采用多层多道氩弧焊接HastelloyC-4材料,通过对比实验研究焊接接头和母材的耐晶间腐蚀性能,并通过显微硬度、金相显微镜、扫描电子显微镜、能谱分析表征接头组织和成分.结果表明:接头试样的平均腐蚀速率小于母材试样,接头耐晶间腐蚀性能较好.采用Cr含量高配比填充焊丝,同时严格控制层间温度,利用焊接热循环固溶处理已有焊缝,促进焊缝成分均匀,改善接头在氧化性介质中耐晶间腐蚀性能.
HastelloyC-4 pipeline was welded by multi-pass arc welding. Contrastive determination of resistance to intergranular corrosion of HastelloyC-4 and its joint was conducted. Microstructure and composition of welding joint were analyzed by using microhardness, optical metallography, scanning electron microscopy (SEM) and energy dispersive spectrum analysis (EDS). The results show that the average of intergranular corrosion velocity of joint samples is smaller than that of base alloy samples. With filler wire including higher Cr component, Cr component of weld metal grain boundary is higher than that of base alloy. And with appropriate energy input, follow pass welding offers solution treatment to former weld metal. Both of them improve resistance property to intergranular corrosion of HastelloyC-4 arc welding joint in oxidizing media.
参考文献
| [1] | 邢卓.Hastelloy C系列合金综述[J].化工设备与管道,2007(02):51-58. |
| [2] | CROOK P;CARUSO M;KINGSEED D .Corrosion resistance of a new wrought Ni-Cr-Mo alloy[J].Materials Science and Design,1997,36(03):49-52. |
| [3] | R.K. SIDHU;O.A. OJO;M.C. CHATURVEDI .Microstructural Analysis of Laser-Beam-Welded Directionally Solidified INCONEL 738[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2007(4):858-870. |
| [4] | OGBORN J;OLSON D;CIESLAK M .Influence of solidification on the microstructural evolution of nickel base weld metal[J].Materials Science and Engineering A,1995,203:134-139. |
| [5] | Huerta D;Siefert B .Intercrystalline corrosion of surface-welds of nickel alloys on carbon steel[J].Journal of Materials Science,2005(19):5153-5159. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%