纳米SiC对2024铝合金搅拌摩擦焊的影响研究
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摘要
进行了未添加SiC和添加纳米SiC颗粒后1道次和4道次的搅拌摩擦焊接试验。试验结果表明,添加与未添加纳米SiC增强相进行搅拌摩擦焊均能够得到无缺陷的焊缝,且添加纳米SiC的焊核区的硬度得到了提高。1道次焊接后,纳米SiC出现了明显的团聚现象,焊核区的显微硬度值波动较大,多道次的焊接可以使得SiC颗粒分布均匀,焊核区的显微硬度值更加稳定。由于多道次的焊接使热输入增加,导致无SiC颗粒增强相分布的TMAZ和HAZ的硬度值明显下降。添加纳米SiC增强相并进行多道次搅拌摩擦焊可以作为提高焊核区性能的方法。
One-pass and four-pass friction stir welding experiments with and without SiC were carried out. The experiment results show that defect free weld can be obtained by friction stir welding with and without SiC, and when the nano SiC is added, the hardness of the weld nugget is improved. There is a clear agglomeration phenomenon of nano SiC in the weld by one pass welding, and the micro-hardness value of the weld nugget fluctuates greatly. Through multiple pass welding, the SiC particles can be uniformly distributed, and the microhardness value of the weld nugget is more stable. The hardness values of TMAZ and HAZ without SiC particle reinforced phase decrease obviously due to the increase of heat input caused by multi-pass welding. The addition of nano SiC reinforced phase and multi-pass friction stir welding can be used as the method to improve the performance of the nugget zone.
One-pass and four-pass friction stir welding experiments with and without SiC were carried out. The experiment results show that defect free weld can be obtained by friction stir welding with and without SiC, and when the nano SiC is added, the hardness of the weld nugget is improved. There is a clear agglomeration phenomenon of nano SiC in the weld by one pass welding, and the micro-hardness value of the weld nugget fluctuates greatly. Through multiple pass welding, the SiC particles can be uniformly distributed, and the microhardness value of the weld nugget is more stable. The hardness values of TMAZ and HAZ without SiC particle reinforced phase decrease obviously due to the increase of heat input caused by multi-pass welding. The addition of nano SiC reinforced phase and multi-pass friction stir welding can be used as the method to improve the performance of the nugget zone.
引文
[1]潘复生,张丁非.铝合金及应用[M].北京:化学工业出版社,2006.
[2]Mishra R S,Ma Z Y.Friction stir welding and processing[J].Materials Science and Engineering R,2005,50(1/2):1-78.
[3]薛鹏,张星星,吴利辉,等.搅拌摩擦焊接与加工研究进展[J].金属学报,2016,52(10):1222-1238.
[4]王希靖,马晓飞,张金银等.搅拌头形状对2024铝合金FSW接头力学性能的影响[J].热加工工艺,2017,46(11):47-50.
[5]张成聪,常保华,陶军等.2024铝合金搅拌摩擦焊过程组织演化分析[J].焊接学报,2013,34(3):57-59.
[6]王希靖,达朝炳,李晶,等.搅拌摩擦焊缝中的洋葱环形成分析[J].中国有色金属学报,2006,16(10):1672-1677.
[7]达朝炳.搅拌摩擦焊接头缺陷分析[J].热加工工艺,2009,38(5):133-137.
[8]Bahrami M,Givi M K B,Dehghani K,et al.On the role of pin geometry in microstructure and mechanical properties of AA7075/SiC nano-composite fabricated by friction stir welding technique[J].Materials&Design,2014,53:519-527.
[9]Bahrami M,Nikoo M F,Givi M K B.Microstructural and mechanical behaviors of nona-SiC-reinforced AA7075-O FSWjoints prepared through two passes[J].Materials Sicense and Engeering A,2015,626:220-228.
[10]Jamalian H M,Ramezani H,Ghobadi H,et al.Processingstructure-property correlation in nano-SiC-reinforced friction stir welded aluminum joints[J].Journal of Manufacturing Processes,2016,21:180-189.
[11]Khorrami M S,Kazeminezhad M,Kokabi A H.Thermal stability of aluminum after friction stir processing with SiC nanoparticles[J].Materials&Design,2015,80:41-50.
[2]Mishra R S,Ma Z Y.Friction stir welding and processing[J].Materials Science and Engineering R,2005,50(1/2):1-78.
[3]薛鹏,张星星,吴利辉,等.搅拌摩擦焊接与加工研究进展[J].金属学报,2016,52(10):1222-1238.
[4]王希靖,马晓飞,张金银等.搅拌头形状对2024铝合金FSW接头力学性能的影响[J].热加工工艺,2017,46(11):47-50.
[5]张成聪,常保华,陶军等.2024铝合金搅拌摩擦焊过程组织演化分析[J].焊接学报,2013,34(3):57-59.
[6]王希靖,达朝炳,李晶,等.搅拌摩擦焊缝中的洋葱环形成分析[J].中国有色金属学报,2006,16(10):1672-1677.
[7]达朝炳.搅拌摩擦焊接头缺陷分析[J].热加工工艺,2009,38(5):133-137.
[8]Bahrami M,Givi M K B,Dehghani K,et al.On the role of pin geometry in microstructure and mechanical properties of AA7075/SiC nano-composite fabricated by friction stir welding technique[J].Materials&Design,2014,53:519-527.
[9]Bahrami M,Nikoo M F,Givi M K B.Microstructural and mechanical behaviors of nona-SiC-reinforced AA7075-O FSWjoints prepared through two passes[J].Materials Sicense and Engeering A,2015,626:220-228.
[10]Jamalian H M,Ramezani H,Ghobadi H,et al.Processingstructure-property correlation in nano-SiC-reinforced friction stir welded aluminum joints[J].Journal of Manufacturing Processes,2016,21:180-189.
[11]Khorrami M S,Kazeminezhad M,Kokabi A H.Thermal stability of aluminum after friction stir processing with SiC nanoparticles[J].Materials&Design,2015,80:41-50.