镍基N06022合金管固溶过程中显微组织和性能的演变

doi:10.13251/j.issn.0254-6051.2022.12.034

摘要/Abstract

摘要： 通过光学显微镜、扫描电镜、能谱分析仪和力学、腐蚀性能试验等,研究了固溶处理对镍基N06022合金管微观结构演变和性能的影响。结果表明,冷轧态N06022合金管含有大量的析出相。由于析出相对晶界的钉扎效应,固溶温度在1100 ℃以下,平均晶粒尺寸几乎不受保温时间的影响。固溶温度升高至1150 ℃,晶粒尺寸和生长速率急剧增加,这主要与析出相的溶解有关。在1000~1200 ℃固溶温度内,保温15 min和30 min晶粒长大激活能分别为Q_B=646.56 kJ/mol、Q_C=566.45 kJ/mol,且合金的强度与晶粒尺寸之间的关系满足Hall-Petch关系式。随着固溶温度的升高,合金晶间腐蚀速率呈现先降低后平稳的趋势,强度和硬度呈现先慢后快的下降趋势,伸长率呈现先慢后快的上升趋势。保温15 min,固溶温度在1150 ℃左右时,硬度曲线与伸长率曲线出现交点,腐蚀率平稳,为最优固溶处理工艺。

关键词: N06022合金, 固溶处理, 显微组织, 拉伸性能, 硬度

Abstract: Influence of solution treatment on microstructure evolution and properties of nickel-based N06022 alloy pipe was investigated by metallographic microscopy, scanning electron microscopy, energy spectrum analyzer, mechanical and corrosion performance test. The results show that the cold-rolled N06022 alloy pipe contains a large amount of precipitated phases, which have a pinning effect on grain boundaries, and the average grain size of the steel is hardly affected by the holding time, when the solution temperature is below 1100 ℃. When solution temperature increases to 1150 ℃, the grain size and growth rate increase sharply, which is mainly related to the dissolution of the precipitated phase. In the solution temperature range of 1000-1200 ℃, the activation energy of grain growth for 15 min and 30 min is Q_B=646.56 kJ/mol, Q_C=566.45 kJ/mol, respectively, and the relationship between the properties of the alloy and the grain size satisfies the Hall-Petch relationship. With the increase of solution temperature, the intergranular corrosion rate of the alloy decreases first and then stabilizes, the strength and hardness show slow-fast downward trend, and the elongation shows slow-fast upward trend. When the holding time is 15 min and the solution temperature is about 1150 ℃, the intersection of hardness curve and elongation curve appears, and the corrosion rate is stable, which is the optimal solution treatment process.

Key words: N06022 alloy, solution treatment, microstructure, tensile properties, hardness

中图分类号:

TG156

秦兴文, 丁文炎, 涂正平, 沈诚飞. 镍基N06022合金管固溶过程中显微组织和性能的演变[J]. 金属热处理, 2022, 47(12): 201-209.

Qin Xingwen, Ding Wenyan, Tu Zhengping, Shen Chengfei. Evolution of microstructure and properties of nickel-based N06022 alloy pipe during solution treatment[J]. Heat Treatment of Metals, 2022, 47(12): 201-209.

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