Ebe ire nke 40Cr ígwè ọkpọkọ maka nhazi
Ọkpụkpụ ígwè 40Cr bụ ụdị nchara gburugburu nke nwere oghere oghere na enweghị nkwonkwo gburugburu. A na-eme ya site na ọkpọkọ siri ike nke oghere site na perforation, wee mee ya nke ntụgharị ọkụ, ntụgharị oyi ma ọ bụ eserese oyi. N'iji ya tụnyere ígwè gburugburu na ígwè ndị ọzọ siri ike, mgbe ike na-ehulata na ike torsional bụ otu, ịdị arọ nke ọkpọkọ ígwè dị ọkụ, nke bụ ụdị akụkụ akụ na ụba nke ígwè.
Dị ka GB / T 3077-2008 si kwuo: ihe mejupụtara kemịkalụ (ọnụọgụ oke,%) C 0.37 ~ 0.44, Si 0.17 ~ 0.37, Mn 0.50 ~ 0.80, cr0.80 ~ 1.10, Ni ≤ 0.30【 Mechanical Njirimara]
Nha oghere (mm): 25
Igwe ọkụ ọkụ nke mbụ quenching (℃): 850; Igwe oyi: Mmanụ
Okpomọkụ ikpo ọkụ nke abụọ (℃):
Igwe ọkụ na-ekpo ọkụ (℃): 520; Coolant: mmiri, mmanụ
Ike ntanye (σ b/MPa): ≧980
Ebe mkpụrụ (σ s/MPa): ≧785
Ntugharị mgbe agbajichara (δ 5/%): ≧9
Mbelata mpaghara (ψ/%): ≧45
Ike nnabata mmetụta (aku2/J): ≥ 47
Brinell hardness (hbs100/3000) (annealed ma ọ bụ elu okpomọkụ): ≤ 207
Ọkọlọtọ ígwè akara ule nke GB na China na-40Cr, Din ihe Mba 1.17035 / 1.7045, DIN 41Cr4 / 42gr4, en 18, Bs 41Cr4, AFNOR 42c4, NF 38cr4 / 41Cr4, uni 41Cr4, NbN 42cr4, SS 2245 American AISI / SAE / ASTM Standard Steel No. 5140, Japanese JIS ọkọlọtọ ígwè No. scr440 (H) / scr440, American AISI / SAE / ASTM Standard Steel No. 5140, mba nzukọ maka Standardization ISO ọkọlọtọ ígwè Nke 41Cr4.
(ihe dị ka) ACM = 780 ℃
Okpomọkụ 850 ~ 870 ℃, ike 179 ~ 229hbs.
The okpomọkụ bụ 740 ~ 760 ℃, na-ejide oge bụ 4 ~ 6h, na mgbe ahụ, okpomọkụ na-mma na ≤ 600 ℃ na obi jụrụ ọnụego nke 5 ~ 10 ℃ / h.
Isi ike tupu ọgwụgwọ ≤ 217hbs, isi ike mgbe ọ dị nro ≤ 163hbs.
(670 ± 10) ℃ × 2H, okpomọkụ ịrị elu na ọkụ, (710 ± 10) ℃ × 2H, jụụ na ọkụ, (670 ± 10) ℃ × 2H, okpomọkụ ịrị elu na ọkụ, (710 ± 10) ℃ × 2H, wee belata okpomọkụ na ọkụ, (670 ± 10) ℃ × 2H, okpomọkụ ịrị elu na ọkụ, (710 ± 10) ℃ × 2H, jụụ na ọkụ maka 3 cycles, wee jụụ ruo 550 ℃ maka ikuku jụrụ oyi. Isi ike mgbe ọgwụgwọ gasịrị bụ 153hbs.
Quenching okpomọkụ 850 ℃ ± 10 ℃, mmanụ jụrụ; Ọnọdụ okpomọkụ 520 ℃ ± 10 ℃, mmiri, mmanụ na ikuku jụrụ oyi.
Ọkara carbon modulated ígwè, oyi isi anwụ anwụ ígwè. Nchara ahụ nwere ọnụ ahịa dị oke ọnụ na nhazi dị mfe. Mgbe ọgwụgwọ okpomọkụ kwesịrị ekwesị, ọ nwere ike nweta ụfọdụ siri ike, plasticity na iyi mgbochi. Normalizing nwere ike ịkwalite spheroidization anụ ahụ ma melite arụmọrụ ịkpụ nke oghere na ike siri ike na-erughị 160hbs. Iwe na 550 ~ 570 ℃, ígwè nwere ihe kasị mma keukwu n'ibu Njirimara. Ịdị ike nke ígwè a dị elu karịa nke ígwè 45. Ọ dabara maka ọgwụgwọ ike nke elu dị ka nkwụsị nke ukwuu na imenyụ ọkụ.
