Ua rau ntawm cov pob dub ntawm qhov chaw ntawm 38CrMoAlstel barel rau kev txhaj tshuaj molding tshuab

38CrMoAl steel tom qab tus me nyuam nitriding, Lub hardness ntawm qhov chaw tuaj yeem ncav cuag ntau dua 1200HV, nitriding txheej tob ntawm 1 hli los yog ntau tshaj, feem ntau siv rau hauv kev tsim khoom ntawm lub zog qaug zog, siab hnav tsis kam qhov chaw, xws li lub ntsiab ncej ntawm lub tshuab dhos txaj, zoo tuab ntsia hlau, cev, lwm yam. [1]. Cov txheej txheem tsim khoom ntawm 38CrMoAl steel yog raws li hauv qab no: Tuag casting ingot → kub forging → blanking forging → central txiav → quenching thiab tempering kho → nitriding kho → machining. Ib qho kev sim ntawm lub cev thiab tshuaj lom neeg thiab kev soj ntsuam tau ua tiav los tshawb pom qhov ua rau ntawm cov pob dub ntawm qhov chaw ntawm lub tog raj kheej..

1 kuaj lub cev thiab tshuaj 1.1 kev soj ntsuam macro

Raws li tau pom los ntawm daim duab 1, muaj qhov ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom

1.2 Tshuaj ntsuam xyuas muaj pes tsawg leeg

Cov qauv raug coj mus rau ntawm qhov chaw dub ntawm qhov chaw ntawm lub tshuab txhaj tshuaj yas, thiab cov tshuaj muaj pes tsawg leeg tau txheeb xyuas. Cov txiaj ntsig tau tshwm sim hauv Table 1, uas qhia tau hais tias nws cov tshuaj muaj pes tsawg leeg yog tag nrho ntawm GB / T 3077-2015 < Standard Pair ntawm Kub Bonded Steel

Kev xav tau ntawm 38CrMoAl steel

1.3 SEM Analysis

Cov qauv raug coj mus rau ntawm qhov chaw dub ntawm qhov chaw ntawm cov khoom ntim ntawm cov yas txhaj tshuaj molding tshuab, thiab tom qab ntxuav los ntawm ultrasonic yoj, FEIQ U AN T A 400F tau siv. Cov tsos ntawm cov pob dub yog cov dej khov qab zib concave qhov, thiab qhov chaw morphology tau pom los ntawm SEM. Raws li tau pom los ntawm daim duab 2, lub qhov ncauj qhov ncauj nta, tsis muaj cov cuab yeej ua tiav.

Cov qauv kev xam phaj hla ntu tau cuam tshuam ntawm qhov chaw dub ntawm qhov chaw ntawm lub tshuab txhaj tshuaj molding lub tog raj kheej, thiab qhov cross section morphology tau pom. Nws tuaj yeem pom los ntawm Fig. 3 tias muaj ntau cov kab nrib pleb hauv ntu ntawm lub tog raj kheej, cov kab nrib pleb hauv cheeb tsam sib txawv yog faib tsis sib npaug, tsis muaj oxidation phenomena thiab non-metallic inclusions nyob ib ncig ntawm cov kab nrib pleb, thiab cov txheej nitride ntawm qhov chaw hauv cheeb tsam ntog tawm.

Nws tuaj yeem pom los ntawm daim duab. 4 tias lub thickness ntawm cov dawb ci txheej (txheej txheej) nyob rau hauv cov txheej nitrided nyob rau saum npoo ntawm lub tog raj kheej yog tsis sib npaug, thiab cov kab nrib pleb hauv thaj tsam tuab ntawm cov txheej nitrided kuj muaj ntau dua, thiab cov kab nrib pleb tawg raws li tus ciam teb. Cov qauv matrix ntawm lub tog raj kheej yog bainite thiab cov nplej loj kuj loj.

2 Kev tsom xam thiab kev sib tham

Cov tshuaj muaj pes tsawg leeg ntawm cov khoom ntim rau cov yas txhaj tshuaj molding tshuab ua raws li cov kev cai ntawm 38CrMoAl steel raws li GB / T3077-2015 tus qauv. Barrel rooj

Muaj cov pob dub. Los ntawm kev txheeb xyuas electron microscope, peb tuaj yeem pom tias cov pob dub ntawm qhov chaw yog cov suab thaj siv lead ua – zoo li pits. Cov kab nrib pleb propagating raws cov ciam teb nplej tuaj yeem pom nyob rau hauv ntu ntawm lub thoob, thiab tsis muaj cov khoom siv oxygenated thiab cov khoom tsis yog hlau nyob ib ncig ntawm cov kab nrib pleb, qhia tias cov kab nrib pleb tsis muaj dab tsi cuam tshuam nrog kev suav nrog hauv cov hlau, thiab cov kab nrib pleb yog tsim tom qab kev kho cua sov. Cov txiaj ntsig ntawm kev ntsuam xyuas metallographic qhia tau tias muaj cov kab nrib pleb ntau dua nyob rau hauv cov txheej tuab ntawm lub teeb dawb hauv cov txheej nitriding, thiab lub thickness ntawm lub zos dawb ci txheej tshaj 50 m m. Cov qauv ntawm lub tog raj kheej substrate yog Bayesian thiab cov nplej yog ntxhib.

