mim ihe igwe anaghị agba nchara 17-4

Nchịkọta MIM 17-4 PH

Dabere na ọkọlọtọ AISI 17-4 PH, MIM 17-4 PH bụ mmiri ozuzo martensitic-ike igwe anaghị agba nchara. A na-amata ya site na ngwakọta nke nguzogide corrosion na àgwà igwe.

Otu n'ime ihe MIM a na-ejikarị eme ihe na ngalaba ịkpụzi igwe bụ 17-4 PH igwe anaghị agba nchara. Igwe a nwere nnukwu ngwakọta nke nguzogide corrosion, ike siri ike na ike. A na-eme ka mpempe mgbagwoju anya nwere ezigbo ike site na àgwà pụrụ iche nke 17-4. Ọzọkwa, a na-eme hardening nke abụọ n'oge usoro nkwụsịtụ site n'ịgbanwe ụfọdụ paramita.

Ebe ọ bụ na 17-4 PH na-eguzogide corrosion yiri 304L, a na-ejikarị ya eme ihe na ngwa ndị chọrọ nrụ ọrụ.

Na mgbakwunye, MIM-17-4 PH bụ UNS S17400, AISI 630, ASTM A564, AMS 5643, na igwe anaghị agba nchara 17-4 PH.

 

Ngwakọta nke Chemicals

A na-edepụta ihe mejupụtara kemịkalụ nke igwe anaghị agba nchara 17-4 n'okpuru, yana ihe na nha nha nha ha:

• Ígwè (Fe):Nhazi (akụkụ fọdụrụ)
• Nickel (Ni):3.00-5.00%
• Silikon (Si):1.00%
• Carbon (C):0.07%
• Chromium (Cr):15.50-17.50%
• Niobium (Nb):0.15-0.45%
• Manganese (Nn):1.00%
• Ọla kọpa (Cu):3.00-5.00%
• Sulfur (S):0.03%

Ihe mejupụtara ahụ na-eme ka ike ihe dị ike, nguzogide corrosion na ihe ndị ọzọ dabara adaba maka ngwa ụlọ ọrụ dị iche iche.

MIM 17-4 PH igwe anaghị agba nchara na-enwekarị àgwà arụ ọrụ nke dị 10-25% njọ karịa arụrụ 17-4 PH. Ihe ndị bụ isi kpatara gụnyere:

Mmejọ ndị na-eme mkpọtụ na-agụnye adịghị ọcha carbon na-adịte aka, pores echekwabara, na ọka.
Mfu nke ihe ọkụkụ na-ebute evaporation: Cr, Cu, na Ni.
Nsonye adịghị ọcha: O, C, na N.

Site na iji nwayọ nwayọ, akụkụ nke cubic austenite na-eme ka ihu ya kwụsie ike site na ihe carbon na nitrogen. N'aka nke ọzọ, cubic delta ferrite ga-eme ka ọsọ ọsọ nke sintering dịkwuo elu. Igwe anaghị agba nchara 17-4PH na-enweta mmeghachi omume mmiri ozuzo nke na-ebute isi ike na ike dị elu, ebe delta-ferrite fọdụrụnụ na-ebelata ike. Na mgbakwunye, martensite na-eme n'oge oge jụrụ oyi mgbe ọ gbasasịrị.

Akụkụ bụ isi nke ngwaahịa MIM bụ oxygen. Ebe mbụ dị n'elu nke igwe anaghị agba nchara na-ekpuchi ya na oxides dị elu, na ọnụọgụ oxygen dịgasị iche dabere na usoro mmepụta ntụ ntụ. Ọkwa oxygen dị elu na akụkụ MIM 17-4 PH na-eduga na nguzogide corrosion na-adịghị mma yana njirimara arụ ọrụ dị ala ebe ọ bụ na oxides ndị a ga-ewepụ ikike chromium igbochi corrosion.

