顯微組織對近α型TG6鈦合金高溫蠕變變形行為的影響
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：2015-12-27
研究TG6鈦合金在3種顯微組織條件下的600 ℃蠕變變形行為，在600 ℃，200 MPa的測試條件下，粗晶的網(wǎng)籃組織具有最強(qiáng)的蠕變抗力，而細(xì)晶的等軸組織具有最弱的蠕變抗力，雙態(tài)組織介于中間。
顯微組織對近α型TG6鈦合金高溫蠕變變形行為的影響Effect of microstructure on creep deformation behavior of near-alpha titanium alloy TG6研究TG6鈦合金在3種顯微組織條件下的600 ℃蠕變變形行為，在600 ℃，200 MPa的測試條件下，粗晶的網(wǎng)籃組織具有最強(qiáng)的蠕變抗力，而細(xì)晶的等軸組織具有最弱的蠕變抗力，雙態(tài)組織介于中間。經(jīng)過600 ℃長期熱暴露后，TG6鈦合金網(wǎng)籃組織的蠕變抗力有所下降，而雙態(tài)組織和等軸組織的蠕變抗力反而得以提高，這歸因于α2相和硅化物沉淀析出對蠕變抗力的作用，均勻析出的α2相可以提高合金的蠕變抗力，而硅化物的析出會使得α基體貧Si，減弱了Si原子氣團(tuán)對位錯(cuò)攀移的阻礙作用，從而導(dǎo)致蠕變抗力的下降。TG6鈦合金在600 ℃，200 MPa下的穩(wěn)態(tài)蠕變變形主要受位錯(cuò)攀移機(jī)制的控制。
The creep behaviors of three microstructures of TG6 titanium alloy disc forgings at 600 ℃ were studied. Under the condition of 600 ℃ and 200 MPa, the coarse-grain basketweave structure has the highest creep resistance, fine-grain equiaxed structure has the lowest creep resistance, and the duplex structure has a moderate creep resistance. After a long thermal exposure at 600 ℃, the creep resistance of basketweave structure reduces. On the contrary, the creep resistances of duplex and equiaxed structures improve, which may be due to the different roles of α2?phase and silicide precipitation on the creep resistance. The homogeneous precipitated α2?phase may improve the resistance, while the silicide precipitation may result in reduction of creep resistance due to the depletion of Si in α matrix. The steady state creep deformation of TG6 titanium under 600 ℃ and 200 MPa is mainly controlled by dislocation climbing.
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