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Study on the Microstructure and Stress Relaxation Behavior of INCONEL Alloy 783

Author: ShenZhi
Tutor: DanAiDang；ShenHongWei
School: Shanghai Jiaotong University
Course: Materials Science
Keywords: Superalloy Low expansion Stress relaxation Activation volume Organizational stability
CLC: TG132.32
Type: Master's thesis
Year: 2010
Downloads: 45
Quote: 0
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Abstract


INCONEL 783 alloy as an aviation with a low expansion superalloy, has been used for the production of ultra-supercritical thermal power generating units bolt, and may be used for future higher parameters such as above 650oC unit. However, at home and abroad of the alloy the turbine conditions applied research extremely lack the necessary data can not provide for the safe and rational use of the alloy. Of domestic and imported two alloys, one with the material JMatPro performance simulation software combined with experimental analysis to assess the reasonableness of the heat treatment of the alloy, the evolution of the high-temperature stress relaxation characteristics and related organizations behavior analyzed. The results showed that: the standard solution temperature of the heat treatment process for the the IN783 alloy of nominal composition is reasonable, but the actual Nb, higher Al content alloy containing C is low. The thermodynamic calculations show that the 783 alloy precipitation of eta-phase sensitive. In order to avoid the precipitation of η phase, temperature suggested not exceed 650oC level. In addition, the alloying elements Cr, Fe stable γ 'advantageously reduces Co, Nb content of the formation of the η phase can be suppressed. beta aging the turbine bolt application is still necessary, and its role is not only to improve the oxidation resistance of the grain boundary, but also serve to slow the gamma 'precipitates inhibiting effect of η is formed. Imported alloys and domestic alloy compared to more the gamma 'precipitation and greater mismatch degree. γ 'in beta-aging will precipitate, and generates positive gamma / gamma' lattice mismatch. Lattice mismatch to increase efficiency, but additional negative mismatch in gamma 'secondary aging. 783 alloy at 575oC ~ 700oC under stress relaxation curve shows a rapid decline, and plateaued two stages. A short time relaxation data indicates that the alloy can be used in and below 600oC 625oC, there is a greater risk still require longer test evaluation. The changes of the aging process will affect the relaxation properties of the reversal of aging and additional high temperature aging lead alloy anti-relaxation weakening performance. Solution temperature changes and the solid solution has little effect on the relaxation behavior of 600oC, but higher temperatures such as 650oC, the solution temperature high performance anti-relaxation; 1000h better domestic alloy performance, the performance of anti-relaxation 600oC better than imported materials; 650oC performance was slightly lower than 1160oC solid solution imported materials, while higher than the standard process solid solution material. Domestic and imported alloy in the initial stage of relaxation exhibit high stress index decreased with the time and the temperature rise; activation volume within the range of the measured temperature with a temperature rise between 50 to 80 b3 first increased and then decreased substantially decreases with time; prescription system would significantly impact activation volume, but is the second choice of the solid solution and the solution temperature have little effect on the activation volume. In the beta-phase heat treatment, long-term aging and stress relaxation under the conditions have Heusler phase precipitates, and its degree of precipitate increased with temperature and time, but does not affect the performance of relaxation. 783 alloy stress relaxation is thermally activated auxiliary process, and gamma 'particle coarsening and dislocation reply, move jointly controlled by cross-slip and climb, the initial cross-slip dominant, with time, climb dominant.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > The alloy learn with a variety of properties of alloys > Special physical properties of alloys > Special thermal properties of alloys > Melting point alloys , refractory alloy , high temperature alloys
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