Txheej txheem cej luam Ntawm Cast Titanium Alloys

Ntshiab titanium yog grey-dawb lub teeb hlau, me me ntom, 4.54 xuab zeb m3, nruab nrab ntawm Al thiab Fe, siab melting point, txog 1668 degree, siab tshaj hlau, me me coefficient ntawm thermal expansion, tsis zoo thermal conductivity.

Ntshiab titanium plasticity, tsis tshua muaj zog, yooj yim rau txheej txheem molding, tuaj yeem ua rau cov hlau zoo thiab daim ntawv. Titanium alloy lub zog yog siab heev, 0h mus txog 1400MPa, zoo ib yam li ib co high-strength alloy steel, tab sis kuj muaj zoo kub-kub txhua yam khoom.Ti muaj zoo heev corrosion kuj nyob rau hauv cov huab cua thiab seawater, nyob rau hauv sulfuric acid. , hydrochloric acid, nitric acid, sodium nitrogen oxide, thiab lwm yam kev tshaj tawm yog ruaj khov heev, Ti's oxidation kuj zoo dua li feem ntau austenitic stainless hlau.

Ti hauv lub xeev cov khoom muaj kev hloov pauv isotropic: 882.5 degree rau cov kab ntom ntom ntawm hexagonal lattice, hais tias a-Ti; 882.5 degree kom txog rau thaum lub melting point rau lub cev-centered cubic lattice, hais tias, -Ti; 882.5 degree isotropic hloov pauv a-Ti ← → -Ti, uas muaj qhov tseem ceeb heev rau kev txhawb nqa.

Muaj cov ntshiab titanium muaj H, C, 0, Fe, Mg thiab lwm yam impurity, me me ntawm impurities tuaj yeem ua rau titanium lub zog thiab hardness ho ntau dua, plasticity thiab toughness qis dua. Muaj cov ntshiab titanium raws li cov ntsiab lus sib txawv ntawm impurities muab faib ua TA 1. TA 2. TA3 thiab lwm yam peb hom raws li 15-1), qhov loj ntawm cov impurities, tuaj yeem ua rau hauv 350 degree hauv qab ntawm kev ua haujlwm, lub zog xav tau ntawm cov khoom tsis siab.

Alloying ntsiab dissolved nyob rau hauv a-Ti, tsim ib qho kev daws teeb meem, yaj nyob rau hauv lub riam-Ti los ua ib tug khoom tov. Al, C, NO "B, thiab lwm yam los ua kom qhov kev hloov pauv ntawm a-Ti-Moon-Ti nce, lub npe hu ua stabilizing cov ntsiab lus Fe, Mo, Mg, Cr, Mn, V, thiab lwm yam. kub txo, hu ua cov stabilizing cov ntsiab lus, Sn . Zr, thiab lwm yam. tsis muaj kev cuam tshuam tseem ceeb ntawm kev hloov pauv kub thiab hu ua cov ntsiab lus nruab nrab.

Raws li kev siv lub xeev annealed ntawm lub koom haum theem, titanium alloys tuaj yeem muab faib ua peb pawg: titanium alloy, 18 titanium alloy thiab ((a +) titanium alloy. Cov qib qhia tau hais tias TA, TB, TC ntxiv rau tus lej. . Titanium alloy qib thiab siv nyob rau hauv Table 15-1, titanium alloy Titanium stabilizing ntsiab xws li ntxiv Al. B kom tau ib tug titanium alloy.a titanium alloy lub zog ntawm chav tsev kub yog qis dua cov titanium alloy thiab (a + ) titanium alloy, tab sis qhov kub thiab txias ({4}} degree) lub zog yog siab dua lawv thiab lub koom haum ntawm kev ruaj ntseg, oxidation kuj thiab creep kuj yog qhov zoo, zoo vuam kev ua tau zoo. tso siab rau cov khoom siv dag zog, kev kho cua sov tsuas yog annealed tom qab cov duab ntawm cov kev ntxhov siab nyem annealing los yog tshem tawm ntawm kev ua hauj lwm hardening recrystallization annealing.

Ib qib zoo ntawm titanium alloy yog TA7, muaj pes tsawg leeg Ti-5A1-2.5 Sn. Nws siv kub tsis tshaj 5000C, feem ntau yog siv nyob rau hauv lub tsim ntawm missile roj tso tsheb hlau luam, supersonic aircraft turbine magazines.