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單級退火對BTi-6431S合金組織和力學性能的影響
發(fā)布人：上海艾荔艾金屬材料有限公司bt990.com.cn
更新時間：2015-08-19
采用光學顯微鏡、電子探針和拉伸實驗研究單重退火處理對BTi-6431S合金顯微組織和力學性能的影響。
單級退火對BTi-6431S合金組織和力學性能的影響Effect of single annealing on microstructure and mechanical
properties of BTi-6431S titanium alloy
采用光學顯微鏡、電子探針和拉伸實驗研究單重退火處理對BTi-6431S合金顯微組織和力學性能的影響。結果表明：隨退火溫度的升高，合金中的初生α相粗化，趨于等軸狀，體積分數(shù)逐漸降低；β相和次生α相的體積分數(shù)增加。隨退火溫度的升高，合金的室溫強度先升高后降低，高溫強度則逐漸升高；但是室溫和高溫塑性均不斷下降。經(jīng)過980
℃退火處理后，BTi-6431S合金獲得良好的高溫強度和室溫塑性匹配，此時合金650 ℃的抗拉強度達到600 MPa以上，室溫伸長率超過8%。
The effects of single annealing on the microstructure and
mechanical properties of BTi-6431S titanium alloy were studied by OM, EPMA and
tensile test. The results show that, with increasing annealing temperature, the
primary α phase becomes coarse, then changes into equiaxed shape, and its volume
fraction decreases gradually, while the volume fractions of β phase and
secondary α phase increase. With elevating the annealing temperature, the room
temperature strength increases at first and then decreases, while the high
temperature strength increases gradually, but the room-temperature and
high-temperature ductility decreases. After annealing at 980 ℃, BTi-6431S alloy
acquires good strength at high-temperature and plasticity at room-temperature.
The ultimate tensile strength at 650 ℃ can reach more than 600 MPa, and the
room-temperature elongation is more than 8%.
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