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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2013.1
- 수록면
- 215 - 225 (11page)
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The alloys required for fossil power plants are altered from stainless steel that has been used below $600^{\circ}C$ to Ni-based alloys that can operate at $700^{\circ}C$ for Hyper Super Critical (HSC) steam turbine. The IN740 alloy (Special Metals Co. USA) is proposed for improved rupture strength and corrosion resistance at high temperature. However, previous studies with experiments and simulations on stable phases at about $700^{\circ}C$ indicated the formation of the eta phase with the wasting of a gamma prime phase, which is the most important reinforced phase in precipitation hardened Ni alloys, and this resulted in the formation of precipitation free zones to decrease the strength. On the basis of thermodynamic calculation, the new Ni-based superalloy named LESS 1 (Low Eta Sigma Superalloy) was designed in this study to improve the strengthening effect and structure stability by depressing the formation of topologically close packed phases, especially sigma and eta phases at high temperature. A thermal exposure test was carried out to determine the microstructure stability of LESS 1 in comparison with IN740 at $800^{\circ}C$ for 300 hrs. The experimental results show that a needle-shaped eta phase was formed in the grin boundary and it grew to intragrain, and a precipitation free zone was also observed in IN740, but these defects were entirely controlled in LESS 1.
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참고문헌 (31)
참고문헌 신청
Brialn V / 2007 / Overview of Oxy- Combustion Technology for Utility Coal-Fired Boilers / Proc. of the 5th Inter. Conf. Advances in Materials Thechnology for Fossil Power Plants :968~981
Yamamoto R / 2007 / Development of Ni-Based Superalloy for Advanced 700oC Class Steam Turbines / Proc. of the 5th Inter. Conf. Advances in Materials Thechnology for Fossil Power Plants :434~446
Fukuda M / 2007 / The Next Generation of USC Technology in Japan / Proc. of the Inter. Conf. on Power Engineering :20~25
Cao Y / 2007 / Development of Ultra Supercritical Power Plant in China / Proc. of the Inter. Conf. on Power Engineering :231~236
Otsuka T / 2007 / Development History and Operation Experience of Ultra Supercritical Power Plants / Proc. of the Inter. Conf. on Power Engineering :214~218
Yamamoto R / 2007 / Development of Ni-Based Superalloy for Advanced 700oC Class Steam Turbines / Proc. of the 5th Inter. Conf. Advances in Materials Thechnology for Fossil Power Plants :434~446
Fukuda M / 2007 / The Next Generation of USC Technology in Japan / Proc. of the Inter. Conf. on Power Engineering :20~25
Cao Y / 2007 / Development of Ultra Supercritical Power Plant in China / Proc. of the Inter. Conf. on Power Engineering :231~236
Otsuka T / 2007 / Development History and Operation Experience of Ultra Supercritical Power Plants / Proc. of the Inter. Conf. on Power Engineering :214~218
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