TA15鈦合金薄壁焊接件熱處理校形研究
發(fā)布人：上海艾荔艾金屬材料有限公司www.bt990.com.cn
更新時(shí)間：2015-12-18
針對(duì)飛機(jī)關(guān)鍵薄壁件焊接過(guò)程中產(chǎn)生的“簸箕”變形問(wèn)題，采用有限元結(jié)合實(shí)驗(yàn)驗(yàn)證的方法進(jìn)行了焊接變形及焊后熱處理校形的研究。通過(guò)實(shí)驗(yàn)獲得了材料的基礎(chǔ)物性及高溫蠕變行為，驗(yàn)證了焊接及焊后熱處理有限元模型。利用可靠的熱處理有限元模型進(jìn)行了熱處理工藝優(yōu)化。
TA15鈦合金薄壁焊接件熱處理校形研究STUDY ON SHAPE CORRECTION OF THE THIN PLATE OF?TA15 TITANIUM ALLOY BY POST WELD HEAT TREATMENT針對(duì)飛機(jī)關(guān)鍵薄壁件焊接過(guò)程中產(chǎn)生的“簸箕”變形問(wèn)題，采用有限元結(jié)合實(shí)驗(yàn)驗(yàn)證的方法進(jìn)行了焊接變形及焊后熱處理校形的研究。通過(guò)實(shí)驗(yàn)獲得了材料的基礎(chǔ)物性及高溫蠕變行為，驗(yàn)證了焊接及焊后熱處理有限元模型。利用可靠的熱處理有限元模型進(jìn)行了熱處理工藝優(yōu)化。結(jié)果表明，筋條焊后開(kāi)槽導(dǎo)致沿筋條方向的應(yīng)力釋放及筋條-長(zhǎng)衍焊點(diǎn)是導(dǎo)致“簸箕”變形的主要原因；提高溫度、增加載荷及延長(zhǎng)保溫時(shí)間能夠改善熱處理校形的效果，并據(jù)此制定了面向工程應(yīng)用的TA15 鈦合金薄壁構(gòu)件的熱處理工藝圖。?
Weld deformation of the thin-wall weldment used in fighter aircraft not only hinders?its subsequent procedure of fabrication and assembling, but also reduces its fatigue strength. As a?result, weld deformation shortens its service lifeessentially. Dustpan deformation is always?produced in the thin-wall weldment after multiple-pass weld. In this paper, combining with the?experiment, the finite element method was adopted to analysis the deformationof the thin-wall?weldment by multiple-pass weld and its shape correction by post weld heat treatment. For?obtaining the fundamental properties such as thermal parameters and mechanical parameters of?TA15 titanium alloy, a series of experiments were conducted at room temperature and high?temperatures. Additionally, creep behaviors of TA15 titanium alloy were studied at the?temperatures of 500℃, 550℃, 600℃, 650℃, 700℃ and 750℃, and the parameters of creep?constitutive equations of the alloy were obtained with considering the analysis of post weld heat?treatment. A thermal coupled temperature – displacement analysis for welding and post weld heat?treatment was performed on a three dimentional shell model of protective gille. Experiments of?multiple-pass weld and post weld heat treatment were used to testify the reliability of the finite?element model of welding and post weld heat treatment. With using the reliable finite element ?model, the parameters of heat treatment were studied. The study indicates that: the fabrication on?the crossing of structure section and fillet after fillet - wallboard weld leads the compression?deformation release along the fillet, after that, the shrinkage distortion produced during spot?welding of fillet - structural section mainly contributes the large dustpan deformation of the?thin-wall weldment; increasing temperatures, enlarging loads and prolonging the hold time can?improve the shape correction of the thin-wall weldment during post weld heat treatment, hence we?worked out the guide maps of the post weld heat treatment for shape correction of the thin-wall?weldment under 700℃ and 750℃.?
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