Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
권호 표지
DOI QR코드

DOI QR Code

Effect of Tungsten Contents and Heat Treatment on the Microstructures and Mechanical Properties of Hastelloy C-276 Alloy Investment Castings

정밀주조 Hastelloy C-276 합금의 미세조직과 기계적 성질에 미치는 W 함량과 열처리의 영향

  • Yoo, Byung-Ki (Modern Casting & Metals Co., Ltd.) ;
  • Park, Heung-Il (Dept. of Materials System Engineering, Pukyong National University) ;
  • Bae, Cha-Hurn (Modern Casting & Metals Co., Ltd.) ;
  • Kim, Sung-Gyoo (Dept. of Materials System Engineering, Pukyong National University) ;
  • Jeong, Hae-Yong (Dept. of Materials Science and Engineering, Pukyong National University)
  • Received : 2016.11.29
  • Accepted : 2017.02.13
  • Published : 2017.02.28
Download PDF
⟨ Previous Next ⟩

Abstract

The effects of W content and heat treatment on the microstructure and mechanical properties of Hastelloy C-276 alloy investment castings were discussed. As the W content was increased, dendritic microstructure was refined and network type precipitate formed during solidification was distributed on the dendritic grain boundaries. Cr, Fe and Mn were highly segregated in the Ni-based dendrite matrix, and Mo, W, C and Si were in the precipitates. Due to the heat treatment, fine granular and flake precipitates were newly formed in the matrix, and unresolved network type precipitates remained on the grain boundary. The network type precipitates and the granular and flake precipitates formed by heat treatment were confirmed to be ${\mu}$ phase intermetallic compounds with similar compositions. Due to the increase of the W content and the heat treatment, hardness and tensile strength were significantly increased. However, tensile strength after aging treatment was decreased with the W content. These results can be explained in that brittle fracturing by the unresolved network type precipitates dispersed in the grain boundary was predominant over ductile fracturing by the dimple ruptures originating from the fine granular precipitates in the matrix.

Keywords

References

  1. J. R. Davis, ASM Specialty Handbook: Nickel, Cobalt, and Their Alloys, ASM international, OH (2000) 1-67.
  2. Lee M. Pike, The Minerals, Metals & Materials Society, "100+ Years Wrought Alloy Development at Haynes International", (2014) 15-30.
  3. Haynes International, Inc., "Fabrication of $Haynes^{(R)}$ and $Hastelloy^{(R)}$ Solid-solution-strengthened high temperature alloys", (2002) 1-59.
  4. Haynes International, Inc., "$HASTELLOY^{(R)}$ C-276 alloy" (1997) 1-16.
  5. H. M. Tawancy, R. B. Herchenroeder and A. I. Asphahani, J. of Metals, "High-Performance Ni-Cr-Mo-W Alloys", 35 (1983) 37-43.
  6. www.specialmetals.com/assets/documents/alloys/inconelalloy-c-276.pdf.
  7. A. K. Yadav, International J. of Innovation Research in Science and Engineering, "A review on research trend in corrosion resistant alloy (HASTELLOY)" 2 (2016) 310-321.
  8. ASM International, ASM Handbook Volume 15: Casting, ASM International, OH (2008) 646-661.
  9. S. Pattnaik, D. B. Karunakar and P. K. Jha, J. of Materials Processing Technology, "Developments in investment casting process-A review", 212 (2012) 2332-2348. https://doi.org/10.1016/j.jmatprotec.2012.06.003
  10. C. M. Cheah, C. K. Chua, Lee CW, C. Feng and K. Totong, International J. of Advanced Manufacturing Technology, "Rapid prototyping and tooling techniques: a review of applications for rapid investment casting", 25 (2005) 308-320. https://doi.org/10.1007/s00170-003-1840-6
  11. M. J. Cieslak, T. J. Headley and Romig, Jr., Metallurgical Transactions A, "The welding metallurgy of Hastelloy alloys C-4, C-22, and C-276", 17A (1986) 2035-2047.
  12. Na GD, Yoo YT, Shin HJ and Oh YS, J. of KWJS, "A study on the welding chracteristics of Hastelloy C-276 using a continuous wave Nd:YAG laser", 26 (2008) 481-491.
  13. M. Ahmad, J. I. Akhter, et al., dies of the electron beam welded zone of Hastelloy C-276, 390 (2005) 88-93. https://doi.org/10.1016/j.jallcom.2004.08.031
  14. H. Atsumi, "The Solidification of Metals", Chijin Shokan, (1976) 34-53.
  15. M. C. Fleming, Solidification processing, McGraw-Hill Book Company, USA (1974) 58-92.
  16. ASM International, ASM Handbook Volume 15: Casting, ASM International, OH (2008) 299-306.
  17. Binary Alloy Phase Diagrams, Vol. 1, ASM International (1986) 842, 1611, 1774.
  18. Park HI, Doctoral Thesis, University of Ulsan, "The effect of alloying elements on the microstructure and mechanical properties of compacted vermicular graphite cast iron" (1989) 87-105.
  19. M. Raghavan, B. J. Berkowitz and J. C. Scanlon, Metallurgical Transactions A, "Electron microscopic analysis of heterogeneous precipitates in Hastelloy C-276", 13A (1982) 979-984.

Cited by

  1. 진공 정밀주조한 Inconel 713C 합금의 조직과 기계적 성질에 미치는 열처리의 영향 vol.40, pp.2, 2017, https://doi.org/10.7777/jkfs.2020.40.2.16