mim zvinhu simbi isina tsvina 17-4

MIM 17-4 PH Overview

Kubva pane iyo AISI 17-4 PH chiyero, MIM 17-4 PH ndeye martensitic precipitation-inoomesa simbi isina tsvina. Iyo inosiyaniswa nemusanganiswa wekuramba corrosion uye mechanical hunhu.

Imwe yeanonyanya kushandiswa MIM zvinhu musimbi jekiseni rekugadzira chikamu ndeye 17-4 PH simbi isina tsvina. Iyi simbi ine musanganiswa mukuru wekupokana nekuora, kuoma, uye kusimba. Zvidimbu zvakaoma zvine simba rakanaka zvinogoneka ne17-4 yakasarudzika hunhu. Uyezve, kuomeswa kwechipiri kunoitwa panguva yekuita sintering nekugadzirisa mamwe ma parameter.

Sezvo 17-4 PH inopesana nekuora zvakafanana ne304L, inowanzoshandiswa mumashandisirwo anoda mechanical properties.

Pamusoro pezvo, MIM-17-4 PH inozivikanwa neUNS S17400, AISI 630, ASTM A564, AMS 5643, uye simbi isina tsvina 17-4 PH.

 

Kuumbwa Kwemakemikari

Iyo kemikari inoumbwa yeStainless Steel 17-4 yakanyorwa pazasi, iine zvinhu uye huremu hwazvo hwakasiyana muzana:

• Simbi (Fe):Balance (chikamu chasara)
• Nickel (Ni):3.00-5.00%
• Silicon (Si):1.00%
• Kabhoni (C):0.07%
• Chromium (Cr):15.50-17.50%
• Niobium (Nb):0.15-0.45%
• Manganese (Mn):1.00%
• Mhangura (Cu):3.00-5.00%
• Sarufa (S):0.03%

Iko kuumbwa kunovimbisa kusimba kwechinyorwa, corrosion resistance, uye zvimwe zvivakwa zvakakodzera kune akasiyana maindasitiri ekushandisa.

MIM 17-4 PH simbi isina simbi kazhinji ine hunhu hwemuchina huri 10–25% kuipa kupfuura kugadzirwa 17-4 PH. Zvikonzero zvikuru zvinosanganisira:

Sintering kukanganisa kunosanganisira kuramba kabhoni tsvina, yakachengetwa pores, uye zviyo.
Evaporation-inokonzera kurasikirwa kwezvinhu: Cr, Cu, uye Ni.
Kubatanidzwa kwekusachena: O, C, uye N.

Nekunonoka kunyura, iyo face-centered cubic austenite phase inogadziriswa nekabhoni uye nitrogen zvikamu. Kune rimwe divi, body-centered cubic delta ferrite inomhanyisa kumhanya kwe sintering. Simbi isina simbi 17-4PH inosangana nekunaya kwemvura kunokonzeresa kuoma kukuru uye kusimba, nepo zvakasara delta-ferrite zvichideredza simba. Uyezve, martensite inoitika panguva yekutonhora mushure mekunyura.

Chinhu chakakosha cheMIM zvigadzirwa iokisijeni. Nzvimbo yekutanga yepamusoro yehupfu hwesimbi yakavharwa neokisi yakakwirira, uye huwandu hweokisijeni hunosiyana zvichienderana nenzira yekugadzira hupfu. Mwero weokisijeni wakakwira muMIM 17-4 PH zvikamu zvinotungamira mukusaita ngura uye kuderera kwemaitiro emuchina sezvo maokisijeni aya achibvisa kugona kwechromium kuvharira ngura.

 

The Typical Properties

Imwe nzira yakaomesesa yekugadzira yakaoma, yepamusoro-inoshanda simbi isina tsvina zvikamu iMIM. Peak tembiricha, mwero wekudziya, nharaunda, nguva yekubata, uye hupfu particle size zvese zvinokanganisa mabatiro esimbi isina tsvina 17-4 PH siters. Zvinhu zvakawanda zvinokanganisa kuumbwa kwe17-4 PH alloy, izvo zvinozokanganisa zvikamu zve microstructure, sintering maitiro, uye ekupedzisira maitiro. Nitrogen kubva mugadziriro yemhepo, okisijeni kubva muhupfu kana mhepo, uye kabhoni kubva muhupfu kana bhainda ndizvo zvinonyanya kuumba.

