Isishwankathelo: Ukuthelekisa okusebenzayo kwe-Stellite 6 kunye ne-Stellite 21, echaza indlela umxholo wekhabhoni kunye ne-tungsten-versus-molybdenum eqhuba ngayo ubunzima kunye nobunzima bokurhweba.
I-Stellite 6 kunye ne-Stellite 21 zezona zimbini zokunxiba ezisekwe kwi-cobalt zihlala zithelekiswa enye kwenye. Ukungagqibeki okuqhelekileyo kukuchaza iStellite 6 nanini na kukho ukungaqiniseki. Lo mkhwa unesiseko esifanelekileyo: I-Stellite 6 inembali ende yesicelo, ukuziphatha okubhalwe kakuhle, kunye namava okusebenza okuqolileyo. Kodwa kwiimeko ezimbini ukusilela kungazisa umngcipheko ongeyomfuneko: xa inxalenye ibona ukuhamba ngebhayisikile ye-thermal ngokukhawuleza okanye ukutshitshiswa kwe-thermal, kwaye xa inxalenye ineendonga ezincinci okanye utshintsho lwecandelo ngokukhawuleza.
I-Stellite 21 ikhona ubukhulu becala ukulungisa umda wokuqina kweStellite 6 kwezo meko. Ukuqonda ukurhweba phakathi kwezi zibini luncedo ngakumbi kunokukhumbula ukuba yeyiphi "engcono."
Umahluko wokuqulunqwa uqhuba ukwahlulwa komsebenzi
Umsantsa wokusebenza phakathi kwezi ngxubevange wehlela kwiindlela ezimbini zokukhetha.
Umxholo wekhabhoni. IStellite 6 inomgangatho ophezulu kakhulu wekhabhoni. Ngaphantsi kwe-SAE AMS 5387, i-Stellite 6 castings ine-nominal composition ye-60Co-29Cr-4.5W, kunye ne-carbon ngokuqhelekileyo kwi-0.9-1.4% yoluhlu lweemveliso eziphosiweyo. Ikhabhoni eyongezelelekileyo ithetha imvula eyongezelelekileyo ye-carbide, ephakamisa ngokuthe ngqo ubulukhuni kunye nokumelana nokunxiba. I-Stellite 21 inekhabhoni ephantsi kakhulu, kunye nokubunjwa okuqhelekileyo kwe-C ~ 0.25%, i-Cr 25-30%, i-Mo 4.5-6.5%, i-Ni 1.5-3.5%, i-balance Co. I-carbon ephantsi ithetha i-carbide volume fraction kunye ne-microstructure elawulwa yi-cobalt solid-solution matrix.
I-Tungsten ngokuchasene ne-molybdenum. I-Stellite 6 isebenzisa i-tungsten (W) njengeyona nto iphambili yokuqinisa isisombululo; I-Stellite 21 ithatha indawo eninzi yaloo tungsten nge-molybdenum (Mo). I-Molybdenum inobunzima obumalunga nesiqingatha sobunzima be-athomu ye-tungsten, ngoko ke kwipesenti yobunzima obufanayo igalela malunga ne-athomu ephindwe kabini. I-Molybdenum nayo inobudlelwane obunamandla bekhabhoni kwaye ithande ukukhuthaza ukubunjwa kwe-carbide. Kwi-Stellite 21, nangona kunjalo, inqanaba lekhabhoni ephantsi linciphisa eso siphumo, kwaye isiphumo singumxholo osezantsi kakhulu we-carbide kune-Stellite 6.
Ngokudibeneyo, lo mahluko mabini uvelisa iiprofayili ezimbini ezahlukeneyo zokusebenza.
I-Stellite 6: Ubuninzi be-carbide ngokutshintshiselana nokumelana nokunxiba
I-microstructure ye-Stellite 6 iqulethe i-matrix ye-cobalt-based solid-solution matrix kunye nokusabalalisa okuxineneyo kwamaqhekeza e-carbide enzima. Esi sakhiwo senza kakuhle phantsi kokugqoka kwe-abrasive.
