Study on Effect of Electromagnetic Pulse Treatment on Fatigue Life of Electron Beam Welded Joints of GH3535 Superalloy
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摘要: GH3535合金是熔盐堆重要的结构材料,其焊接接头的不均匀性会影响熔盐堆核能系统整体的疲劳寿命。为了修复服役过程中焊接接头的疲劳损伤,提升熔盐堆服役过程的安全性,本研究使用电磁脉冲技术对已进行疲劳损伤试验的GH3535合金电子束焊接接头进行处理,探究电磁脉冲处理对焊接接头疲劳寿命的影响,并研究了内部微观组织结构经电磁脉冲处理后的变化规律。结果表明,经电磁脉冲处理后,焊接接头的疲劳损伤状态得以改善,不同应力水平下的疲劳寿命均显著提升。这是因为电磁脉冲处理促进了焊接接头内部的位错发生增殖、滑移,位错密度增大,从而形成了位错墙等复杂结构,阻碍了疲劳裂纹的扩展。同时,电磁脉冲处理使得焊接接头内部二次裂纹缺陷的萌生与扩展受到阻碍,改善了其内部的疲劳损伤状态,有助于延长其疲劳寿命。Abstract: GH3535 superalloy is an important structural material for molten salt reactors, and the heterogeneity of its welded joint can affect the overall fatigue life of nuclear energy system of molten salt reactor. In order to repair the fatigue damage of the welded joint and enhance the safety molten salt reactor in the cause of service, we treat the electron beam welded joint of GH3535 superalloy, which has been subjected to fatigue damage tests, using electromagnetic pulse technology, to investigate changes of the microstructure of the welded joint and the influence of electromagnetic pulse treatment on the fatigue life of the welded joint. Results indicate that the fatigue damage state of the welded joint is improved, and that the fatigue life under various stress levels significantly prolonged. The electromagnetic pulse treatment promote the multiplication and slip of dislocations within the welded joint, increasing the dislocation density and forming complex structures such as dislocation wall, which can hinder the propagation of fatigue cracks. Meanwhile, the electromagnetic pulse treatment impede the initiation and propagation of secondary cracks within the joints, improve the internal fatigue damage state of the welded joint, and contribute to the extension of the fatigue life of the welded joint.
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[1] 荣健, 刘展. 先进核能技术发展与展望[J]. 原子能科学技术, 2020, 54(9): 1638-1643. [2] LEI Z, CHEN X W, DAI Y, et al. Design and analysis of a heat pipe molten salt reactor tower thermal power generation system[J]. Nuclear techniques. 2023, 46(7): 070601.
[3] WULANDARI R, PERMANA S. Comparatives stu-dies of a safety analysis for molten salt reactor (MSR)[J]. Journal of Physics: Conference Series, 2020, 1493(1): 012030.
[4] WANG J M, JIA Y Y, HAN F F, et al. Effect of Al addition on intergranular embrittlement behavior of GH3535 alloy induced by fission product Te[J]. Co-rrosion Science, 2022, 207: 110576.
[5] 杨杜, 白琴, 胡悦, 等. GH3535合金中晶界特征对碲致脆性开裂影响的分形分析[J]. 金属学报, 2023, 59(2): 248-256. [6] LIU C P, YE X X, LI X L, et al. The effect of niobium element on the tensile behavior in GH3535 alloy at room temperature and 750℃[J]. Materials Science and Engineering: A, 2022, 861: 144401.
[7] XU X Y, XIE L Y, ZHOU S, et al. Effect of welding defects on fatigue properties of SWA490BW steel cruciform welded joints[J]. Materials, 2023, 16(13): 4751.
[8] 范清海. 焊接缺陷对铝合金焊接接头疲劳性能影响[J]. 黑龙江科技信息, 2016(23): 58. [9] 孙朋飞, 姚丹丹, 张鹏林, 等. 金属焊接接头疲劳寿命延长技术综述[J]. 材料导报, 2021, 35(9): 9059-9068. [10] KIM D Y, KIM D, KANG M, et al. Improvement of fatigue strength of lap fillet joints by using tandem MAG welding in a 590-MPa-grade galvannealed steel sheet[J]. The International Journal of Advanced Ma-nufacturing Technology, 2017, 93(9): 4379-4387.
