亚共析U-Nb合金激光焊接接头的微观结构及力学性能

金属学报, 2014, 50(3): 379-386. doi: 10.3724/SP.J.1037.2013.00493

亚共析U-Nb合金激光焊接接头的微观结构及力学性能

李玉斌 ^1, , 王巍 ^2, , 何建军 ^3, , 张志强 ^4, , 张彤燕 ^5,

1.中国工程物理研究院,绵阳,621900

2.中国工程物理研究院,绵阳,621900

3.中国工程物理研究院,绵阳,621900

4.中国工程物理研究院,绵阳,621900

5.中国工程物理研究院,绵阳,621900

基金项目: 中国工程物理研究院发展基金资助项目2011B0301055 Development Fund of China Academy of Engineering Physics(2011B0301055)

关键词：亚共析U-Nb合金 , 激光焊接 , 微观结构 , 力学性能 , 动态压缩

MICROSTRUCTURE AND MECHANICAL PROPERTY OF LASER WELDED JOINT FOR HYPOEUTECTOID U-Nb ALLOY

Keywords： hypoeutectoid U-Nb alloy , laser welding , microstructure , mechanical property , dynamic compression

采用OM,XRD,TEM等分析手段,并结合静、动态力学测试方法,研究了亚共析U-Nb合金激光焊接接头的微观结构和力学性能.结果表明,等温热处理下的亚共析U-Nb合金焊接基材为α-U+γ-U珠光体结构,激光焊缝在预热条件下为单相正交结构α'板条马氏体,非预热条件下为单相正交结构α'孪晶马氏体.两类焊接接头的抗拉强度皆约为400 MPa,远小于基材和焊缝组织强度,焊接接头未熔透和焊缝微观结构的断裂韧度较低是主要原因.比较基材和焊接接头的动态冲击压缩性能,相同冲击速率下,焊接接头应变率低于基材,而屈服强度高于基材.应变速率在2000～4000 s-1间,接头的流变应力均随应变速率的增加而增加,表现出明显的应变率强化效应,在2000 s-1应变速率下,接头发生了选择性塑性变形,绝热剪切带仅形成于基材和热影响区.

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