Apho ingena khona. Ubuso bevalve yokutywina, imikhono yempompo, izinto zokuphatha oluludaka, kunye neendawo zokunxiba jikelele phantsi kwempembelelo ephakathi zizinto eziqhelekileyo zeStellite 6. Ubunzima bayo buhlala buwela kuluhlu lwe-Rockwell C 37-45, kuxhomekeke kwimeko yokuphosa kunye nonyango olulandelayo lobushushu, olwaneleyo kwiingxaki ezininzi zokunxiba. Kwiindawo ezinobushushu obuphezulu be-oxidizing, i-Stellite 6 nayo yenza umaleko we-oxide okhuselayo osekelwe ikakhulu kwi-Cr₂O₃ kunye ne-CoCr₂O₄, enezinga eliphantsi le-oxidation kune-Stellite 21.
Apho imida ibonakala khona. Ubuninzi be-carbide bunempembelelo yecala: phantsi kwebhayisikile ye-thermal ekhawulezayo okanye ukutshitshiswa kwe-thermal yendawo, umehluko wokwandiswa kwe-thermal phakathi kwe-carbides kunye ne-matrix ingaba yindawo yokuqaliswa kwe-crack. Kumacandelo amancinci, i-carbon ephezulu kunye nomxholo we-carbide unokuphakamisa umngcipheko wokuqhekeka ngexesha lokuphosa kunye nomatshini. Oku akuthethi ukuba iStellite 6 ayinakusetyenziswa kwezi meko, kodwa xa ukudinwa kwe-thermal kuyeyona ndlela ibalaseleyo yokungaphumeleli, enye indlela kufuneka ivavanywe nzulu.
I-Stellite 21: umxholo ophantsi we-carbide ngokutshintshiselana nokuqina kunye nokumelana nokudinwa kwe-thermal
I-Stellite 21 ilandela ingqiqo yoyilo olwahlukileyo. Umxholo wayo ophantsi wekhabhoni kunye ne-molybdenum ukongeza ngokukhawuleza ukunciphisa umthamo we-carbide, ukushiya i-cobalt eqinile-isisombululo se-matrix njengesigaba esithwala ukusebenza komatshini.
Isiphumo esithe ngqo: Ubunzima bobushushu begumbi kunye nokunganyangeki okucocekileyo kokunxiba kungaphantsi kune-Stellite 6, kodwa ukuqina, ukuxhathisa ukothuka kwe-thermal, kunye nokumelana nokudinwa kwe-thermal kungcono. Ukuqina kwe-As-cast ngokuqhelekileyo kuxelwe kwi-HRC 30s ephantsi ukuya phakathi, ngaphantsi kwe-Stellite 6 (amaxabiso achanekileyo axhomekeke kwifom yemveliso kunye nemeko yovavanyo - qinisekisa ngokuchasene nomthengisi ngaphambi kokuchaza). Inzuzo yayo ayikho ngaphandle kwe-abrasives yokunxiba kodwa igcina ingqibelelo yesakhiwo phantsi kwebhayisikile ye-thermal.
Apho ingena khona. I-Stellite 21 isetyenziswe kwiiblawudi ze-injini yegesi, iivalvu ezisebenza ngokushushu, iziqhoboshi ezinobushushu obuphezulu, kunye nokwaleka kweweld ekufuneka kuthintele ukungahambelani kokwandiswa kwe-thermal. Apho iStellite 6 sisebenza njengomaleko ongaphezulu kwaye kufuneka umaleko ophakathi, iStellite 21 ngokwembali ibisetyenziswa njengesithinteli ukuthambisa umahluko wokwandiswa kwe-thermal phakathi kwe-substrate yentsimbi kunye ne-Stellite 6 umaleko ophezulu. Uphononongo kwii-substrates zensimbi ze-F91 ezine-Stellite 21 buffer layers, ezineminyaka engama-550-650 ° C ukuya kuthi ga kwiiyure ze-8,760, zifumene ilahleko ebalulekileyo yokuqina kwempembelelo kwi-interface ye-F91 / S21, yiyo loo nto i-nickel-based buffer layers ithandeka ngakumbi kweso sicelo esithile. Oku kubonisa kakuhle indawo ye-alloy: ixabiso layo lilele ekuqineni phantsi kweemeko ezithile, kungekhona ekutshintsheni i-Stellite 6 yonke indawo.
Umda otyeshelwa ngokulula. I-Stellite 21 inokumelana okulinganiselweyo nokhukuliseko lwamasuntswana alukhuni. Ngenxa yokuba i-carbide density iphantsi, i-matrix inika ukhuseleko oluncinci xa amaqhekeza abukhali abetha ngesantya. Ngaphantsi kokukhukuliseka kwe-angle ephantsi kunye ne-hard abrasive wear, i-Stellite 21 ngokuqhelekileyo ayilona khetho lungcono.
