H70黄铜冷源辅助搅拌摩擦焊接头微观组织和力学性能分析
Research on microstructure and mechanical properties of cold source assisted friction stir welded H70 brass joint
-
摘要: 采用冷源辅助搅拌摩擦焊对2 mm厚的H70黄铜进行焊接，利用光学显微镜.扫描和透射电子显微镜、电子背散射衍射、显微硬度测试及拉伸试验对焊接接头的微观组织和力学性能进行研究.结果表明，在搅拌摩擦焊的过程中通过采用液氮冷却的方法不仅能降低搅拌区的峰值温度，而且可以显著提高搅拌区的冷却速度，有效抑制了由焊后余热带来的退火软化作用，消除了热影响区.搅拌区组织由高位错密度的超细晶组成，并具有较强的{—1 1 2} < 1 1 0 > 剪切织构.搅拌区抗拉强度较母材提高了58%的同时，断后伸长率没有显著降低，改善了焊缝的强韧性.Abstract: H70 brass plates with 2-mm-thick were successfully joined by cold source assisted friction stir welding. The microstructure and mechanical properties of the welded joint were investigated by optical microscopy, scanning/transmission electron microscopy, electron backscatter diffraction, microhardness measurement and tensile tests. The obtained results showed that significant reduced peak temperature and increased cooling rate were achieved by using liquid nitrogen cooling. The stir zone showed the ultra-refined grain structure with high dislocation density. The crystallographic shear texture whose dominant component of {-1 1 2}<1 1 0> was also found. The heat-affected zone disappeared as well. As a result, the ultimate tensile strength was enhanced by 58% compared with that of the base metal without ductility loss. A good strength-ductility synergy achieved by using cold source assisted friction stir welding technology.
-
Keywords:
- brass /
- FSW /
- rapid cooling /
- microstructure /
- mechanical properties
-
-
[1] Pasebani S, Toroghinejad M R, Hosseini M, et al. Textural evolution of nano-grained 70/30 brass produced by accumulative roll-bonding[J]. Materials Science & Engineering A, 2010, 527(7-8):2050-2056. [2] Mishra R S, Ma Z Y. Friction stir welding and processing[J]. Materials Science & Engineering R, 2005, 50(1):1-78. [3] Meran C. The joint properties of brass plates by friction stir welding[J]. Materials & Design, 2006, 27(9):719-726. [4] Moghaddam M S, Parvizi R, Haddad-Sabzevar M, et al. Microstructural and mechanical properties of friction stir welded Cu-30Zn brass alloy at various feed speeds:Influence of stir bands[J]. Materials & Design, 2011, 32(5):2749-2755. [5] Humphreys F J, Hatherly M. Recrystallization and related annealing phenomena (Second Edition)[M]. Elsevier, 2004. [6] Fonda R W, Knipling K E. Texture development in friction stir welds[J]. Science & Technology of Welding & Joining, 2005, 16(4):288-294. [7] Mironov S, Masaki K, Sato Y S, et al. Texture produced by abnormal grain growth in friction stir-welded aluminum alloy 1050[J]. Metallurgical & Materials Transactions A, 2013, 44(3):1153-1157. [8] Su J Q, Nelson T W, Mcnelley T R, et al. Development of nanocrystalline structure in Cu during friction stir processing (FSP)[J]. Materials Science & Engineering A, 2011, 528(16):5458-5464. -
期刊类型引用(3)
1. 王颖，高胜，戴哲. 基于CNN-Transformer混合网络的焊缝激光条纹分割. 中国激光. 2024(24): 113-124 . 
百度学术
2. 乐猛，张华，叶艳辉，尚志军，赵琪. 膜式壁焊缝图像处理及其识别方法. 热加工工艺. 2021(01): 107-111 . 百度学术
3. 张世宽，吴清潇，林智远. 焊缝图像中结构光条纹的检测与分割. 光学学报. 2021(05): 88-96 . 百度学术
其他类型引用(1)
计量
- 文章访问数: 960
- HTML全文浏览量: 10
- PDF下载量: 78
- 被引次数: 4
下载:
