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首頁(yè)> 美國(guó)衛(wèi)生研究院文獻(xiàn)>Materials >Microstructure and Texture Variations in High Temperature Titanium Alloy Ti65 Sheets with Different Rolling Modes and Heat Treatments
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Microstructure and Texture Variations in High Temperature Titanium Alloy Ti65 Sheets with Different Rolling Modes and Heat Treatments

機(jī)譯：不同軋制方式和熱處理的高溫鈦合金Ti65板材的組織和織構(gòu)變化

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摘要

Ti65 alloy (Ti-5.8Al-4.0Sn-3.5Zr-0.5Mo-0.4Si-0.3Nb-1.0Ta-0.8W-0.05C) is the newly developed high temperature titanium alloy optimized from Ti60 alloys. The long-term service temperature of the alloy is as high as 650 °C, which is unattainable with the previous high temperature titanium alloy. It has excellent strength and excellent creep resistance, and has great application prospects in the aerospace industry. In the current study, the evolution of microstructure and texture of Ti65 alloy sheets developed by unidirectional rolling (UDR) and cross rolling (CR) followed by solution and aging treatment was investigated. The microstructure of the UDR sample consists of equiaxed , lamellar and few elongated , and the texture is the combination of minor B-type and major T-type texture, with the main component of basal {0001} fiber texture and , respectively. Due to more active slip system resulted by transformed direction, the microstructure of the CR sample consists of more elongated , and the <0001> texture characterized as R-type texture forms in addition to B/T-type texture. With aging temperature increasing, the microstructures for both transform to duplex microstructure, and the thicknesses of lamellar increase. B-type texture becomes stronger, while T/R-type texture are weakened, which is caused by the combination of recrystallization, spheroidization, and variant selection. An abnormal increasing of T/R-type texture but constant B-type texture happens in the CR-600 sample, which is related to high recrystallization fraction. It is expected that the research results can provide useful references for the rolling of high temperature titanium alloy sheets and the precise control of microstructure/texture.
機(jī)譯：Ti65合金（Ti-5.8Al-4.0Sn-3.5Zr-0.5Mo-0.4Si-0.3Nb-1.0Ta-0.8W-0.05C）是從Ti60合金優(yōu)化而來(lái)的最新開(kāi)發(fā)的高溫鈦合金。合金的長(zhǎng)期使用溫度高達(dá)650°C，這是以前的高溫鈦合金無(wú)法達(dá)到的。它具有優(yōu)異的強(qiáng)度和優(yōu)異的抗蠕變性，在航空航天工業(yè)中具有廣闊的應(yīng)用前景。在當(dāng)前的研究中，研究了通過(guò)單向軋制（UDR）和交叉軋制（CR）然后固溶和時(shí)效處理發(fā)展的Ti65合金薄板的組織和織構(gòu)演變。 UDR樣品的微觀結(jié)構(gòu)由等軸，層狀和少量拉長(zhǎng)組成，織構(gòu)是次要B型織構(gòu)和主要T型織構(gòu)的結(jié)合，主要成分是基礎(chǔ){0001}纖維織構(gòu)和。由于方向轉(zhuǎn)變導(dǎo)致滑動(dòng)系統(tǒng)更加活躍，因此CR樣品的微觀結(jié)構(gòu)由更多的拉長(zhǎng)組成，除B / T型織構(gòu)外，<0001>織構(gòu)為R型織構(gòu)。隨著時(shí)效溫度的升高，兩者的微觀結(jié)構(gòu)均轉(zhuǎn)變?yōu)殡p相微觀結(jié)構(gòu)，且層狀厚度增加。 B型織構(gòu)變強(qiáng)，而T / R型織構(gòu)變?nèi)?，這是由于重結(jié)晶，球化和變體選擇的組合所致。 CR / 600樣品中出現(xiàn)T / R型織構(gòu)異常增加而B(niǎo)型織構(gòu)不變的現(xiàn)象，這與高再結(jié)晶率有關(guān)。預(yù)期該研究結(jié)果可為高溫鈦合金薄板的軋制和組織/組織的精確控制提供有用的參考。

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