Unyango loBushushu lwe-Martensitic Stainless Steel Castings

I-Martensitic steel stainless ibhekisa kuhlobo lwentsimbi engatyiwayo olune-microstructure yayo ikakhulu i-martensite. Umxholo we-chromium we-martensitic steel stainless ikuluhlu lwe-12% - 18%, kwaye izakhi zayo eziphambili ze-alloying ziyintsimbi, i-chromium, i-nickel kunye nekhabhoni.

I-Martensitic steel stainless inokulungelelanisa iimpawu zayo zoomatshini ngonyango lobushushu kwaye luhlobo lwentsimbi engenasici. Intsimbi ye-martensitic engenatyiwa inokwahlulwa ibe yintsimbi ye-martensitic chromium kunye nentsimbi ye-martensitic chromium-nickel ngokweendlela ezahlukeneyo zeekhemikhali.

 

Imibono eKhawulezayo ye-Martensitic Stainless Steel
Udidi	Yenziwe ngentsimbi eshayinayo
Ingcaciso	Uhlobo lwensimbi engenasici elukhuni enesakhiwo seMartensitic
Unyango lobushushu	Ukuhlambalaza, ukunyamezela, ukunyamezela
Izinto zengxubevange	Cr, Ni, C, Mo, V
Ukuweldability	Ubuhlwempu
Imagnethi	Phakathi
Ulwakhiwo oluncinci	Ikakhulu iMartensitic
Amabanga aqhelekileyo	Cr13, 2Cr13, 3Cr13
Usetyenziso	I-Steam turbine blade, i-Tableware, izixhobo zoTyando, iAerospace, amashishini aseLwandle

 

I-Martensitic steel stainless ibhekisa kuhlobo lwentsimbi engatyiwayo olune-microstructure yayo ikakhulu i-martensite. Umxholo we-chromium we-martensitic steel stainless ikuluhlu lwe-12% - 18%, kwaye izakhi zayo eziphambili ze-alloying ziyintsimbi, i-chromium, i-nickel kunye nekhabhoni.

I-Martensitic steel stainless inokulungelelanisa iimpawu zayo zoomatshini ngonyango lobushushu kwaye luhlobo lwentsimbi engenasici. Intsimbi ye-martensitic engenatyiwa inokwahlulwa ibe yintsimbi ye-martensitic chromium kunye nentsimbi ye-martensitic chromium-nickel ngokweendlela ezahlukeneyo zeekhemikhali.

1. Intsimbi yeChromium yeMartensitic
Ukongeza kwi-chromium, intsimbi ye-martensitic chromium nayo iqulethe inani elithile lekhabhoni. Umxholo wechromium umisela ukuxhathisa ukubola kwentsimbi. Ukuphakama komxholo wekhabhoni, amandla aphezulu, ukuqina kunye nokumelana nokunxiba. Isakhiwo esiqhelekileyo solu hlobo lwensimbi yi-martensite, kwaye ezinye ziqulethe ixabiso elincinci le-austenite, i-ferrite okanye i-pearlite. Isetyenziselwa ikakhulu ukwenza iinxalenye, amacandelo, izixhobo, iimela, njl.njl ezifuna amandla aphezulu kunye nokuqina, kodwa azifuni ukuxhathisa okuphezulu. Amabakala entsimbi aqhelekileyo yi-2Crl3, 4Crl3, 9Crl8, njl.

2. Intsimbi ye-Martensitic Chromium-Nickel
Intsimbi ye-chromium-nickel ye-Martensitic ibandakanya imvula ye-martensitic eyenza lukhuni intsimbi engatyiwayo, imvula ephakathi kwe-austenitic eyenza lukhuni intsimbi engatyiwayo kunye nentsimbi emdaka emdaka, njl.njl., zonke ezomelele okanye ezomelele kakhulu. Olu hlobo lwensimbi lunomxholo ophantsi wekhabhoni (ngaphantsi kwe-0.10%) kwaye luqukethe i-nickel. Amanye amabakala aqulethe izinto eziphezulu ezifana ne-molybdenum kunye nobhedu. Ke ngoko, olu hlobo lwentsimbi lunamandla amakhulu, ngelixa ludibanisa amandla kunye nokuqina kunye nokumelana nokubola. Ukusebenza, ukuwelda, njl. kungcono kune-martensitic chromium steel. I-Crl7Ni2 yeyona isetyenziswa ngokuqhelekileyo i-low-nickel martensitic steel stainless steel.

Martensiteimvula iqina ingenabalaintsimbi ngokuqhelekileyo ikwaqulathe Al, Ti, Cu kunye nezinye izinto. Igqithisa i-Ni3A1, i-Ni3Ti kunye nezinye izigaba zokomelezwa kwe-dispersion kwi-matrix ye-martensite ngokusebenzisa ukuqina kwemvula ukuze kuphuculwe ngakumbi amandla entsimbi. Semi-austenite (okanye semi-martensitic) imvula ukuqina intsimbi stainless, ngenxa yokuba imeko yacinywa kusekho austenite, ngoko ke imeko yacinywa usenako ukubanda wasebenza kwaye ngokomelezwa unyango oluphakathi, unyango ukwaluphala kunye nezinye iinkqubo. Ngale ndlela, i-austenite kwi-martensitic precipitation iqinisa insimbi engenasici inokuguqulwa ngokuthe ngqo ibe yi-martensite emva kokucima, nto leyo ekhokelela kukungabikho kobunzima ekuqhubeni nasekuqulunqeni okulandelayo. Amanqanaba entsimbi asetyenziswa ngokuqhelekileyo yi-0Crl7Ni7AI, 0Crl5Ni7M02A1 njalo njalo. Olu hlobo lwentsimbi lunamandla amakhulu, ngokubanzi lufikelela kwi-1200-1400 MPa, kwaye luhlala lusetyenziselwa ukwenza iinxalenye zesakhiwo ezingadingi ukuxhathisa okuphezulu kwe-corrosion kodwa zifuna amandla aphezulu.

Unyango oluqhelekileyo olusetyenziswayo lobushushu lwentsimbi ye-martensitic lucima kunye nonyango olushushu. Ngokuqhelekileyo khetha ukupholisa kwioli okanye emoyeni kwiqondo lobushushu le-950-1050 ℃. Emva koko ubushushu kwi-650-750 ° C. Ngokuqhelekileyo, kufuneka ihlanjululwe ngokukhawuleza emva kokucima ukuze kuthintelwe ukuphosa ekuqhekekeni ngenxa yoxinzelelo lwesakhiwo esicinyiweyo.

I-high-high-high-carbon martensitic stainless steel castings equkethe inani elincinci le-nickel, i-molybdenum, i-silicon kunye nezinye izinto ezixutywayo zineempawu ezilungileyo ezibanzi zoomatshini, iipropati ze-welding kunye nokumelana nokunxiba emva kokuqhelekileyo kunye nokufudumala. Ukuphoswa okunjalo kusetyenziswa ngokubanzi ekujuleni okudityanisiweyo kunye nokuphosa + izishukumisi ze-welding yeeinjini ezinkulu zehydraulic. Kule meko, inkcazo yonyango lobushushu ngokuqhelekileyo ekhethiweyo iqhelekile kwi-950 - 1050 ℃ kunye nokufudumala kwi-600 -670 ℃.