Indlela esebenzayo yokukhetha
Umzila olandelayo usekelwe kwiimpawu zokusebenza ze-alloys ezimbini. Ingasebenza njengesikhokelo sovavanyo lokuqala kodwa akufuneki ithathe indawo yovavanyo lobunjineli besicelo esithile.
Yaya ngakwiStellite 6 xa:
- Eyona ndlela ibalaseleyo yokungaphumeleli kukunxiba okanye ukuncamathelisa, kwaye ukukhwela ibhayisekile nge-thermal ayingomthwalo omkhulu.
- Inxalenye inecandelo elishinyeneyo, kwaye uvakalelo lokuqhekeka ngexesha lokuphosa kunye nomatshini luyalawuleka.
- Ukushisa kwenkonzo kuphezulu kwi-atmospheric oxidizing, kunye nomgangatho okhuselekileyo we-oxide yinxalenye yoyilo.
- Isicelo sinembali yeStellite 6 esekiweyo enedatha yokungaphumeleli kwireferensi.
Yaya ngakwiStellite 21 xa:
- Inxalenye iphinda ifudumale ngokukhawuleza kunye nokupholisa, kwaye ukudinwa kwe-thermal kuyingozi eyaziwayo.
- Inxalenye ineendonga ezinqabileyo okanye utshintsho olukhawulezayo lwecandelo, kwaye ukuqina kubaluleke ngaphezu kobunzima obuluhlaza.
- Umaleko oguqukayo uyafuneka phakathi kwe-substrate yentsimbi kunye nobuso obuqinileyo kwi-buffer yokwandisa ubushushu obungahambelaniyo (kodwa uzinzo lwexesha elide lobushushu obuphezulu kufuneka luvavanywe).
- Indlela yokunxiba ubukhulu becala yintsimbi ukuya kwintsimbi yokutyibilika okanye i-cavitation kunokhukuliseko oluqinileyo.
Xa kungekho mlingane ococekileyo: Ukuba isicelo sifuna ukunyanzeliswa kwe-abrasive abrasive kunye ne-thermal fatigue resistance, i-Stellite 12 (ikhabhoni ephezulu, i-high wear resistance) okanye intsapho ye-Tribaloy ye-alloys eyomeleziweyo eyomeleziweyo inokufaneleka ukuqwalaselwa, okanye inxalenye yolawulo lwe-thermal lunokufuneka lulungiswe kwinqanaba loyilo. Olu lwalathiso lungaphaya kolu thelekiso kodwa lukwinqanaba lokuqala lophononongo lwemathiriyeli.
Yintoni enokubandakanya kwi-RFQ
Nokuba yeyiphi ialloyi ekhethiweyo, umthengisi wokusa kunye nomatshini uhlala efuna oku kulandelayo ngaphambi kokuba anike isicatshulwa esinentsingiselo:
- Imizobo yenxalenye kunye nemilinganiselo engundoqo kunye neemfuno zokunyamezela.
- Iimeko zenkonzo: Uluhlu lweqondo lokushisa, eliphakathi, kunye nohlobo lomthwalo (ukunxiba, impembelelo, ukuhamba ngebhayisikili eshushu).
- Ubomi obulindelekileyo okanye indlela yokusilela eyaziwayo, nenxalenye yembali ukuba ikhona.
- Umgangatho wezinto eziphathekayo, umzekelo ingaba i-AMS 5387 okanye enye ingcaciso esebenzayo kufuneka ihlangatyezwe.
- Ubungakanani, ekubeni iziqwenga ezingatshatanga, iibhetshi ezincinci, kunye nomthamo wemveliso ukhokelela ekukhethweni kwenkqubo eyahlukileyo.
Ukwenziwa kwe-cobalt-based alloy castings, kuyafaneleka ukuba uqinisekise ukuba umthengisi unamandla angaphakathi kwindlu ukusuka ekugaleleni ngomatshini wokugqiba, kuba ezi ngxube zisebenza nzima ngokubonakalayo kwaye i-handoff phakathi kweenkqubo ichaphazela zombini iindleko kunye nexesha lokukhokela.