Mgbe quenching na tempering, a nchara na-eji rụpụta n'ibu akụkụ na-ebu ọkara ibu na ọkara ọsọ, dị ka steri knuckle, n'azụ ọkara aro nke ụgbọala, gia, aro, worm, spline aro, center aka uwe, wdg na igwe ngwá ọrụ; Mgbe quenching na ọkara okpomọkụ tempering, ọ na-eji na-emepụta akụkụ na-ebu ibu ibu, mmetụta na ọkara ọsọ, dị ka gia, isi aro, mmanụ mgbapụta rotor, sliding ngọngọ, olu akwa, wdg; Mgbe emenyụ na okpomọkụ dị ala, a na-eji ya na-emepụta akụkụ ndị nwere ibu dị arọ, mmetụta dị ala, na-eyi nguzogide na ọkpụrụkpụ siri ike na-erughị 25mm na ngalaba, dị ka ikpuru, isi ogwe, ogwe aka, olu akwa, wdg; Mgbe quenching na tempering na elu-ugboro ugboro n'elu quenching, ọ na-eji na-emepụta akụkụ na elu elu ike isi ike na-eyi nguzogide na-enweghị mmetụta dị ukwuu, dị ka gia, aka uwe, aro, isi aro, crankshaft, spindle, pin, njikọ mkpanaka, ịghasa, nut, valvụ mbata, wdg. Tụkwasị na nke a, ígwè a dịkwa mma maka ịmepụta akụkụ dị iche iche nke nnyefe nke carbonitriding na-emeso, dị ka ngwo na ogwe nwere nnukwu dayameta na ezigbo okpomọkụ siri ike.
Annealed, isi ike ≤ 207hbs. 40Cr na-agbanwe modul: ihe na-agbanwe modul E (20 ℃) / MPA 200000 ~ 211700, shiee modulus G (20 ℃) 80800
Usoro nkwụsị nke 40Cr
40Cr quenching, 850 ℃, mmanụ jụrụ; Tempering 520 ℃, mmiri jụrụ oyi, mmanụ jụrụ oyi. Igwe nchara nchara nchara 40Cr bụ hrc52-60, ọkụ na-emenyụ ọkụ nwere ike iru hrc48-55.
40Cr ọgwụgwọ nitriding
40Cr bụ nchara nitrided, ihe ndị ya na-eme ka nitriding. 40Cr nwere ike nweta elu elu hardness mgbe nitriding ọgwụgwọ, na kasị elu ike ọgwụgwụ mgbe nitriding ọgwụgwọ nwere ike iru hra72 ~ 78, ie hrc43 ~ 55. Nitriding workpiece usoro ụzọ: forging annealing siri ike machining quenching na tempering imecha machining stress mwepụ siri ike egweri nitriding finishing ma ọ bụ. egweri. N'ihi na nitrided oyi akwa bụ mkpa na kenkuwa, ọ na-achọrọ ka a elu-ike isi Ọdịdị, n'ihi ya, ọ dị mkpa iji mepụta quenching na tempering okpomọkụ ọgwụgwọ mbụ iji nweta tempered sorbite ma melite n'ibu Njirimara nke isi na àgwà nke. oyi akwa nitrided. Nitriding dị nro bụ nitriding na-arụ ọrụ, na nitriding gas na-ejikarị
40Cr ịgbado ọkụ
Tupu ịgbado ọkụ 40Cr, leba anya na ikpo ọkụ ka ị ghara imenyụ mgbawa n'ime weld n'ihi oke ọkụ matriks. Ọ kacha mma normalize tupu ịgbado ọkụ.
Weldability nke 40Cr: ọ dị mfe ikewapụ n'oge kristal na ọ na-enwe mmetụta maka mgbawa crystallization (ụdị mgbape ọkụ). Ọ dị mfe ịgbawa na oghere oghere na akụkụ concave na weld n'oge ịgbado ọkụ. Site na ọdịnaya carbon dị elu, ọ dị mfe ịnweta nhazi siri ike (martensite) nke na-enwe mmetụta nke ukwuu na mgbawa oyi n'oge oyi ngwa ngwa. Mgbe ọnụego jụrụ oyi nke mpaghara ekpo oke ọkụ buru ibu, ọ dị mfe ịmepụta carbon martensite siri ike na nke na-emebi emebi ma mebie mpaghara ekpo oke ọkụ.
1. A na-arụkarị ịgbado ọkụ na steeti annealed (normalized).
2. Usoro ịgbado ọkụ adịghị oke
3.Enwere ike ịbawanye okpomọkụ na-ekpo ọkụ nke ọma site na nnukwu ike linear. N'ozuzu, preheating okpomọkụ na interlayer okpomọkụ nwere ike ịchịkwa n'etiti 250 ~ 300 ℃.
4. Ihe ịgbado ọkụ ahụ ga-ahụ na ihe mejupụtara nke ọla edobere bụ isi na nke metal ntọala, dị ka j107-cr.
5.A ga-eme ọgwụgwọ ikpo ọkụ na ikpo ọkụ n'oge ịgbado ọkụ. Ọ bụrụ na ọ siri ike ịme ọgwụgwọ na-ekpo ọkụ na iwe ọkụ n'oge, annealing etiti ma ọ bụ ijide na okpomọkụ dị elu karịa preheating ruo oge ụfọdụ nwere ike ime iji kpochapụ hydrogen gbasasịrị ma mee ka usoro ahụ dị nro. Maka ngwaahịa ndị nwere usoro dị mgbagwoju anya na ọtụtụ welds, enwere ike ịmegharị etiti etiti mgbe ịgbadochara ụfọdụ ọnụọgụ welds.
