Cov nyhuv ntawm Titanium rau Qhov Zoo Ntawm Grey Hlau Castings

Nyob rau hauv cov xwm txheej ntawm siab carbon sib npaug (tshaj li 4.10 feem pua ​​CE) ntawm grey cam khwb cia hlau, ib qho me me ntawm titanium tuaj yeem txhim kho cov khoom siv ntawm cov hlau cam khwb cia thiab txhim kho qhov sib txawv ntawm cov ntu sib txawv ntawm cov cam khwb cia. Nyob rau hauv daim ntawv no, nyob rau hauv cov xwm txheej ntawm nruab nrab thiab qis carbon sib npaug (3.65 feem pua ​​~ 3.85 feem pua ​​CE), cuam tshuam ntawm cov ntsiab lus titanium sib txawv ntawm qhov zoo ntawm grey hlau castings, xws li microstructure, mechanical zog thiab compactness.

Cov txiaj ntsig kev sim qhia tias: titanium txhawb kev tsim ntawm D-hom graphite hauv hlau castings; thaum D-hom graphite nce mus txog ib qho kev faib ua feem, tshwj xeeb tshaj yog thaum Si / C siab, nws cov khoom siv tshuab nce ntau; Nrog rau qhov nce ntawm titanium thiab txhuas cov ntsiab lus, Lub compactness ntawm grey hlau castings txo, thiab qhov tshwm sim ntawm shrinkage porosity nce.

Nyob rau hauv cov txheej txheem ntawm kev tsim cov hlau castings, nrog rau kev siv ntau ntawm cov khoom siv rau cov hlau xws li npua hlau thiab cov hlau, titanium ntau dua los yog tsawg dua nkag mus rau hauv cov hlau molten. Ntau cov ntaub ntawv tshawb fawb qhia tau hais tias tom qab titanium ntxiv rau grey cam khwb cia hlau, feem ntau titanium tebchaw muaj nyob rau hauv cov hlau matrix, tab sis qee cov titanium nitrides los yog carbonitrides tseem muaj nyob rau hauv lub interface txheej ntawm ferrite thiab graphite. Titanium compounds nrog ib tug hardness ntawm 3200 HV los yog siab dua yuav txo tau lub machinability ntawm cam khwb cia hlau.

Tsis tas li ntawd, cov ntsiab lus titanium siab dhau (0.096 feem pua) ua rau kub tawg thaum txiav castings. Txawm li cas los xij, D-hom graphite hlau castings nrog titanium ntxiv tau zoo oxidation tsis kam, kev loj hlob tsis kam thiab thermal qaug zog. Raws li kev ua haujlwm ntawm 500-700 degree, piv nrog CrMoCu cam khwb cia hlau, lub neej kev pabcuam tuaj yeem nce ntxiv 3 zaug. Titanium yog nruj me ntsis txwv tsis pub ua ib qho kev cuam tshuam hauv cov hlau hlau.

Txawm li cas los xij, hauv qee qhov vermicular cam khwb cia hlau, titanium ntxiv rau tus neeg sawv cev vermicular raws li cov khoom muaj txiaj ntsig kom nthuav dav ntau yam kev kho kab mob. Nyob rau hauv cov xwm txheej ntawm siab carbon sib npaug, micro-titanium alloying tuaj yeem txhim kho lub zog thiab hardness ntawm grey hlau castings, thiab txhim kho cov ntoo khaub lig-sectional uniformity ntawm castings. Cov kab mob ntawm titanium kuj tseem tuaj yeem ua rau cov nitrogen ntau dhau hauv cov hlau cam kom txo tau qhov zaus ntawm qhov tawg zoo li nitrogen pores.