压力容器2016，Vol.33Issue(10)：1-8,8.DOI:10.3969/j.issn.1001-4837.2016.10.001
厚壁管多道焊缝金属的局部微区蠕变性能试验研究
Experimental Study on Creep Properties of Local Zones in a Weld Metal Produced by Multi-pass Welding of Thick-walled Pipes
杨滨 1刘新平 1轩福贞1
作者信息
- 1. 华东理工大学 机械与动力工程学院 承压系统与安全教育部重点实验室，上海 200237
- 折叠
摘要
Abstract
Creep test with micro-specimens were conducted to study the properties of local zones in a heat resistant steel weld metal produced by multi-pass welding.The relationship between fracture morphology and microstructure of creep ruptured specimens was investigated.Results shown that different creep prop-erties can be clearly observed in local zones in multi-pass weld metal.The creep strength of specimen lo-cated in the weld pass parallel to welding direction has a maximum value,followed by that through multi-ple weld passes,and that located in the weld pass overlap perpendicular to welding direction.Meanwhile, the corresponding creep crack initiation sites are coarse grain zone,columnar grain zone and recrystallized grain zone,respectively.The above difference among local zones can induce the variation of the deforma-tion amplitude during primary and secondary creep stages,while it nearly has no effect on deformation law.The composition of specimen may be different as sampling location changes,while the applied stress on local zones may be different even for the same load when sampling direction changes.Both of them lead to macroscopic anisotropic creep behavior of multi-pass weld metal.关键词
多道焊缝金属/蠕变性能/不均匀组织/失效模式Key words
multi-pass weld metal/creep properties/inhomogeneous microstructure/failure modes分类
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杨滨,刘新平,轩福贞..厚壁管多道焊缝金属的局部微区蠕变性能试验研究[J].压力容器,2016,33(10):1-8,8.