 

Iyo yakakodzera chiyero chesimba, kuomarara, uye kuomarara kuramba kunoita 17-4 PH sarudzo yakakurumbira. Zvigadzirwa muminda yemagetsi, mazino, mushonga, uye zvemuchadenga zvinowana musanganiswa wehunhu unofadza mushure mekurapwa kwekupisa. zvichisiyana zvichienderana nekuumbwa, neshanduko muFe, Ni, Cu, uye Cr. Tembiricha ye solidus inotenderedza 1405 ° C, uye iyo ye liquidus ingangoita 1440 ° C. The mechanical unhu vanoteerera kupisa kurapwa; Kutsemuka kureba kunotangira pa8 kusvika ku14%, goho resimba rinobva pa760 kusvika 1240 MPa, tensile simba rinobva pa1000 kusvika 1340 MPa, uye kuoma kunosvika 43 HRC.

 

Iko kusanganisa kwakasarudzika kwesimba, kuomarara, uye kushorwa kwesimbi kunoita kuti 17-4 PH simbi isina tsvina ive sarudzo inosarudzika muindasitiri yesimbi jekiseni rekuumba. Iyo martensitic Stainless simbi iyo inowanzonaya mvura yakaoma ndeye 17-4 PH.

• Simba guru
• Zvakanyanya kuoma
• Superb resistance kune corrosion
• Kuoma kwekutyoka
• maitiro ekupisa kupisa uye welding

 

Migumisiro yeBinder uye Debinding

Kune simbi isina tsvina 17-4 PH jekiseni kuumba, akawanda binder masisitimu anoshandiswa; inonyanya kufarirwa ndeye 60% filler, 30% musana, uye 10% surfactant.

Nekuti zvakasara zvinosunga zvimisikidzo zvinoshandura okisijeni yekupedzisira kana kabhoni mazinga, debinding ine chekuita pane yekupedzisira maitiro. De-polymerization kana solvent extraction ndiyo danho rekutanga pakubvisa; semuenzaniso, parafini wax inonyungudika muheptane, uye polythylene glycol inonyungudika mumvura inopisa. Uyezve, fuming nitric acid inoshandiswa mu catalytic debinding kubvisa polyoxymethylene. Nzira yakanakisa yekubvisa binder muchikamu chechipiri chekubvisa ndeyekuibata pa600 kusvika 1000 ° C munzvimbo yehydrogen. Iyi nhanho dzimwe nguva inodaidzwa sekuti sintering yekutanga nhanho.

 

Sintering Parameter Impact

Zviverengero zvakasiyana-siyana zvinopindirana panguva yekupisa kwesimbi isina tsvina 17-4 PH kutsanangura iyo yekupedzisira density, chikamu, microstructure, uye maitiro. Izvo zvina zvakakosha zvikamu zvekuongororwa kwenhamba kurapa kupisa, sintering atmosphere, yekutanga oxygen concentration, uye particle size.

Tembiricha ye sintering ine simba rakawanda pane sintered density.

 

Saizi yezvimedu

Surface diffusion ndiyo nzira iyo iyo yekutanga particle bonding panguva yekupisa inoitika; chidimbu chidiki chine nzvimbo yakakura ichasimbisa chisungo chekutanga. Iyo musana wepolymer's particle adhesion inotsiviwa nepamusoro diffusion bonding kana binder pyrolysis yaitika. Kupararira kwemuganho wezviyo kunoda kukura kwemutsipa sezvo sintering bonding pakati pesimbi zvidimbu zvinowedzera kuitira kugadzira miganhu yezviyo pakati pezvimedu. Kana muganhu wezviyo uchiita, hukuru hwezviyo hunoita basa guru mukupisa kana shrinkage inotanga, uye ine inverse effect pane sintering rate. Nekudaro, kukanganisa kwekutanga chidimbu saizi kunogona kupikiswa nekunyanya kupisa kwepamusoro kana nguva refu yekubata.

 

Mhepo

Musimbi isina tsvina, yakajairwa sintering nharaunda sarudzo dzinosanganisira vacuum, hydrogen, nitrogen, hydrogen-nitrogen, uye argon-hydrogen.


Iwo maviri anonyanya kufarirwa mhepo yekupisa yesimbi isina tsvina 17-4 PH ihydrogen uye vacuum. Pane kudonha kunoonekwa kweoxide kana kabhoni yawedzerwa. Zvose silicon nechromium zvinogona kubatirira paokisijeni pasina kabhoni yekuwedzera yegraphite. Kuderedzwa kweokisidhi kunoitika kana tembiricha yakakwira uye mwero wehydrogen wakakwira; dova rakaderera richavimbisa maitiro aya. Iyo inotonhora yepasi oxidation inoitika mushure mekunyungudika inogadzira iyo inongomira yekupfeka yesilicon, simbi, uye chromium inoramba corrosion.

