Ua ntej nkag siab txog cov txheej txheem forging, nws yuav tsum xub nkag siab txog cov khoom tshwj xeeb ntawm titanium alloys, uas txiav txim siab qhov nyuaj thiab qhov tshwj xeeb ntawm lawv cov forging.
1.High tshwj xeeb lub zog (lub zog / qhov sib piv): Lub zog ntawm titanium alloys yog ze rau ntawm cov hlau, tab sis lawv qhov ceev tsuas yog 60% ntawm cov hlau, uas yog lawv qhov tseem ceeb tshaj plaws.
2. Zoo siab -kub kev ua haujlwm: Nws tseem tuaj yeem tuav lub zog siab ntawm 400-550℃C, thaum lub zog ntawm aluminium alloy yuav txo qis tshaj 200 degree.
3. Strong corrosion resistance: The surface is prone to forming a dense and stable oxide film, which has excellent corrosion resistance to the atmosphere, seawater, and various chemical media.
4. Muaj tshuaj lom neeg ua haujlwm siab: Qhov no yog qhov nyuaj ntawm forging. Thaum qhov kub thiab txias (tshwj xeeb tshaj yog siab dua 800 ° C), titanium reacts nrog oxygen, nitrogen, thiab hydrogen hauv huab cua.
Kev nqus pa: Kev tsim cov tawv nqaij tawv thiab tawv oxide (Case) ntawm qhov chaw tuaj yeem txo qhov qaug zog thiab tawv ntawm qhov chaw.
Hydrogen absorption: tej zaum yuav ua rau hydrogen embrittlement, ua rau txo qis hauv cov khoom yas.
5. Cov thermal conductivity tsis zoo: Lub thermal conductivity ntawm titanium yog li ntawm 1/5 ntawm cov hlau thiab 1/15 ntawm txhuas. Qhov no ua rau qhov sib txawv ntawm qhov kub thiab txias ntawm sab hauv thiab sab nraud ntawm lub billet thaum lub sij hawm forging cua sov, uas yooj yim generates thermal stress; Thaum lub sij hawm forging deformation, tshav kub tsis yooj yim dissipated, ua rau hauv zos overheating uas yuav mloog zoo nyob rau hauv lub deformation cheeb tsam thiab tshaj qhov tso cai forging kub.
6. High deformation kuj thiab nqaim plasticity ntau yam: Titanium alloys muaj lub zog siab ntawm chav tsev kub thiab nyuaj rau deform. Nws forging yuav tsum tau nqa tawm nyob rau hauv ib tug tshwj xeeb kub ntau yam. Yog tias qhov kub thiab txias dhau lawm, nws yuav ua rau cov nplej ntxhib ( brittleness) lossis overburning. Yog tias qhov kub thiab txias qis dhau lawm, nws yuav ua rau muaj kev cuam tshuam ntawm deformation thiab tuaj yeem tawg.
Lub forging ntawm titanium alloys feem ntau ua raws li cov kauj ruam tseem ceeb hauv qab no:
1. Cov khoom txiav
Feem ntau, cov hlua saw lossis tshuab dhos yog siv los txiav kom ntseeg tau tias lub ntsej muag kawg yog tiaj tus, tsis muaj burrs thiab tawg, txhawm rau tiv thaiv kev tawg tawm thaum lub sijhawm cua sov thiab forging.
2. Cua sov
Qhov no yog txoj kev npaj tseem ceeb tshaj plaws.
Kev ntsuas kub: nruj me ntsis raws li qib alloy. Feem ntau, nws yog forged ntawm 20-50 ° C hauv qab ntawm theem hloov pauv (T) (hauv cheeb tsam +) lossis siab dua T (hauv cheeb tsam). Lub forging kub ntau rau feem ntau siv alloys xws li TC4 (Ti-6Al-4V) yog kwv yees li 900-950℃C.
3. Cov khoom siv cua sov: yuav tsum tau siv lub tshuab hluav taws xob los yog cov roj hluav taws xob tiv thaiv hluav taws xob. Ua ntej pom zoo kom tswj cov cua sov cua sov lossis lub tshuab nqus tsev vacuum kom txo cov pa phem. Yog tias siv lub qhov cub ua haujlwm tsis tu ncua, ib qho chaw oxidizing me ntsis yuav tsum tau khaws cia hauv lub qhov cub kom tsis txhob muaj cua sov (kom tiv thaiv hydrogenation).
4.Lub sij hawm cua sov: txiav txim siab raws li qhov loj ntawm lub billet, kom ntseeg tau tias qhov kub thiab txias sab hauv thiab sab nraum lub billet. Vim tsis zoo thermal conductivity, lub sij hawm cua sov feem ntau ntev dua li cov hlau.