 

Ihe Njirimara

Usoro ọkaibe maka imepụta akụkụ igwe anaghị agba nchara dị mgbagwoju anya, arụ ọrụ dị elu bụ MIM. Okpomọkụ kacha elu, ọnụego kpo oku, gburugburu ebe obibi, oge njide, yana nha ntụ ntụ niile na-emetụta ka igwe anaghị agba nchara 17-4 PH sinters. Ọtụtụ ihe na-emetụta nhazi nke 17-4 PH alloy, nke n'aka nke ya na-emetụta akụkụ microstructure, omume na-eme ihe, na njirimara kachasị. Nitrogen sitere na ikuku usoro, oxygen sitere na ntụ ntụ ma ọ bụ ikuku, na carbon sitere na ntụ ntụ ma ọ bụ ihe nkedo bụ ihe ndị bụ isi.

 

Ezigbo nguzozi nke ike, isi ike na nguzogide corrosion na-eme ka 17-4 PH bụrụ nhọrọ a ma ama. Ngwaahịa dị na mpaghara elektrọnik, dentistry, ọgwụ na ikuku ikuku na-ahụ ngwakọta nke àgwà na-adọrọ adọrọ mgbe ọgwụgwọ okpomọkụ gasịrị. dị iche iche dabere na nhazi ya, yana mgbanwe na Fe, Ni, Cu, na Cr. Okpomọkụ nke solidus dị gburugburu 1405 Celsius, nke Liquid dị ihe dịka 1440 Celsius. The n'ibu àgwà na-anabata okpomọkụ ọgwụgwọ; mgbaji elongation sitere na 8 ruo 14%, ike na-enweta sitere na 760 ruo 1240 MPa, ike mgbaji sitere na 1000 ruo 1340 MPa, na ike ruru 43 HRC.

 

Ngwakọta pụrụ iche nke ike, isi ike, na nguzogide corrosion na-eme ka igwe anaghị agba nchara 17-4 PH bụrụ nhọrọ kacha amasị na ụlọ ọrụ ịgbanye igwe. Igwe anaghị agba nchara martensitic nke a na-emekarị ka mmiri ozuzo sie ike bụ 17-4 PH.

• Nnukwu ike
• Oke siri ike
• Nnukwu iguzogide corrosion
• Isi ike maka mgbaji
• njirimara nke ọgwụgwọ okpomọkụ na ịgbado ọkụ

 

Mmetụta nke njide na nbido

Maka igwe anaghị agba nchara 17-4 PH injection ịkpụzi, ọtụtụ ihe nkedo usoro na-eji; ndị kasị ewu ewu bụ 60% filler, 30% ọkpụkpụ azụ, na 10% surfactant.

N'ihi na ihe ndị na-ekekọta ihe fọdụrụ ga-agbanwe ikuku oxygen ma ọ bụ carbon ikpeazụ, debinding nwere mmetụta na njirimara ikpeazụ. De-polymerization ma ọ bụ ihe mgbaze bụ nzọụkwụ mbụ na debinding; dịka ọmụmaatụ, paraffin wax na-agbaze na heptane, na polythylene glycol na-agbaze na mmiri ọkụ. Ọzọkwa, a na-eji nitric acid fuming eme ihe na debinding catalytic iji wepụ polyoxymethylene. Ụzọ kachasị mma isi wepụ ihe nkedo na ọkwa nke abụọ nke debinding bụ ijide ya na 600 ruo 1000 Celsius na gburugburu hydrogen. A na-akpọ usoro a mgbe ụfọdụ dị ka mmalite mmalite.

 

Mmetụta Parameter Sintering

Ọtụtụ mgbanwe na-emekọrịta ihe n'oge a na-eme ka igwe anaghị agba nchara 17-4 PH kọwapụta njupụta ikpeazụ, akụkụ, microstructure, na njirimara. Akụkụ anọ bụ isi nke nyocha ọnụ ọgụgụ bụ ọgwụgwọ okpomọkụ, ikuku ikuku, ntinye ikuku oxygen mbụ, na nha nha.

Okpomọkụ na-ekpo ọkụ na-enwe mmetụta kachasị na njupụta siri ike.

