Effect of heat treatment temperature on microstructure and properties of cold deformed Inconel625 alloy pipe

doi:10.13251/j.issn.0254-6051.2021.09.030

Abstract

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

CLC Number:

TG156

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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