JOURNAL BROWSE
Search
Advanced SearchSearch Tips
Effects of Post Weld Heat Treatment on Microstructures of Alloy 617 and 263 Welds for Turbines of HSC Power Plants
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
  • Journal title : Journal of Welding and Joining
  • Volume 34, Issue 3,  2016, pp.52-60
  • Publisher : The Korean Welding and Joining Society
  • DOI : 10.5781/JWJ.2016.34.3.52
 Title & Authors
Effects of Post Weld Heat Treatment on Microstructures of Alloy 617 and 263 Welds for Turbines of HSC Power Plants
Kim, Jeong Kil; Shim, Deog Nam; Park, Hae Ji;
  PDF(new window)
 Abstract
Recently nickel based superalloys are extensively being regarded as the materials for the steam turbine parts for hyper super critical (HSC) power plants working at the temperature over , since the materials have excellent strength and corrosion resistance in high temperature. In this paper, alloy 617 of solution strengthened material and alloy 263 of -precipitation strengthened material were prepared as the testing materials for HSC plants each other. Post weld heat treatment (PWHT) was conducted with the gas tungsten arc (GTA) welded specimens. The microstructure of the base metals and weld metals were investigated with Electron Probe Micro-Analysis (EPMA) and Scanning Transmission Electron Microscope (STEM). The experimental results revealed that Ti-Mo carbides were formed in both of the base metals and segregation of Co and Mo in both of the weld metals before PWHT and PWHT leaded to precipitation of various carbides such as Mo carbides in the specimens. Furthermore, fine particles, that were not precipitated in the specimens before PWHT, were observed in base metal as well as in the weld metal of alloy 263 after PWHT.
 Keywords
Hyper super critical power plant;Ni-based Superalloy;(Gamma prime) Precipitation;Steam turbine rotor;
 Language
Korean
 Cited by
 References
1.
S.H. Hong and G.S. Kim, Fossil power plant and welding technology, Journal of KWJS, 16(4) (1998), 1-8 (in Korean)

2.
H. J. Jang, S. Y. Kang, J. J. Lee, T. S. Kim and S. J. Park, Performance analysis of a multi-stage ultra-supercritical steam turbine using computational fluid dynamics, Applied Thermal Engineering 87 (2015), 352-361 crossref(new window)

3.
J. S. Ahn, J. K. Park, G. J. Lee and J. Y. Yoon, Study on the Improvement of Weld-joint Reliability in Waterwall Tubes of the Ultra Supercritical Coal Fired Boiler, J. Welding and Joining, 33 (4) (2015), 30-36 (in Korean)

4.
G. S. Brzozowska, D. M. Florez, J. Maier and G. Scheffknecht, Nickel-base superalloys for ultra-supercritical coal-fired power plants: Fireside corrosion. Laboratory studies and power plant exposures, Fuel, 108 (2013), 521-533 crossref(new window)

5.
F. Liu, M. Rashidi, L. Johansson, J. Hald, H.O. Andren, A new 12% chromium steel strengthened by Z-phase precipitates, Scripta Materialia, 113 (2016), 93-96 crossref(new window)

6.
W. G. Kim et al., Comparative Study on the High- Temperature Tensile and Creep Properties of Alloy 617 Base and Weld Metals, Journal of Mechanical Science and Technology, 27-8 (2013), 2331-2340 crossref(new window)

7.
K. N. Song, S. D. Hong, D. S. Ro, J. H. Lee and J. H. Hong, Measurement of Weld Material Properties of Alloy 617 Using an Instrumented Indentation Technique, Journal of KWJS, 31 (5) (2013), 41-46 (in Korean)

8.
G. Maier, O. Hubsch, H. Riedel, C. Somsen, J. Klower, and R. Mohrmann, Cyclic plasticity and lifetime of the nickel-based Alloy C-263: Experiments, models and component simulation, MATEC Web of Conferences 14 (2014)

9.
J.-C. ZHAO, V. RAVIKUMAR, and A.M. BELTRAN, Phase Precipitation and Phase Stability in Nimonic 263, METALLURGICAL AND MATERIALS TRANSACTIONS A, 32A (2001), 1271-1282

10.
M.H.Haafkens, J.H.G.Matty, A New Approach to the Weldability of Nickel-Base As-Cast and Powder Metallurgy superalloys, Welding. J., 61 (25), (1982)

11.
B.Radhakrishnan, R.G.Thompson, Effect of preweld microstructure on HAZ liquation cracking of Rene 80 superalloy Met. Trans., 24(A), (1993), 1409 crossref(new window)

12.
T.J.Kelly, Elemental Effects on the Cast 718 Weldability, Weld. J., 2, (1989), 44-51

13.
W.C Chung, J.Y. Haung, L. W. Tsay and C. Chen, Microstructure and stress corrosion cracking behavior of the weld metal in alloy 52-A508 dissimilar weld, Materials transctions, 52 (1) (2011), 12-19 crossref(new window)

14.
S. L. Jeong, H. T. Lee, J. Y. Huang and R. C. Kuo, Effect fo Nb on the microstructure and elevated temperature mechanical properties of alloy 690-SUS304L dissimilar welds, Materials transctions 49 (6) (2008), 1270-1277 crossref(new window)

15.
X. Ye, X. Hua, M. Wang, S. Lou, Controlling hot cracking in Ni-based Inconel-718 superalloy cast sheets during tungsten inert gas welding, Journal of Materials Processing Technology 222 (2015), 381-390 crossref(new window)

16.
C. R. Lee, S. H. Um, S. W. Kim, C. Chou and C. H. Lee, A study on hot ductility of Ni-base superalloys, Journal of KWJS, 22 (2) (2004), 157 -166 (in Korean)

17.
C. Crozet, A. Devaux and D. Bechet, Microstructure stability : Optimization of 263 Ni-based superalloy, Eurosuperalloy 2014 proceeding, 0164