 

The size nke ahụ

Mgbasa dị n'elu bụ usoro nke njikọ nke mbụ n'oge sintering na-ewere ọnọdụ; ihe ntakiri nke nwere oke elu ga-ewusi njikọ mbụ ike. A ga-eji nchikota elu igwe dochie anya ihe nrapanye nke mkpụrụ ndụ ihe nkedo polymer ozugbo ozugbo pyrolysis binder ga-ewere ọnọdụ. Mgbasa oke ọka chọrọ ito olu ka njikọta n'etiti irighiri ihe igwe na-abawanye iji mepụta oke ọka n'etiti ụmụ irighiri ihe. Mgbe oke oke ọka na-etolite, oke ọka na-arụ ọrụ dị ukwuu n'ịgbagharị mgbe mbelata na-amalite, ọ na-enwekwa mmetụta na-agbanwe agbanwe na ọnụ ọgụgụ sentering. Otú ọ dị, mmetụta nke mbụ urughuru nha nwere ike counteracted site ukwuu elu okpomọkụ ma ọ bụ ogologo njide oge.

 

The ikuku

N'ime igwe anaghị agba nchara, nhọrọ gburugburu ebe obibi ọkọlọtọ na-agụnye oghere, hydrogen, nitrogen, hydrogen-nitrogen, na argon-hydrogen.


Igwe ikuku abụọ kachasị ewu ewu maka igwe anaghị agba nchara 17-4 PH bụ hydrogen na oghere. Enwere mbelata nke oxide mgbe a na-agbakwunye carbon. Ma silicon na chromium nwere ike ijide oxygen na-enweghị mgbakwunye carbon nke graphite. Mbelata oxide na-eme mgbe okpomọkụ dị elu na ọkwa hydrogen dị elu; obere igirigi ga-ekwe nkwa usoro a. Igwe oyi na-atụ oyi nke na-eme mgbe a na-agbanye ya ga-emepụta ihe mkpuchi nke silicon, ígwè, na chromium nke na-eguzogide corrosion.

Dị ka austenite stabilizer siri ike, nitrogen nwere mmetụta na mmepe nke martensite na njirimara kachasị nke igwe anaghị agba nchara. Ka ọ na-ajụ oyi, nitrogen, nke soluble na austenite, na-ebuli ka Cr2N. A ga-ebelata chromium dị n'akụkụ oke ọka site na mkpọda a, nke ga-eme ka corrosion mpaghara mee ngwa ngwa. N'ihi ya, anyị ga-egbochi nitrogen ịbanye n'ime ikuku na-ekpo ọkụ ma mee ka ihe ndị dị n'okpuru 900 Celsius C dị jụụ na 200 Celsius C kwa nkeji. na igwe anaghị agba nchara 17-4 PH iji gbochie mmepụta nke chromium nitride.

Graphite na-arụpụtakwa obere obere nrụgide nke carbon monoxide n'ime ọkụ na-ekpo ọkụ, nke mere na ọkụ ọkụ graphite na-aga nke ọma n'ịgbapụ oghere. Na 1300 Celsius C na obere nrụgide akụkụ CO nke 0.001, ọ nwere ike ịtụgharị chromium oxide ka ọ bụrụ chromium.

 

 

Okpomọkụ na Ọnụ Ọkụ

Usoro ihe nrịbama a na-ahụkarị gụnyere mkpochapụ adịghị ọcha yana usoro ọkụ ọkụ nke na-agụnye ikpo ọkụ na ijide n'ọnọdụ okpomọkụ dị iche iche. Maka mbelata adịghị ọcha, ezigbo okpomọkụ dị nso na 1000C, ebe maka iwepụ polymer kacha, ọ dị nso 600C.

Igwe anaghị agba nchara 17-4PH na-enweta mbelata nke ukwuu na ule dilatometry na ọnụ ọgụgụ kacha elu nke ihe dịka 1250°C, ebe njupụta zuru oke (98%) na-achọ ka okpomoku kacha elu nke 1300°C. Otú ọ dị, ọla kọpa na chromium ga-ekupụ na okpomọkụ ndị a dị elu, ikekwe na-ebute nkwụsị nke ọgwụgwọ okpomọkụ na nkwụsị corrosion.

 

Na mgbakwunye, njikọ nke delta-ferrite na-enyere aka site na oke okpomọkụ; site na mgbasa ngwa ngwa, usoro a ga-enyere aka na densification ikpeazụ. Ogbe delta-ferrite na-acha ọcha na ebe gbara ọchịchịrị nke oghere oxide okirikiri ka a na-ahụ na eserese micro-structure na-esote MIM 17-4PH na sintering.

