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| SA335 P91钢管焊接接头根部裂纹分析 | |
| 引用本文： | 黄嗣罗,张建勋,陈宗强.SA335 P91钢管焊接接头根部裂纹分析[J].压力容器,2004,21(5):36-40. |
| 作者姓名： | 黄嗣罗 张建勋 陈宗强 |
| 作者单位： | 1. 西安交通大学,陕西,西安,710049;茂名石化机械厂,广东,茂名,525024 2. 西安交通大学,陕西,西安,710049 3. 茂名石化机械厂,广东,茂名,525024 |
| 摘 要： | 介绍了SA335P91钢管对接全位置固定单面焊双面成形接头焊缝交汇处所产生的背面裂纹。断口电镜扫描和能谱分析的结果表明 :此类裂纹属于结晶裂纹 ,产生的原因是由于该处形成了粗大且方向性极强的胞状树枝晶组织 ,出现了比较严重的结晶偏析并导致晶界上S、P含量偏高 ,此外 ,该处所存在的背面凹坑也会导致收缩时产生较大的应力集中。 |
| 关 键 词： | SA335 P91 焊接接头 结晶裂纹 |
| 文章编号： | 1001-4837(2004)05-0036-05 |
Investigation of the Root Cracking of SA335 P91 Steel Welded Joint |
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| HUANG Si-luo ,ZHANG Jian-xun ,CHEN Zong-qiang.Investigation of the Root Cracking of SA335 P91 Steel Welded Joint[J].Pressure Vessel Technology,2004,21(5):36-40. | |
| Authors: | HUANG Si-luo ZHANG Jian-xun CHEN Zong-qiang |
| Affiliation: | HUANG Si-luo 1,2,ZHANG Jian-xun 1,CHEN Zong-qiang 2 |
| Abstract: | The back cracks initiated from welding conjuction in the SA335 P91 steel tube butt joint by all-position fixed one side welding with double shaped were investigated in present paper. It is shown from the electronfractography and energy spectrum analysis that this is the one of crystal crack. and the reason for these cracks is, at first, attributed to coarse cellular fir-tree crystal with intensive directivity in which the compositions of sulfur and phosphorus increase along the grain boundary for the serious crystal aliquation. In addition, it is because of the higher stress concentration induced from the contraction in back rut. |
| Keywords: | SA335 P91 welding joint crystal crack |
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