Spot malonda a 40Cr zitsulo chitoliro kuti processing
Chitoliro chachitsulo cha 40Cr ndi mtundu wachitsulo chozungulira chomwe chili ndi dzenje ndipo palibe zolumikizira kuzungulira. Amapangidwa ndi chitoliro cholimba chopanda kanthu pobowoleza, kenako amapangidwa ndi kugudubuza kotentha, kuzizira kozizira kapena kujambula kozizira. Poyerekeza ndi zitsulo zozungulira ndi zitsulo zina zolimba, pamene kupindika ndi mphamvu zowonongeka ndizofanana, kulemera kwa chitoliro chachitsulo ndi chopepuka, chomwe ndi mtundu wa chitsulo chachigawo chachuma.
Malinga ndi GB / T 3077-2008: mankhwala zikuchokera (chigawo misa,%) C 0,37 ~ 0,44, Si 0,17 ~ 0,37, Mn 0,50 ~ 0,80, cr0.80 ~ 1.10, Ni ≤ 0,30【 Mawotchi katundu]
Zitsanzo zopanda kanthu (mm): 25
Kutentha kutentha kwa kuzimitsa koyamba (℃): 850; Zoziziritsa: Mafuta
Kutentha kwachiwiri kozimitsa kutentha (℃):-
Kutentha kwa kutentha (℃): 520; Zozizira: madzi, mafuta
Kulimba kwamphamvu (σ b/MPa): ≧980
Malo otulutsa (σ s/MPa): ≧785
Kutalika pambuyo pakuthyoka (δ 5/%): ≧9
Kuchepetsa kwa dera(ψ/%): ≧45
Mphamvu zamayamwidwe (aku2 / J): ≥ 47
Kuuma kwa Brinell (hbs100 / 3000) (kutentha kapena kutentha kwambiri): ≤ 207
Miyezo yachitsulo ya GB ku China ndi 40Cr, DIN zakuthupi No. 1.17035 / 1.7045, DIN 41Cr4 / 42gr4, en 18, BS 41Cr4, AFNOR 42c4, NF 38cr4 / 41Cr4, 4 SS 2 N42Cr 4, SS 4 N42Cr4 American, SS N42Cr4, 4 SS N42Cr4, 42Cr4, SFNOR 42c4 / ASTM Standard Steel No. 5140, Japanese JIS standard steel No. scr440 (H) / scr440, American AISI / SAE / ASTM Standard Steel No. 5140, bungwe lapadziko lonse la Standardization ISO muyezo zitsulo No. 41Cr4.
(pafupifupi) ACM = 780 ℃
Kutentha 850 ~ 870 ℃, kuuma 179 ~ 229hbs.
Kutentha ndi 740 ~ 760 ℃, nthawi yogwira ndi 4 ~ 6h, ndiyeno kutentha kumakhazikika mpaka ≤ 600 ℃ pa kuzizira kwa 5 ~ 10 ℃ / h.
Kuuma musanayambe mankhwala ≤ 217hbs, kuuma pambuyo kufewetsa ≤ 163hbs.
(670 ± 10) ℃ × 2H, kutentha kukwera ndi ng'anjo, (710 ± 10) ℃ × 2H, kuziziritsa ndi ng'anjo, (670 ± 10) ℃ × 2H, kutentha ndi ng'anjo, (710 ± 10) ℃ × 2H, ndiye kuchepetsa kutentha ndi ng'anjo, (670 ± 10) ℃ × 2H, kutentha kukwera ndi ng'anjo, (710 ± 10) ℃ × 2H, kuziziritsa ndi ng'anjo kwa 3 m'zinthu, ndiyeno kuziziritsa mpaka 550 ℃ kuziziritsa mpweya. Kuuma pambuyo mankhwala ndi 153hbs.
Kuzimitsa kutentha 850 ℃ ± 10 ℃, mafuta kuzirala; Kutentha kutentha 520 ℃ ± 10 ℃, madzi, mafuta ndi mpweya kuzirala.
Sing'anga carbon modulated zitsulo, ozizira mutu kufa chitsulo. Chitsulocho chili ndi mtengo wapakati komanso kukonza kosavuta. Pambuyo pa chithandizo choyenera cha kutentha, imatha kupeza kulimba kwina, pulasitiki komanso kukana kuvala. Normalizing imatha kulimbikitsa spheroidization ya minofu ndikuwongolera magwiridwe antchito opanda kanthu ndi kuuma kosakwana 160hbs. Kutenthedwa pa 550 ~ 570 ℃, chitsulocho chimakhala ndi makina abwino kwambiri. Kuuma kwachitsulo ichi ndikwambiri kuposa chitsulo cha 45. Ndioyenera kupangira mankhwala owumitsa pamtunda monga kuzimitsa pafupipafupi komanso kuzimitsa moto.
