Ukuthengiswa kwendawo ye-40Cr yentsimbi yombhobho ukuze kuqhutywe
Umbhobho wensimbi we-40Cr luhlobo lwentsimbi engqukuva kunye necandelo elingenanto kwaye akukho malungu ajikeleze. Yenziwe ngombhobho oqinileyo ongenanto ngokugqobhoza, kwaye emva koko yenziwe ngokuqengqeleka okushushu, ukuqengqeleka okubandayo okanye umzobo obandayo. Xa kuthelekiswa nentsimbi ejikelezileyo kunye nezinye isinyithi esiqinileyo, xa ukugoba kunye namandla okujikeleza kufana, ubunzima bombhobho wensimbi bulula, luhlobo lwecandelo lezoqoqosho.
Ngokutsho kwe-GB / T 3077-2008: ukwakheka kweekhemikhali (iqhezu lobuninzi,%) C 0.37 ~ 0.44, Si 0.17 ~ 0.37, Mn 0.50 ~ 0.80, cr0.80 ~ 1.10, Ni ≤ 0.30【 Iimpawu zeMechanical]
Isampulu yesayizi engenanto (mm): 25
Ubushushu bobushushu bokucima kokuqala (℃): 850; Ukupholisa: I-oyile
Ubushushu besibini bokucima ubushushu (℃):-
Ubushushu bobushushu bokufudumeza (℃): 520; Ukupholisa: amanzi, ioli
Amandla okuqina (σ b/MPa): ≧980
Indawo yesivuno (σ s/MPa): ≧785
Ubude emva kokwaphuka (δ 5/%): ≧9
Ukunciphisa indawo (ψ/%): ≧45
Impembelelo yokufunxa amandla (aku2 / J): ≥ 47
Ukuqina kweBrinell (hbs100 / 3000) (ifakwe okanye iqondo lobushushu eliphezulu linomsindo): ≤ 207
Imigangatho yensimbi ye-GB yaseTshayina yi-40Cr, i-DIN impahla No. 1.17035 / 1.7045, DIN 41Cr4 / 42gr4, en 18, BS 41Cr4, AFNOR 42c4, NF 38cr4 / 41Cr4, 4 2 SASS 4, SASS 4, 4, 4, 4 SASS, 4 SAS 4, 42, 4, 41, 4, 4, 4, 4, 4, 4, 41 Cr4, 4 SASS 4, 42c4, 41Cr4, 41. / ASTM Standard Steel No. 5140, Japanese JIS umgangatho steel No. scr440 (H) / scr440, American AISI / SAE / ASTM Standard Steel No. 5140, umbutho ngamazwe Standardization ISO umgangatho wentsimbi No. 41Cr4.
(malunga) ACM = 780 ℃
Ubushushu 850 ~ 870 ℃, ubunzima 179 ~ 229hbs.
Ubushushu ngu-740 ~ 760 ℃, ixesha lokubamba ngu-4 ~ 6h, kwaye ke iqondo lokushisa lipholile ukuya ku-≤ 600 ℃ kwinqanaba lokupholisa le-5 ~ 10 ℃ / h.
Ubunzima ngaphambi kokuba unyango ≤ 217hbs, ubunzima emva kokuthambisa ≤ 163hbs.
(670 ± 10) ℃ × 2H, ukunyuka kwamaqondo obushushu kunye eziko, (710 ± 10) ℃ × 2H, pholisa phantsi eziko, (670 ± 10) ℃ × 2H, ukunyuka kwamaqondo obushushu kunye neziko, (710 ± 10) ℃ × 2H, ngoko ukwehlisa ubushushu kunye eziko, (670 ± 10) ℃ × 2H, ukunyuka kwamaqondo obushushu kunye eziko, (710 ± 10) ℃ × 2H, pholisa phantsi neziko imijikelo 3, uze uphole phantsi ukuya. 550 ℃ yokupholisa umoya. Ubunzima emva konyango yi-153hbs.
Ukucima ubushushu 850 ℃± 10 ℃, ukupholisa ioli; Ubushushu bobushushu 520 ℃± 10 ℃, amanzi, ioyile kunye nokupholisa umoya.
Medium carbon modulated steel, intloko ebandayo die steel. Intsimbi inexabiso eliphakathi kunye nokusebenza lula. Emva konyango olufanelekileyo lobushushu, lunokufumana ubunzima obuthile, iplastiki kunye nokumelana nokunxiba. Ukulungelelanisa kunokukhuthaza i-tissue spheroidization kunye nokuphucula ukusebenza kokusika kwezithuba ezinobunzima obungaphantsi kwe-160hbs. Ishushu kwi-550 ~ 570 ℃, intsimbi ineyona mpahla igqwesileyo yomatshini. Ukuqina kwale ntsimbi kuphezulu kuneyentsimbi ye-45. Ifanelekile kunyango lokuqina komphezulu olufana nokucima amaza amaninzi kunye nokucima umlilo.
