Effect of solution treatment on microstructure and mechanical properties of heat-resisting Ni-based alloy used for ultra-supercritical power plant

doi:10.13251/j.issn.0254-6051.2020.03.019

Abstract

Abstract:

A nickel-based heat-resistant alloy used for ultra-supercritical power plants was developed by optimizing commercial Inconel 617 alloy through increasing Al and Ti content with B addition. The effects of solution treatment on the microstructure and properties of this alloy was also investigated. The results show that the average grain size increases from 68 μm to 139 μm and the hardness decreases from 203 HBW to 175 HBW with the solution temperature increasing from 1100 ℃ to 1190 ℃ for 2 h. After solution treatment at 1100 ℃ for 1-4 h, the intragranular carbides can be gradually dissolved, and the discontinuous carbides distributed along grain boundaries with no significantly change. With the increase of solution temperature, both the high temperature tensile property and impact toughness at room temperature of the alloy decrease. Although the high temperature tensile property of furnace-cooled sample is slightly lower than that of water-cooled (WQ) sample, it is obvious higher than that of Inconel 617 alloy. The recommended solution heat treatment for the experimental alloy consists of solution treating at 1100 ℃ for 2 h, and water quenching.

Key words: solution treatment, ultra-supercritical, Ni-based heat-resisting alloy, microstructure, mechanical properties

CLC Number:

TG156.94

Tian Zhongliang, Chen Zhengzong, He Xikou, Bao Hansheng, Liu Zhengdong. Effect of solution treatment on microstructure and mechanical properties of heat-resisting Ni-based alloy used for ultra-supercritical power plant[J]. HTM, 2020, 45(3): 97-102.

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