[11] 熊奇, 周丽君, 杨猛, 等. 单脉冲电磁成形中洛伦兹力在时间上的双向竞争关系及其对成形效果的影响[J]. 电工技术学报, 2022, 37(14): 3453-3463. [12] 金延野, 于海平. 板材电磁成形技术研究进展[J]. 精密成形工程, 2021, 13(5): 1-9. [13] 李奋强, 陈新宇, 蒋继帅. 电磁成形技术在钛合金板材成形中的应用[J]. 精密成形工程, 2021, 13(5): 43-50. [14] LIM M, BYUN H, SONG Y J, et al. Numerical investigation on comparison of electromagnetic forming and drawing for electromagnetic forming characterization[J]. Metals, 2022, 12(8): 1248.
[15] WANG Z J, SONG H. Effect of high-density electropulsing on microstructure and mechanical properties of cold-rolled TA15 titanium alloy sheet[J]. Journal of Alloys and Compounds, 2009, 470(1-2): 522-530.
[16] SHAO Q, WANG G, WANG H D, et al. Improve-ment in uniformity of alloy steel by pulsed magnetic field treatment[J]. Materials Science and Engineering: A, 2021, 799: 140143.
[17] 王潇桐, 赵桐, 王渊, 等. 电磁耦合处理对Ti2AlNb合金电子束焊缝疲劳寿命的影响[J]. 稀有金属材料与工程, 2023, 52(5): 1683-1694. [18] 蔡志鹏, 林健. 磁处理过程中磁致伸缩与残余应力关系的研究[J]. 机械工程学报, 2010, 46(22): 36-40. [19] 罗丞, 李正龙, 曹洪志, 等. 脉冲磁场处理对SKD11模具钢残余拉应力的影响机理分析[J]. 中国机械工程, 2016, 27(11): 1535-1540. [20] YU K, JIANG Z G, LI C W, et al. Microstructure and mechanical properties of fiber laser welded GH3535 superalloy[J]. Journal of Materials Science & Technology, 2017, 33(11): 1289-1299.
[21] CHEN S J, YE X X, YU K, et al. Microstructure and mechanical properties of UNS N10003 alloy welded joints[J]. Materials Science and Engineering: A, 2017, 682: 168-177.
[22] NI S, WANG Y B, LIAO X Z, et al. The effect of dislocation density on the interactions between dislocations and twin boundaries in nanocrystalline materials[J]. Acta Materialia, 2012, 60(6-7): 3181-3189.
[23] SCHOUWENAARS R, SEEFELDT M, VAN H P. The stress field of an array of parallel dislocation pile-ups: implications for grain boundary hardening and excess dislocation distributions[J]. Acta Materialia, 2010, 58(13): 4344-4353.
[24] 李桂荣, 李月明, 王芳芳, 等. 脉冲强磁场处理对TC4钛合金显微组织及力学性能的影响[J]. 中国有色金属学报, 2015, 25(2): 330-337. [25] GOLOVIN Y I. Magnetoplastic effects in solids[J]. Physics of the Solid State, 2004, 46(5): 789-824.
[26] 李桂荣, 王宏明, 李沛思, 等. 磁致塑性效应下的位错动力学机制[J]. 物理学报, 2015, 64(14): 341-350. [27] 施可琢, 帅三三, 雷力明, 等. 在磁场中加热对单晶铝力学性能和位错密度的影响[J]. 上海金属, 2022, 44(1): 56-61. [28] 曹凤雷, 谭振, 汪殿龙, 等. 电脉冲法消除金属材料残余应力研究进展[J]. 焊接, 2024(9): 1-6. [29] 张鹤雄. Al-Zn-Mg合金塑性成形中电子风力和焦耳热耦合下的位错行为[D]. 北京: 北京科技大学, 2021. [30] PAN L, WANG B S, XU Z Q. Effects of electropul-sing treatment on residual stresses of high elastic cobalt-base alloy ISO 5832-7[J]. Journal of Alloys and Compounds, 2019, 792: 994-999.
[31] 张孟非. 脉冲电流辅助钛合金塑性变形行为及电致塑性机理研究[D]. 太原: 太原理工大学, 2023.
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