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Structural stability and mechanical properties of phosphorus modified Ni-Fe based superalloy GH984
C.; Zhao Wang, H.; Guo, Y.; Guo, J.; Zhou, L.
2014
Source PublicationMaterials Research Innovations
ISSN1432-8917
Volume18Pages:324-330
AbstractGH984 is a Ni-Fe based superalloy that has been used as superheater tube material in high pressure boilers for more than 10 years, and is now being considered for use as superheater, reheater and header material for boilers in 700 degrees C advanced ultrasupercritical (A-USC) coal fired power plants. In order to meet the requirements of 700 degrees C A-USC boilers, the alloy composition must be optimised to enhance thermal stability and improve mechanical properties. In this paper, the influence of phosphorus (P) on the structural stability and mechanical properties of the GH984 alloy was investigated. The results show that P has no influence on the major precipitates, which are spherical gamma', blocky MC and discrete M23C6 at the grain boundary after standard heat treatment, except decreases in the size of M23C6. After the thermal exposure at 700 degrees C for 1000 h, at the grain boundary, the morphology of M23C6 changes from a blocky and irregular shape to a blocky and nodular shape, and the size decreases with the increase in P content. Additionally, the growth rate of M23C6 increases with increasing the thermal exposure temperature from 700 to 800 degrees C. The P content has no obvious influence on the tensile strength and ductility. However, at 700 degrees C/350 MPa and 750 degrees C/300 MPa, the rupture life obviously increases with increasing the P content due to the improvement of grain boundary strength when the content of P is lower than 0.034 wt-%. It can be concluded that the addition of P can increase the rupture life and improve the structural stability of GH984.
description.department[wang, c. ; zhao, h. ; guo, y. ; guo, j. ; zhou, l.] chinese acad sci, inst met res, shenyang 110016, peoples r china. ; zhou, l (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china. ; lzz@imr.ac.cn
Keyword700 Degrees c A-usc Ni-fe Based Superalloy Gh984 Phosphorus Structural Stability Mechanical Properties Vacancy Formation Energies Reducing Grain-boundary Coal Power-plants Solute Segregation Dislocation Line Alloy Microstructure Boron
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Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/73941
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
C.,Zhao Wang, H.,Guo, Y.,et al. Structural stability and mechanical properties of phosphorus modified Ni-Fe based superalloy GH984[J]. Materials Research Innovations,2014,18:324-330.
APA C.,Zhao Wang, H.,Guo, Y.,Guo, J.,&Zhou, L..(2014).Structural stability and mechanical properties of phosphorus modified Ni-Fe based superalloy GH984.Materials Research Innovations,18,324-330.
MLA C.,et al."Structural stability and mechanical properties of phosphorus modified Ni-Fe based superalloy GH984".Materials Research Innovations 18(2014):324-330.
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