本文選題：2219鋁合金 + X射線衍射�。� 參考：《哈爾濱工業(yè)大學》2017年碩士論文

【摘要】：2219鋁合金以其高強度及良好的斷裂韌性等優(yōu)點而被廣泛用于航天火箭燃料槽與氧化劑槽等方面,其焊接件的焊接殘余應力嚴重影響到焊接結構的使用性和結構安全可靠性。感應加熱技術在加熱時熱源集中、加熱效率高以及可實現(xiàn)局部熱處理等優(yōu)點,使其可以成為有效的大型焊接件殘余應力去除技術,但目前針對2219鋁合金焊接件感應加熱熱處理去應力的研究較少。本文通過有限元模擬和X射線衍射法開展對2219鋁合金不同焊接方法的殘余應力表征和感應加熱熱處理去應力技術的研究。針對X射線應力測量方法,研究了物理和化學兩種拋光預處理工藝以及粗糙度對表面應力測量結果的影響。測試結果表明,化學拋光方法與物理拋光方法相比,處理后的樣品表面形貌鋸齒狀尖端更少以及不產(chǎn)生附加的表面變形擾動層。同時樣品表面粗糙度對于X射線應力測量結果影響較大,實驗結果表明,粗糙度降低到一定范圍內(nèi)時,測量結果穩(wěn)定,接近真實值。采用MSC.Marc商業(yè)有限元模擬軟件開展對2219鋁合金鎢極氬弧熔焊和攪拌摩擦不同焊接方法的殘余應力有限元模擬,通過模擬和X射線法實測對比不同焊接方法下2219鋁合金焊后殘余應力場的大小和分布特征;通過二次開發(fā)子程序編譯,實現(xiàn)基于攪拌針熱源和熱機耦合模型下2219鋁合金攪拌摩擦焊殘余應力的模擬,同時研究一定范圍內(nèi),焊接速度和主軸轉數(shù)對該模型下焊接溫度和殘余應力的影響。結果表明,兩種不同焊接方法有限元模擬計算的焊縫區(qū)域尺寸與實測結果吻合,X射線應力測試結果與有限元模擬結果一致,證明了焊接熱源模型和力學計算的合理性,對比結果顯示攪拌摩擦焊可以實現(xiàn)較小殘余應力的焊接。通過感應加熱裝置,實現(xiàn)了對2219鋁合金焊接件焊縫區(qū)域的局部去應力熱處理,結果顯示,在時效溫度范圍內(nèi),隨著感應加熱溫度的提高,殘余應力峰值不斷降低,其中拉應力峰值降低明顯,熱處理溫度越高,應力分布越趨近于均勻化。通過MSC.MARC子程序編譯實現(xiàn)了感應加熱熱處理的計算,熱循環(huán)測試結果以及X射線應力測試結果與計算結果吻合,證明了簡化等密度感應加熱熱源有限元模擬的合理性。
[Abstract]:2219 aluminum alloy has been widely used in space rocket fuel tank and oxidant tank due to its high strength and good fracture toughness. The welding residual stress of the welded parts seriously affects the serviceability of the welded structure and the safety and reliability of the structure. Induction heating technology has the advantages of concentrated heat source, high heating efficiency and local heat treatment, which makes it an effective residual stress removal technology for large welded parts. However, there are few researches on induction heating and heat treatment of 2219 aluminum alloy welds. In this paper, finite element simulation and X-ray diffraction method are used to study the residual stress characterization of different welding methods of 2219 aluminum alloy and the technique of heat treatment of induction heating to remove stress. Aiming at the X-ray stress measurement method, the physical and chemical pretreatment processes and the effect of roughness on the surface stress measurement results are studied. The test results show that compared with physical polishing, the surface morphology of the treated samples has fewer zigzag tip and no additional surface deformation disturbance layer. At the same time, the surface roughness of the sample has a great influence on the X-ray stress measurement results. The experimental results show that when the roughness decreases to a certain range, the measured results are stable and close to the real value. MSC.Marc commercial finite element simulation software was used to simulate the residual stress of 2219 aluminum alloy welding by argon tungsten arc welding and friction stir welding. The size and distribution of residual stress field of 2219 aluminum alloy after welding were compared by simulation and X-ray method. The residual stress of 2219 aluminum alloy friction stir welding is simulated based on the coupling model of heat source and heat engine. The effects of welding speed and spindle rotation number on the welding temperature and residual stress in the model are also studied. The results show that the size of weld zone calculated by finite element simulation of two different welding methods is in agreement with the measured results. The results of X-ray stress measurement are in agreement with the results of finite element simulation, which proves the rationality of welding heat source model and mechanical calculation. The results show that friction stir welding can realize the welding of small residual stress. By means of induction heating device, the local stress-free heat treatment of weld area of 2219 aluminum alloy welds is realized. The results show that the peak value of residual stress decreases with the increase of induction heating temperature in the range of aging temperature. The peak value of tensile stress decreases obviously, and the higher the heat treatment temperature, the more homogeneous the stress distribution is. The calculation of induction heating heat treatment is realized by MSC.MARC subprogram. The results of thermal cycle test and X-ray stress test are in agreement with the calculated results, which proves the rationality of simplified finite element simulation of induction heating heat source with equal density.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG457.14

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