Pambuyo kuzimitsa ndi kutentha, chitsulo ichi chimagwiritsidwa ntchito popanga zida zamakina zonyamula katundu wapakatikati ndi liwiro lapakati, monga chiwongolero chowongolera, kumbuyo theka shaft yagalimoto, zida, shaft, nyongolotsi, spline shaft, malaya apakati, etc. pa chida cha makina; Pambuyo kuzimitsa ndi sing'anga kutentha tempering, ntchito kupanga mbali katundu katundu mkulu, zotsatira ndi sing'anga liwiro, monga zida, kutsinde chachikulu, mafuta mpope rotor, kutsetsereka chipika, kolala, etc; Pambuyo pozimitsa ndi kutentha kwapansi, amagwiritsidwa ntchito popanga ziwalo zolemera kwambiri, zotsika kwambiri, kukana kuvala ndi makulidwe olimba osakwana 25mm pagawo, monga nyongolotsi, shaft yaikulu, shaft, kolala, ndi zina zotero; Pambuyo pozimitsa ndi kutentha komanso kuzimitsa kwapamwamba kwambiri, amagwiritsidwa ntchito popanga ziwalo zolimba kwambiri komanso kuvala kukana popanda kukhudzidwa kwakukulu, monga zida, manja, shaft, shaft yaikulu, crankshaft, spindle, pini, ndodo yolumikizira, screw, nati, valavu yolowera, etc. Kuphatikiza apo, chitsulo ichi ndi choyeneranso kupanga magawo osiyanasiyana opatsirana opangidwa ndi carbonitriding, monga magiya ndi ma shaft okhala ndi mainchesi akulu komanso kulimba kwa kutentha kochepa.
Annealed, kuuma ≤ 207hbs. 40Cr zotanuka modulus: zotanuka modulus E (20 ℃) / MPA 200000 ~ 211700, kukameta ubweya modulus G (20 ℃) 80800
Njira yozimitsa 40Cr
40Cr kuzimitsa, 850 ℃, mafuta kuzirala; Kutentha 520 ℃, madzi kuzirala, mafuta kuzirala. Pamwamba pazimitsa kuuma kwa chitoliro chachitsulo cha 40Cr ndi hrc52-60, ndipo kuzimitsa lawi kumatha kufika hrc48-55.
40Cr nitriding chithandizo
40Cr ndi yachitsulo cha nitrided, ndipo zinthu zake zimathandizira kuti nitriding. 40Cr ikhoza kupeza kuuma kwapamwamba pambuyo pa chithandizo cha nitriding, ndipo kuuma kwambiri pambuyo pa chithandizo cha nitriding kumatha kufika hra72 ~ 78, mwachitsanzo, hrc43 ~ 55. Njira yopangira makina opangira nitriding: kupangira machining ang'onoang'ono kuzimitsa ndi kutenthetsa kumaliza kukonza kupsinjika maganizo kuchotsa kugaya kugaya nitriding kumaliza kugaya kapena kugaya. kugaya. Chifukwa wosanjikiza wa nitrided ndi woonda komanso wosasunthika, umayenera kukhala ndi mawonekedwe amphamvu kwambiri, kotero ndikofunikira kuchita zoziziritsa ndi kutentha kutentha koyamba kuti mupeze sorbite yowongoka ndikuwongolera zida zamakina pachimake ndi mtundu wa wosanjikiza wa nitride. Nitriding yofewa imagwira ntchito, ndipo nitriding imagwiritsidwa ntchito kwambiri
40Cr kuwotcherera
Pamaso pa kuwotcherera kwa 40Cr, tcherani khutu pakuwotchera kuti muchepetse mng'alu mkati mwa weld chifukwa cha kutentha kwa matrix. Ndi bwino kuti normalize pamaso kuwotcherera.
Weldability wa 40Cr: ndikosavuta kulekanitsa panthawi ya crystallization ndipo imakhudzidwa ndi crystallization crack (mtundu wa ming'alu yotentha). Ndikosavuta kung'amba m'chigwa ndi kuyika mbali yowotcherera powotcherera. Ndi kuchuluka kwa kaboni, ndikosavuta kupeza mawonekedwe olimba (martensite) omwe amakhudzidwa kwambiri ndi ming'alu yozizira pakuzizira kofulumira. Kuzizira kwa malo otentha kwambiri kukakhala kokulirapo, ndikosavuta kupanga martensite olimba komanso osasunthika kwambiri ndikupangitsa malo otentha kwambiri.
1. Kuwotcherera kumachitika mu annealed (normalized) state.
2. Njira yowotcherera imakhala yochepa
3.Kutentha kwa preheating kumatha kuonjezedwa moyenerera ndi mphamvu yayikulu yama mzere. Nthawi zambiri, kutentha kwa preheating ndi kutentha kwa interlayer kumatha kuyendetsedwa pakati pa 250 ~ 300 ℃.
4. Zida zowotcherera ziyenera kuwonetsetsa kuti zitsulo zoyikidwazo ndizofanana ndi zitsulo zoyambira, monga j107-cr.
5.Kuzimitsa ndi kutentha kutentha chithandizo kudzachitika mu nthawi pambuyo kuwotcherera. Ngati n'kovuta kuchita quenching ndi kutentha mankhwala mu nthawi, annealing wapakatikati kapena kugwira pa kutentha kuposa preheating kwa nthawi akhoza kuchitidwa kuthetsa diffused haidrojeni ndi kufewetsa dongosolo. Pazinthu zomwe zili ndi mawonekedwe ovuta komanso ma welds ambiri, kuyatsa kwapakatikati kumatha kuchitika pambuyo kuwotcherera ma weld angapo.
