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Ti6321鈦合金退火處理過(guò)程中組織演變及其對(duì)沖擊韌性的影響
發(fā)布人：上海艾荔艾金屬材料有限公司bt990.com.cn
更新時(shí)間：2015-09-11
為了調(diào)整合金顯微組織參量，提高沖擊韌性，采用OM研究Ti6321合金退火處理過(guò)程中組織演變及其對(duì)沖擊韌性αkv的影響。
Ti6321鈦合金退火處理過(guò)程中組織演變及其對(duì)沖擊韌性的影響Microstructure evolution of Ti6321 titanium alloy during annealing treatment and its effect on impact toughness
為了調(diào)整合金顯微組織參量，提高沖擊韌性，采用OM研究Ti6321合金退火處理過(guò)程中組織演變及其對(duì)沖擊韌性αkv的影響。結(jié)果表明：Ti6321合金沖擊韌性隨退火溫度和時(shí)間發(fā)生明顯變化。當(dāng)退火溫度低于Tβ時(shí)，初生等軸α相晶粒尺寸和次生條狀α相寬度隨退火溫度升高而增大，次生α相條長(zhǎng)寬比減小，使Ti6321合金沖擊韌性αkv顯著提高。當(dāng)退火溫度高于Tβ時(shí)，退火后初生等軸α相減少，β相含量急劇增加，空冷時(shí)從β相中析出大量針狀次生α相，次生α相條長(zhǎng)寬比增大，使合金沖擊韌性αkv下降。在2 h內(nèi)隨退火時(shí)間延長(zhǎng)，次生α相條粗化，長(zhǎng)寬比降低，沖擊韌性上升；退火時(shí)間超過(guò)2 h后，合金組織和沖擊韌性趨于穩(wěn)定。
The microstructure evolution and its effects on impact toughness of Ti6321 titanium alloy were investigated by the OM in order to enhance the impact toughness by changing microstructure through adjusting annealing temperature. The results indicate that the impact toughness greatly changes with the increase of annealing temperature. When the annealing temperature is lower than tβ, exquiaxed primary α grain and the secondary α lath grow up with annealing temperature increasing, and the impact toughness is remarkably enhanced. However, when annealing temperature is higher than tβ, exquiaxed primary α phase is reduced, and β phase contents rapidly increase. Large numbers of needle-like secondary α phases precipitate from β phase during air cooling, and the ratio of length to width of secondary α lath increases, which makes the impact toughness decrease. Within 2 h, secondary α lath coarsen and the ratio of length to width decreases with increase of annealing time, and then impact toughness increases. When annealing time is longer than 2 h, the microstructure and impact toughness are unchanged with annealing time prolonging.
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