Emva kokucima kunye nokufudumala, le ntsimbi isetyenziselwa ukuvelisa iinxalenye zomatshini ezithwele umthwalo ophakathi kunye nesantya esiphakathi, njenge-knuckle yokulawula, i-shaft ye-half-shaft yemoto, i-gear, i-shaft, i-worm, i-spline shaft, i-sleeve yeziko, njl njl kwisixhobo somatshini; Emva kokucima kunye nokufudumala kweqondo lokushisa eliphakathi, isetyenziselwa ukuvelisa iindawo ezithwele umthwalo ophezulu, impembelelo kunye nesantya esiphakathi, njenge-gear, shaft engundoqo, i-oil pump rotor, ibhloko yokutyibilika, ikhola, njl. Emva kokucima kunye nokushisa okuphantsi kweqondo lokushisa, isetyenziselwa ukuvelisa iindawo ezinomthwalo onzima, impembelelo ephantsi, ukuxhatshazwa kokugqoka kunye nokuqina okuqinileyo ngaphantsi kwe-25mm kwicandelo, njengembungu, i-shaft engundoqo, i-shaft, i-collar, njl. Emva kokucima kunye nokucima kunye nokucima umphezulu ophezulu, isetyenziselwa ukwenza iindawo ezinobunzima obuphezulu kunye nokumelana nokunxiba ngaphandle kwempembelelo enkulu, njengegiya, umkhono, i-shaft, i-shaft engundoqo, i-crankshaft, i-spindle, i-pin, intonga yokudibanisa, i-screw, i-nut, ivalve yokungena, njl. Ukongeza, le ntsimbi ikwafanelekile ukuvelisa iindawo ezahlukeneyo zothumelo eziphathwa nge-carbonitriding, njengeegiya kunye neeshafti ezinobubanzi obukhulu kunye nokuqina okuhle kobushushu obuphantsi.
I-Annealed, ubunzima ≤ 207hbs. I-40Cr imodyuli elastiki: imodyuli elastiki E (20 ℃) / MPA 200000 ~ 211700, imodyuli yokucheba G (20 ℃) 80800
Inkqubo yokucima i-40Cr
Ukucima i-40Cr, i-850 ℃, ukupholisa ioli; Ukufudumeza i-520 ℃, ukupholisa amanzi, ukupholisa ioli. Umphezulu wokucima ubulukhuni bombhobho wensimbi we-40Cr yi-hrc52-60, kwaye ukucinywa komlilo kunokufikelela kwi-hrc48-55.
40Cr unyango nitriding
I-40Cr yeyentsimbi ye-nitrided, kwaye izinto zayo zifanelekile kwi-nitriding. I-40Cr inokufumana ubulukhuni obuphezulu bomphezulu emva konyango lwe-nitriding, kwaye obona bunzima buphezulu emva konyango lwe-nitriding bungafikelela kwi-hra72 ~ 78, okt hrc43 ~ 55. Indlela yenkqubo ye-nitriding workpiece: ukucima ukucinywa komatshini kunye nokuphelisa ukucudisa ukucikideka koxinzelelo ukusila. Ngenxa yokuba umaleko we-nitrided ubhityile kwaye ubhityile, kuyafuneka ukuba ube nolwakhiwo olungundoqo oluphezulu, ngoko ke kuyafuneka ukuba kwenziwe unyango lokucima nobushushu kuqala ukuze ufumane i-sorbite enobushushu kwaye uphucule iipropathi zomatshini zondoqo kunye nomgangatho wobushushu. umaleko we-nitrided. I-nitriding ethambileyo iyasebenza, kwaye i-nitriding yegesi iqhele ukusetyenziswa
40Cr ukuwelda
Ngaphambi kwe-40Cr welding, nikela ingqalelo kwi-preheating ukunqanda ukucima ukuqhekeka ngaphakathi kwe-weld ngenxa yokutshatyalaliswa kobushushu be-matrix. Kungcono ukuqheleka ngaphambi kokuba udibanise.
I-Weldability ye-40Cr: kulula ukwahlula ngexesha le-crystallization kwaye inovelwano kwi-crystallization crack (uhlobo oluthile lokuqhekeka kwe-thermal). Kulula ukuqhekeka kwi-crater kunye ne-concave inxalenye kwi-weld ngexesha le-welding. Ngomxholo ophezulu wekhabhoni, kulula ukufumana isakhiwo esinzima (i-martensite) esithinteka kakhulu kwiingqungquthela ezibandayo ngexesha lokupholisa ngokukhawuleza. Xa izinga lokupholisa lendawo eshushu kakhulu likhulu, kulula ukwenza i-hard and brittle high carbon martensite kwaye imbrittle indawo eshushu kakhulu.
1. I-Welding ngokuqhelekileyo iqhutyelwa kwimeko ye-annealed (normalized).
2. Indlela ye-welding ayikhawulelwanga
3.Ubushushu bokufudumala bunokwandiswa ngokufanelekileyo ngamandla amakhulu omgca. Ngokubanzi, iqondo lobushushu preheating kunye interlayer lobushushu kunokulawulwa phakathi 250 ~ 300 ℃.
4. Izinto ze-welding ziya kuqinisekisa ukuba ukubunjwa kwetsimbi egciniweyo ngokusisiseko kufana nesiseko sesinyithi, esifana ne-j107-cr.
5.Ukucima kunye nokufudumala unyango lobushushu kuya kwenziwa ngexesha emva kwe-welding. Ukuba kunzima ukwenza unyango lokucima kunye nokufudumala ngexesha, ukucima okuphakathi okanye ukubamba kwiqondo lokushisa elingaphezulu kunokushisa kwangaphambili ixesha elithile kunokuqhutyelwa ukuphelisa i-hydrogen edibeneyo kunye nokuthambisa isakhiwo. Kwiimveliso ezinokwakheka okuntsokothileyo kunye ne-welds ezininzi, i-annealing ephakathi inokuqhutywa emva kokudibanisa inani elithile le-welds.