Sesimba rakasimba reaustenite stabilizer, nitrogen ine chekuita mukukura kwemartensite uye ekupedzisira maitiro esimbi isina tsvina. Sezvo inotonhora, nitrogen, inonyungudika mu austenite, inonaya seCr2N. Iyo chromium iri munharaunda yezviyo inoganhurwa ichaderedzwa nekunaya uku, izvo zvinozoita kuti kuparara kwenzvimbo kuitike nekukurumidza. Somugumisiro, tinofanira kudzivirira nitrogen kuti ipinde mumhepo inoputika uye inotonhorera zvikamu pasi pe900 ° C pamwero we200 ° C paminiti. musimbi isina tsvina 17-4 PH kudzivirira kugadzirwa kwechromium nitride.

Graphite zvakare inogadzira yakaderera chikamu kudzvanywa kwekabhoni monoxide muvacuum furnaces, ndosaka graphite vacuum furnaces inobudirira mukutsvaira sintering. Pa1300 ° C uye yakaderera CO partial pressure ye0.001, inogona kushandura chromium oxide kuita chromium.

 

 

Tembiricha uye Heating Rate

Yakajairika sintering cycles zvinosanganisira kubvisa tsvina uye binder burnout maitiro anosanganisira kudziyisa uye kubata pane tembiricha dzakasiyana. Kudzikisa tsvina, tembiricha yakakodzera iri padyo ne1000°C, nepo kwekupedzisira kubviswa kwepolymer, iri pedyo ne600°C.

Simbi isina tsvina 17-4PH inopinda sintering shrinkage mukuyedzwa kwedilatometry pamwero wepamusoro we1250 ° C, nepo yakazara-density (98%) inoda tembiricha yepamusoro ye1300 ° C. Zvisinei, mhangura nechromium zvinozonyunguduka patembiricha dzakakwirira, zvichida zvichikonzera kurasikirwa kwekurapa kwekupisa uye kusaita ngura.

 

Uyezve, kuumbwa kwe delta-ferrite kunobatsirwa nekupisa kukuru; nekukurumidza kupararira, chikamu ichi chichabatsira mukuzara kwekupedzisira. White delta-ferrite colonies uye nzvimbo dzakasviba dzedenderedzwa oxide pores dzinoonekwa mune inotevera micro-chimiro girafu yeMIM 17-4PH mu sintering.

Iyo microstructure ye1260 SS17-4 MIM

 

Kudzora kweCarbon

Munguva yekupisa, kabhoni ndeimwe austenite stabilizer. Kusimba kwepamusoro uye kuomarara kuchawanikwa neakadzika akachengetwa kabhoni emukati mazinga mu17-4, pazasi 0.1 uremu muzana. Simbi isina simbi 17-4 PH's nhanho, densification, uye mechanic hunhu zvese zvichakanganiswa nekabhoni yemukati shanduko.

 

Iyo MIM process's atomized powder, binder residues, debinding cycle, sintering environment, kutanga oxygen, uye peak sintering tembiricha ndezvimwe zvezvinosiyana zvinokanganisa carbon level. Iyo yekutanga inotaridza iyo yekupedzisira kabhoni yemukati panguva yekupisa ndiyo yekutanga oxygen level. Semuyenzaniso, 0.03% kabhoni inorasika panguva yehydrogen sintering ye17-4 gasi atomize hupfu pa1343°C. Uyezve, kunyanya pakudzikira kwakadzika tembiricha, mabinder masara anogona kukonzera kusvibiswa kwekabhoni.

Muhydrogen uye vacuum sintering, kusimba kwesimbi isina simbi 17-4 kunokonzerwa nehuwandu hwekabhoni inochengetwa. Mune H900 kana H1100 kupisa kurapwa, kana mune yakajairwa sintering pa1300 kusvika 1360 ° C. Mufananidzo unotevera unoratidza kuti simba rekusimba rinodzikira sei sezvo kabhoni inokwira.

 

Kuchengeta Nguva

Mukupisa, nguva dzekubata pane tembiricha yepamusoro inowira pakati pe60 ne120 maminetsi. kubva kune sintered density maringe tembiricha uye nguva graph inotevera. Sezvo tembiricha ichikwira kubva 1240 ° C kusvika 1360 ° C, inoratidza inofambira mberi density kubva 96.3% kusvika 98.3%. Iyo sintering compacts inowana yakazara density (98%), mushure me60 maminetsi ekubata. Porosity inobviswa uye mwero wekutsakatiswa kwepore unodzikira panguva iyi. Kurasikirwa kwemiganhu yezviyo uye porosity kuneta ndizvo zvinonyanya kukonzera.

 

Zvakanakira MIM 17-4

High resistance kune ngura
Kupisa kurapwa-kunokonzera zera kuomesa
Industrial simba uye durability
Kunyanya kupikisa kupisa
Yakanakira MIM's yakaoma geometry

 

Mechanical Hunhu

Kana zviri zvezvigadziriso, MIM 17-4 PH inoshandiswa. Favourike hunhu hunofananidzwa isimba, kuoma, uye kureba. Pamusoro pezvo, kuneta, kusimba kwegoho, uye kuomarara kwekutsemuka inyaya dzinokanganiswa nezvakati wandei zvekugadzirisa.

