热处理温度对冷变形Inconel625合金管组织及性能的影响

doi:10.13251/j.issn.0254-6051.2021.09.030

摘要/Abstract

摘要： 通过金相分析、拉伸试验、硬度试验以及硝酸腐蚀试验,研究了热处理温度对Inconel625合金管组织、力学性能和腐蚀性能的影响。结果表明:热处理后合金组织基本为等轴晶,随着温度的升高,晶粒长大速率呈先慢后快的趋势,且晶粒长大激活能为144.14 kJ/mol;Inconel625合金管的抗拉强度、硬度随着热处理温度的升高而减小,且在960~1160 ℃温度范围内,抗拉强度、硬度与晶粒尺寸关系满足Hall-Pecth关系式。随温度的升高,Inconel625合金管的断裂方式由解理断裂向韧性断裂转变,晶间腐蚀速率呈先下降后平稳的趋势。温度在1080 ℃附近时,硬度与伸长率曲线出现交点,腐蚀速率平稳,为最佳热处理温度。

关键词: Inconel625合金管, 热处理温度, 组织, 力学性能, 晶间腐蚀

Abstract: Effect of heat treatment temperature on microstructure, mechanical properties and corrosion properties of the Inconel625 stainless steel pipe was studied through metallographic analysis, tensile experiment, hardness experiment and nitric acid corrosion experiment. The results show that the microstructure of the alloy is basically equiaxed grains after heat treatment. With the increase of temperature, the growth rate of grain size shows a trend of slow first and then fast. And the activation energy for grain growth is 144.14 kJ/mol. The tensile strength and hardness of the Inconel625 alloy pipe decrease with the increase of heat treatment temperature. And in the temperature range between 960-1160 ℃, the relationship between tensile strength, hardness and grain size abides by the Hall-Pecth relationship. With the increase of temperature, the fracture mode of the Inconel625 alloy changes from cleavage fracture to ductile fracture; and the rate of intergranular corrosion shows a trend that first decreases and then stabilizes. When the temperature is about 1080 ℃, the curves of hardness and elongation intersects, and the rate of intergranular corrosion are stable , which is the best heat treatment temperature.

Key words: Inconel625 alloy pipe, heat treatment temperature, microstructure, mechanical properties, intergranular corrosion

中图分类号:

TG156

秦兴文, 王坤, 佴启亮, 杜雷. 热处理温度对冷变形Inconel625合金管组织及性能的影响[J]. 金属热处理, 2021, 46(9): 164-169.

Qin Xingwen, Wang Kun, Nai Qiliang, Du Lei. Effect of heat treatment temperature on microstructure and properties of cold deformed Inconel625 alloy pipe[J]. Heat Treatment of Metals, 2021, 46(9): 164-169.

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