Microstructure nke 1260 SS17-4 MIM

 

Njikwa nke Carbon

N'oge usoro ihe nkedo, carbon bụ ihe ọzọ na-eme ka austenite stabilizer. A ga-enweta ike dị elu na ike siri ike site na ọkwa ọdịnaya carbon dị ala na 17-4, n'okpuru pasent 0.1 dị arọ. Akụkụ igwe anaghị agba nchara 17-4 PH, njupụta na njiri arụ ọrụ ga-enwe mmetụta na mgbanwe ọdịnaya carbon.

 

Uzuzu atomized nke usoro MIM, ihe ndị na-ekekọta ihe, usoro nbido, gburugburu ebe obibi, mmalite ikuku oxygen, na oke okpomọkụ bụ ụfọdụ mgbanwe na-emetụta ọkwa carbon. Isi ihe na-achọpụta ọdịnaya carbon kacha mma n'oge mgbụsị akwụkwọ bụ ọkwa oxygen mbụ. Dịka ọmụmaatụ, 0.03% carbon na-efunahụ n'oge hydrogen sintering nke 17-4 gas atomized powders na 1343 ° C. Ọzọkwa, karịsịa n'oge okpomọkụ dị ala, ihe ndị na-ekekọta ihe nwere ike ịkpata mmetọ carbon.

N'ime hydrogen na vacuum sintering, ike tensile nke igwe anaghị agba nchara 17-4 na-emetụta oke carbon nke edobere. Na ma H900 ma ọ bụ H1100 ọgwụgwọ okpomọkụ, ma ọ bụ na ọkọlọtọ sintering na 1300 ka 1360°C. Onyonyo na-esote na-egosi ka ike ntakiri na-agbada nke ọma ka ọdịnaya carbon na-ebili.

 

Idobe Oge

N'ebe a na-eme mkpọtụ, oge njide na okpomọkụ kachasị elu na-ada n'etiti nkeji 60 na 120. site na njupụta siri ike megide ọnọdụ okpomọkụ na eserese oge na-esote. Ka okpomọkụ na-ebili site na 1240°C ruo 1360°C, ọ na-egosi njupụta na-aga n'ihu site na 96.3% ruo 98.3%. Kọmpat ndị a na-emekọ ihe na-enweta njupụta zuru oke (98%), mgbe nkeji 60 ejirichara. A na-ewepụ porosity na ọnụ ọgụgụ nke ikpochapụ pore na-ebelata n'oge usoro a. Ọnwụ nke oke ọka na ike ọgwụgwụ porosity bụ isi ihe kpatara ya.

 

Uru nke MIM 17-4

Nnukwu iguzogide corrosion
Ịdị ike afọ ọgwụgwọ okpomọkụ kpatara
Ike mmepụta ihe na ịdịte aka
Iguzogide okpomọkụ pụtara ìhè
Dị mma maka geometry gbagwojuru anya nke MIM

 

Njirimara igwe

Maka ngwaọrụ nhazi, a na-eji MIM 17-4 PH. Àmụmà atụnyere ọkacha mmasị bụ ike, ike, na elongation. Na mgbakwunye, ike ọgwụgwụ, ike na-enye ike, na mgbaji siri ike bụ okwu nke ọtụtụ mgbanwe nhazi na-emetụta.

Onyonyo na-esote na-achịkọta nkezi parampat nke 17-4 PH dabere na nyocha ndekọ aha nke ọtụtụ ọrụ MIM. Mpempe mkpịrịsị ihe na-ahụ maka ihe dị ka 60% nke mgbanwe dị na akụrụngwa.

 

Dịka ọkọlọtọ ụlọ ọrụ MIM siri dị, igwe anaghị agba nchara 17-4 PH ga-enwerịrị opekempe ike ntanye nke 790 MPa, ike nke 27 HRC mgbe emechara, yana ike nke 1070 MPa na 33 HRC mgbe ọgwụgwọ okpomọkụ gasịrị. 4% elongation maka abụọ. The tensile ike nke igwe anaghị agba nchara 17-4PH mgbe 1350 ° C sintering na H900 okpomọkụ ọgwụgwọ bụ 1280 MPa maka gas-atomized ntụ ntụ na 1136 MPa maka mmiri-atomized ntụ ntụ. Ekwesiri ighota na uzuzu atomized gas nwere ike nweta ike ike nke 1485 MPa na-ekpochapu okpomọkụ na 9% elongation.

