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| 1 | A review of friction stir joining of SiCp/Al composites显示文摘SiCp/Al composites have excellent comprehensive properties and have been widely used in aerospace,automotive industry and other fields.Due to the huge difference in performance between SiC particles and matrix alloys,traditional fusion welding methods are difficult to meet the join requirements of SiCp/Al composites.Friction stir joining(friction stir welding),as a solid phase joining process,has been proved to be a new technology with fine prospect in joining SiCp/Al composites compared with fusion welding process.Although some progress has been made in recent years,there are still full of challenges.In this paper,the research status of friction stir joining of SiCp/Al composites in recent years is expatiated,including the weldability of SiCp/Al composites,the macrostructure and the microstructure of joints,mechanical properties of joints,and tool wear and monitoring.Furthermore,the existing challenges of friction stir joining of SiCp/Al composites are summarized and the future development directions are prospected. | Lisheng ZUO Xianrui ZHAO Zeyang LI Dunwen ZUO Hongfeng WANG | 2020 | Chinese Journal of Aeronautics2020，33，3： | 6 |
| 2 | 冷却速率对高氮钢焊缝组织和性能的影响显示文摘研究了水冷和空冷条件下高氮不锈钢焊缝金属微观组织和力学性能的变化规律,讨论了冷却速率对高氮不锈钢焊缝微观组织和力学性能的影响规律.结果表明,冷却速率增加能够有效增加高氮钢焊缝金属中的氮含量,尤其对于含氮量0.85%的高氮含量焊丝,增氮效果更明显.冷却速率增加对高氮钢焊缝金属抗拉强度提高程度取决于焊丝中的氮含量,对于低氮含量高氮钢焊丝,冷却速率增加能够显著提高焊缝金属抗拉强度,当焊丝中氮含量超过0.58%时,冷却速率增加对焊缝金属抗拉强度影响不大,最终接头强度达到850 MPa. | 明珠 王克鸿 王伟 王有祁 | 2019 | 焊接学报2019，40，10： | 5 |
| 3 | 高氮钢连接技术研究进展显示文摘高氮钢具有高强度、高韧性、耐磨损和耐腐蚀等独特优势,相关连接件已广泛用于医疗仪器和采矿器械等领域.主要对近年来国内外有关高氮钢钨极气体保护焊、熔化极气体保护焊、激光焊与激光复合焊、搅拌摩擦焊和钎焊技术研究报道进行详细综述.根据熔焊、固焊、钎焊3大分类,从保护气体、热输入、工艺参数等方面系统评述现有各类高氮钢焊接方法与工艺调控,并介绍了医疗器械、石油钻铤、装甲防护领域国内高氮钢材料的应用现状,最后指出现有高氮钢连接体系研究中存在的不足及展望,期望对高氮钢焊接、高强材料功能性连接等相关领域研究和应用提供参考信息和理论依据. | 王星星 田家豪 李帅 方乃文 何鹏 倪增磊 温国栋 | 2023 | 焊接学报2023，44，9： | 0 |
| 4 | 异质不等厚高强钢点焊接头热影响区组织变化研究显示文摘对1.2mm和1.6mm厚B1500HS超高强钢板与1.0mm厚B250P1钢板进行了电阻点焊。研究了后热电流、后热时间和冷却时间等点焊工艺参数对点焊接头缺陷产生及热影响区粗晶区和临界区显微组织和硬度分布的影响。结果表明:点焊接头形成了单一的熔核,且存在缩孔和裂纹等缺陷;随着后热电流的增大以及后热时间和冷却时间的延长,热影响区粗晶区的马氏体发生粗化;随着后热电流的增大,临界区的回火马氏体发生粗化;随着后热时间和冷却时间的延长,临界区的回火马氏体增多;点焊接头母材的硬度比熔核区和热影响区的平均硬度高,热影响区发生了软化。 | 史博文 谢丽华 任江伟 | 2021 | 热处理2021，36，5： | 0 |
| 5 | Improvement of Microstructure and Mechanical Properties of Rapid Cooling Friction Stir-welded A1050 Pure Aluminum显示文摘Two-mm thick A1050 pure aluminum plates were successfully joined by conventional and rapid cooling friction stir welding(FSW), respectively. The microstructure and mechanical properties of the welded joints were investigated by electron backscatter diffraction characterization, Vickers hardness measurements, and tensile testing. The results showed that liquid CO_(2) coolant significantly reduced the peak temperature and increased the cooling rate, so the rapidly cooled FSW joint exhibited fine grains with a large number of dislocations. The grain refinement mechanism of the FSW A1050 pure aluminum joint was primarily attributed to the combined effects of continuous dynamic recrystallization, grain subdivision, and geometric dynamic recrystallization. Compared with conventional FSW, the yield strength, ultimate tensile strength, and fracture elongation of rapidly cooled FSW joint were significantly enhanced, and the welding efficiency was increased from 80% to 93%. The enhanced mechanical properties and improved synergy of strength and ductility were obtained due to the increased dislocation density and remarkable grain refinement. The wear of the tool can produce several WC particles retained in the joint, and the contribution of second phase strengthening to the enhanced strength should not be ignored. | 许楠 LIU Lutao SONG Qining ZHAO Jianhua BAO Yefeng | 2024 | Journal of Wuhan University of Technology(Materials Science)2024，39，1： | 0 |
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