Cov kev tshawb fawb tau pom tias tom qab nitriding ntawm lub workpiece, cov dawb ci txheej nyob rau saum npoo nitriding txheej yog tsim los ntawm ib lossis ob ntawm xi theem, e theem, Ib 'phase, tseem hu ua cov txheej txheej, vim nws tsis yooj yim rau corroded los ntawm etchant zoo tib yam, yog li nws yog dawb ci nyob rau hauv lub kub theem tso saib micro daim iav [2-3]. Kong Dequn et al.. [5] txoj kev tshawb no qhia tau hais tias cov qauv matrix ua ntej nitriding muaj feem cuam tshuam rau lub thickness ntawm cov dawb ci txheej tom qab nitriding.. Lub coarser lub grain loj ntawm cov qauv matrix, qhov tsis sib xws ntawm cov xim dawb ci tom qab nitriding, thiab nquag mus xoob phenomenon. Uniform thiab me me recycled sorbite fabrics tuaj yeem tau los ntawm 38 CrMoAl steel tom qab tempering kho [6] , tab sis batch ntawm kev ua hauj lwm tom qab quenching thiab tempering ua, cov nplej loj loj, ua rau kev tsim ntawm ib txheej ntawm qhov tsis sib xws ntawm qhov chaw ntawm lub workpiece tom qab nitriding dawb ci txheej. Cov txheej dawb ci tsim rau saum npoo ntawm lub thoob tom qab nitriding muaj zog hardness thiab tuaj yeem txhim kho qhov hnav tsis kam ntawm workpiece.. Txawm li cas los, lub teeb dawb txheej feem ntau muaj cov brittleness loj dua, thiab nrog rau qhov nce hauv thickness ntawm lub teeb dawb txheej, lub teeb dawb txheej yuav xoob (tsis ntom), xws li txiv hmab txiv ntoo sandwich xoob, Nyob rau hauv lub workpiece polishing yuav tshwm sim tev, peeling thiab lwm yam tshwm sim zoo li [4]. Cov kev tshawb fawb ntsig txog qhia tau hais tias [7-9], Rau lub saum npoo hardness ntawm lub workpiece, Xws li kev kho mob hauv nplaim taws lossis nitriding kev kho mob ntawm lub workpiece, Hauv Machine, xws li tswj cov txheej txheem sib tsoo, tuaj yeem zam lub tiam kev sib tsoo.

Hauv cov ntsiab lus, Lub barrel nto nitrriding tsis xwm yeem, Hauv cov txheej txheem sib tsoo, Nitrived Txheej Txheem Dawb Txheej Txheej Txheej Txheej Txheej Txheem Qav Cracking Thiab Nitrived Mat Spalling Prenomenon, uas yog lub thoob dej dub dub me ntsis xws li tsis xws luag lub ntsiab.

Xaus thiab Kev Pom Zoo

(1) Tsis xwm yeem nitrividing nyob rau saum npoo ntawm 38 C r m o l hlau lub tog raj kheej rau txhaj tshuaj molding tshuab

Cev khaub ncaws tseem ceeb, Nyob rau hauv cov txheej txheem ntawm machining, lub thicker cheeb tsam ntawm cov txheej nitrided nyob rau saum npoo ntawm lub tog raj kheej tawg raws cov siv lead ua thiab tev tawm ntawm nitrided txheej., tsim ib lub qhov punctate, uas yog qhov laj thawj tseem ceeb rau qhov chaw dub ntawm qhov chaw ntawm lub tog raj kheej.

• Nws tau pom tias cov qauv zoo li qub thiab zoo sorbite tuaj yeem tau los ntawm kev ntxiv thiab kho qhov kev ntxhib los mos kom ntseeg tau tias cov qauv zoo li qub thiab zoo sorbite ntawm lub tog raj kheej.. Rau lub workpiece nrog high deg hardness, xim yuav tsum tau them rau hom clamping ntawm lub workpiece nyob rau hauv tus txheej txheem ntawm machining, yog li kom tsis txhob sib tsoo qhov tsis xws luag tshwm sim los ntawm clamping ntawm lub workpiece.

Yog tias koj muaj lus nug txog kev lag luam yas,plz xav tias dawb nug FLYSE pab pawg,peb yuav muab kev pabcuam zoo tshaj rau koj！ Peb tseem tuaj yeem muab khoom rau koj zoo tab sis pheej yig txhaj tshuaj molding tshuab! Los yog hu rau peb ntawm Facebook.