摘要
为了研究工业纯锆在焊缝不同区域的分布、金相组织和力学性能之间的关系,采用TIG方法焊接锆R60702工业纯锆板对接焊缝,采用光学显微镜、电子探针和显微硬度计等仪器,分析焊缝母材区、热影响区、熔合区和焊缝区的金相组织、机械性能和元素分布特性.研究结果表明:对接接头各区域的组织不同,母材区的晶粒为等轴状,呈面织构;不完全重结晶区的晶粒亦为等轴状,而且更细于母材晶粒,因而强度、塑性优良;过热区的晶粒则较粗大;焊缝区组织为铸态晶粒,形状为纤维状;对接接头各区的元素分布较为均匀,没有明显的偏析现象;焊接接头的硬度呈W型分布,最高硬度分布在焊缝区达到290 HV50 g,最低硬度分布在不完全重结晶区,达到162 HV50 g,过热区则介于母材区与焊缝区之间.
The element distribution,metallurgical structure and mechanical properties in different parts as base-zone,heat-treatment zone,and welded seam in butt-jointed seam of industrial pure zirconium R60702 welded with TIG was analyzed using optical microscope,electron probe and microhardness tester to study the relationship of microstructure and mechanical properties. The results show that different zones of the butt-jointed seam have different metallurgical structures： the crystalline grains in the base metal are equiaxed and surface textured; smaller and equiaxed grains in incomplete recrystallization zone create better mechanical properties in strength and plasticity; coarse grains are found in over-heated zone; and the casting organization with fibre structure is obtained in welded seam zone. The elements distribute uniformly in the butt-welded seam without obvious segregation. The hardness distribution in the butt-jointed seam between the base metal to the welded seam zone is depicted as W-shape： the maximum micro-hardness reaches 290 HV50 gat the position of welded seam,the minimum harness is located in the overheated zone with a value of 162 HV50 g,and the hardness of over-heated zone fall in between.
出处
《西南交通大学学报》
EI
CSCD
北大核心
2014年第5期862-868,共7页
Journal of Southwest Jiaotong University
基金
中国博士后科学基金资助项目(2012M511015)
关键词
R60702
焊接
金相组织
力学性能
元素分布
R60702
welding
metallurgical structure
mechanical properties
element distribution