Mufananidzo unotevera unopfupikisa avhareji maparamendi e17-4 PH zvichibva pakuongororwa kwenhamba yemapurojekiti akati wandei eMIM. Sintering paramita ine basa rekutenderera 60% yemusiyano muzvivakwa.

 

Zvinoenderana neiyo MIM indasitiri chiyero, Stainless simbi 17-4 PH inofanirwa kuve neiyo shoma tensile simba re790 MPa, kuomarara kwe27 HRC mushure mekupisa, uye kuoma kwe1070 MPa uye 33 HRC mushure mekupisa kupisa. 4% elongation kune ese ari maviri. Kusimba kwekusimba kwesimbi isina tsvina 17-4PH mushure me1350 ° C sintering uye H900 kupisa kurapwa ndeye 1280 MPa yegasi-atomized poda uye 1136 MPa yemvura-atomized powder. Izvo zvinofanirwa kucherechedzwa kuti gasi atomized poda inokwanisa kuwana kupisa-kugadziriswa tensile simba re1485 MPa ne9% kureba.

 

Resistance to Corrosion

Mhando ina dze sintered Stainless simbi (304, 316, 430, uye 17-4) inoiswa pasi peyakajairwa corrosion kuyedzwa mumamiriro akasiyana siyana. Mhedzisiro yacho inoratidza kuti 17-4 ndiyo idiki inopokana nemamiriro aya. Pamusoro pazvo, nekuti maburi epa sintered components anokonzera corrosion yemunharaunda by concentration polarization, yakarukwa inoshingirira mukuora pane sintered material. Hydrogen sintering uye gasi atomized poda nzira mbiri dzakakurumbira dzekuvandudza corrosion resistance nekuti yakasara okisijeni idhiraivha.

Corrosion kuramba inobatanawo ne biocompatibility. Kana ichienzaniswa netitanium uye cobalt alloys, simbi isina tsvina 17-4 PH ine yakanaka cytotoxicity asi inoshaya kukwikwidza kwese biocompatibility.

 

PH Musika Wekushandisa weMIM 17-4

Hunhu hwakasarudzika hwemakina hunopihwa ne17-4 PH simbi isina tsvina patembiricha yakakwira kusvika 350°C. Pamusoro pezvo, inosimba zvakakwana kune ese ari maviri simbi uye welds, uye warping uye scaling inogona kuderedzwa nekupisa pakadzika tembiricha kwenguva pfupi.

Nekuda kwehukuru hwayo hwekuora uye kushomeka kwekudzivirira, aerospace 17-4 simbi isina tsvina isarudzo yakanaka kune aerospace application. Yakakwira hupfu kuchena uye densification inogona kuve nechokwadi chehupenyu hweMIM 17-4 zvigadzirwa uye kuderedza shanduko yekukanganisa.

Mota
Iyo inonyanya kushandiswa zvinhu mukugadzirwa kwemotokari isimbi isina simbi 17-4 nekuti iri nyore kugadzira kuita akasiyana maumbirwo. Nekusimba kwakanyanya, simbi jekiseni rekuumba tekinoroji inowedzerawo kugona kwayo kune yakaoma geometry.

Vatengi
Nekuda kwekusiyana kwayo nekuramba kwecorrosion, 17-4 inoshandiswa zvakanyanya mumashandisirwo evatengi vachishandisa tekinoroji yeMIM. Uyezve, iyo yakasarudzika simba uye kuomarara kwechinhu ichi chinovimbisa kusakanganisa-isina kushanda.

Mukupedzisa

MIM 17-4 PH inoita nhanho dzinoshamisa mukugadzirisa zvimiro. Kune akawanda akakodzera maapplication, inopa akasiyana-siyana anokwezva musanganiswa we sintered zvivakwa. Sintering tembiricha ndiyo yekutanga inotaridza hunhu hwekupedzisira kana ichienzaniswa nemhando yehupfu, particle size, green density, nguva yekubata, uye mamwe ma paramita. Uyezve, chikamu chiripo mune sintered zvinhu chinokanganisa sintered properties.

Zvichakadaro, post-sintering kupisa kurapwa, sintered density, uye phase morphology zvese zvinokanganisa maitiro. Nepo sintered density inosarudza hunhu, Kupisa Isostatic Kudzvanya (HIP) inovawedzera.

Metal Injection Molding (MIM) iri kuramba ichienderera mberi nesimbi isina tsvina 17-4 PH. Kupa zvimwe zvikumbiro zve sintered 17-4 PH, JHMIM inotsamira pane iyo MIM tekinoroji base.