 

Nguzogide corrosion

Ụdị igwe anaghị agba nchara anọ (304, 316, 430, na 17-4) na-edobe ule corrosion ọkọlọtọ n'ọnọdụ dị iche iche. Nsonaazụ gosiri na 17-4 bụ nke kacha nta na-eguzogide ọnọdụ ndị a. Ọzọkwa, n'ihi na pores dị na ihe ndị a kpụrụ akpụ na-akpata mmebi nke mpaghara site na nchikota nke itinye uche, ihe ndị a na-emepụta na-eguzogide corrosion karịa ihe ndị a kpụrụ akpụ. Hydrogen sintering na gas atomized ntụ ntụ bụ usoro abụọ ewu ewu iji meziwanye nguzogide corrosion n'ihi na ikuku oxygen fọdụrụnụ bụ ihe ndọghachi azụ.

Nguzogide corrosion na-emetụtakwa biocompatibility. Mgbe atụnyere titanium na cobalt alloys, igwe anaghị agba nchara 17-4 PH nwere ezigbo cytotoxicity ma enweghị asọmpi n'ozuzu biocompatibility.

 

Ahịa Ngwa PH maka MIM 17-4

Igwe anaghị agba nchara 17-4PH na-enye àgwà igwe pụtara ìhè na okpomọkụ dị elu 350ºC. Tụkwasị na nke ahụ, ọ na-adịgide adịgide maka ma ọla vase na welds, na ịhịa aka na ncha nwere ike ibelata site na ikpo ọkụ na obere okpomọkụ maka oge dị mkpirikpi.

N'ihi corrosion ya dị elu na nguzogide okpomọkụ, ikuku igwe anaghị agba nchara 17-4 bụ nnukwu nhọrọ maka ngwa ikuku. Nnukwu ntụ ntụ dị ọcha na densification nwere ike hụ na oge ndụ nke ngwaahịa MIM 17-4 ma belata mgbanwe mgbanwe.

Ụgbọ ala
Ihe a na-ejikarị eme ihe na mmepụta ụgbọ ala bụ igwe anaghị agba nchara 17-4 n'ihi na ọ dị mfe ịhazi n'ụdị dị iche iche. Site n'ịdịte aka dị ukwuu, teknụzụ ịkpụzi ntụtụ igwe na-abawanye ikike ya maka geometry dị mgbagwoju anya.

Ndị ahịa
N'ihi nguzogide corrosion ya pụrụ iche, 17-4 na-ejikarị na ngwa ndị ahịa na-eji teknụzụ MIM. Ọzọkwa, ike pụrụ iche na isi ike nke ihe a na-ekwe nkwa ịrụ ọrụ na-enweghị njehie.

Na ngwụcha

MIM 17-4 PH na-eme ọganihu dị ịtụnanya n'ịkwalite njirimara nhazi. Maka ọtụtụ ngwa kwesịrị ekwesị, ọ na-enye ngwakọta dị iche iche na-adọrọ adọrọ nke sintered Properties. Igwe ọkụ na-ekpo ọkụ bụ isi ihe na-achọpụta njirimara ikpeazụ ma e jiri ya tụnyere ụdị ntụ ntụ, nha urughuru, njupụta akwụkwọ ndụ akwụkwọ ndụ, ogologo oge na-ejide, na ihe ndị ọzọ. Ọzọkwa, usoro nke dị na ihe ndị na-eme ka ọ dị na-emetụta ihe ndị na-emepụta ihe.

Ka ọ dị ugbu a, ọgwụgwọ okpomọkụ na-esote na-esote, njupụta siri ike, na usoro nhazi usoro niile na-emetụta àgwà. Ebe njupụta siri ike na-ekpebi njirimara, Hot Isostatic Pressing (HIP) na-akwalite ha.

Igwe igwe anaghị agba nchara 17-4 PH na-eji igwe anaghị agba nchara (MIM). Iji nye ngwa ndị ọzọ maka sintered 17-4 PH, JHMIM dabere na ntọala teknụzụ MIM.