induction hardening tuaj yeem hloov cov carburizing thiab hardening ntawm lub zog tshwj xeeb, qhov ntsuas no yog cov ntsiab lus uas yuav tsum tau soj ntsuam. Peb qhov kev tshawb fawb hauv cheeb tsam no tsis tob txaus.

5. Quenching deformation

Cov txheej txheem carburizing muaj qhov kub thiab txias, lub sijhawm ntev thiab loj quenching deformation. Cov txheej txheem sib tsoo tom ntej yuav ua rau nyias qhov chaw nrog lub zog siab tshaj plaws thiab qhov siab tshaj plaws compressive kev ntxhov siab, ua rau txo qis ntawm lub zog ntawm qhov. Carburizing thiab quenching ntawm lub zog yog nce siv xovxwm quenching tshuab, lub hom phiaj yog txo quenching deformation. Lub deformation ntawm induction hardening yog me me, thiab vim hais tias ntawm lub thickness ntawm quenched txheej, qhov cuam tshuam ntawm kev sib tsoo ntawm hardening qhov tob yog me me.