固溶处理对超超临界电站用镍基耐热合金组织及性能的影响

doi:10.13251/j.issn.0254-6051.2020.03.019

摘要/Abstract

摘要：

通过提高Inconel 617合金Al和Ti含量、增加B元素,获得一种超超临界电站用镍基耐热合金,研究固溶处理对合金组织及性能的影响。结果表明:1100~1190 ℃固溶2 h,随固溶温度提高,平均晶粒尺寸从68 μm长大至139 μm,硬度从203 HBW降至175 HBW;1100 ℃固溶1~4 h,晶内碳化物逐渐回溶,晶界碳化物沿晶界断续状分布且变化不明显。固溶温度提高,合金高温拉伸、室温冲击性能降低;炉冷试样高温拉伸性能略低于水冷试样,但显著高于Inconel 617合金。推荐试验合金固溶热处理工艺为1100 ℃×2 h水冷。

关键词: 固溶处理, 超超临界, 镍基耐热合金, 组织, 性能

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

中图分类号:

TG156.94

田仲良, 陈正宗, 何西扣, 包汉生, 刘正东. 固溶处理对超超临界电站用镍基耐热合金组织及性能的影响[J]. 金属热处理, 2020, 45(3): 97-102.

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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