| XIE Guang,WU Lei,ZHENG Wei,PENG Jian-qiang,ZHANG Shao-hua,LU Yu-zhang,SHEN Jian,XIE Yu-jiang.Influence of Micro-arc Carburization on the Surface Recrystallization in a Directionally Solidified Superalloy[J],45(2):118-123,161 |
| Influence of Micro-arc Carburization on the Surface Recrystallization in a Directionally Solidified Superalloy |
| Received:September 29, 2015 Revised:February 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.02.018 |
| KeyWord:directional solidification superalloy recrystallization carburization shot-peening XRD |
| Author | Institution |
| XIE Guang |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China |
| WU Lei |
Guiyang AVIC Power Investment Casting Ltd Co. , Guiyang , China |
| ZHENG Wei |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China |
| PENG Jian-qiang |
Harbin Turbine Co. Ltd, Harbin , China |
| ZHANG Shao-hua |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China |
| LU Yu-zhang |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China |
| SHEN Jian |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China |
| XIE Yu-jiang |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China |
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| Abstract: |
| Objective To investigate the control effect of micro-arc carburization on the surface recrystallization (RX) of a directionally solidified superalloy DZ125L. Methods After being deformed by shot-peening, the DZ125L samples were carburized by micro-arc carburization with graphite bars. And then they were heat treated with those samples that were shot-peened directly. Microstructure was characterized by optical microscopy (OM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). Results Compared with surface recrystallization produced by direct shot-peening, the depth of surface recrystallization after microarc carburization combined with shot-peening accounted for only about 60% of samples without micro-arc carburization. The XRD analysis indicated that plenty of TiC and (Cr,Mo) 23 C6 were formed on the surface layer of alloy after micro-arc carburization treatment. Enrichment of Ti, Mo, W, Cr and C was found by energy dispersive spectroscopy ( EDS) analysis on the surface layer of carburization treated samples, which further indicated that plenty of carbides were formed. These carbides retarded the migration of RX grain boundary. Furthermore, micro-arc carburization strengthened the surface layer of alloy and the carbides covered the surface of the alloy, which made the deformed layer become smaller and suppressed the RX nucleation on the surface, and resulted in the smaller RX depth finally. Conclusion Therefore, RX can be suppressed effectively by micro-arc carburization treatment. |
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