Effect of heat treatment on grain growth behavior of C-276 alloy seamless tube

doi:10.13251/j.issn.0254-6051.2020.02.002

Abstract

Abstract:

Effect of different heat treatment processes on the grain growth behavior of cold rolled C-276 alloy seamless tubes was studied. The results show that the grain size of the alloy increases gradually with the increase of heat treatment temperatures at the same holding time, and the trend of grain growth is the same at different holding time. The grain growth is relatively rapid when the heat treatment temperature is 1040-1080 ℃, then slows down when the temperature is 1080-1160 ℃, and accelerates again in the range of 1160-1200 ℃. The apparent activation energy of the grain boundary migration of the C-276 alloy is 313.77 kJ/mol after holding at 1040-1200 ℃ for 10 min. When the heat treatment temperature is 1040 to 1080 ℃, the grain grows slowly with the increase of holding time. When the temperature is 1120 to 1160 ℃, the grain grows faster within 10 min, and slows down when more than 10 min. When the temperature rises to 1200 ℃, the grain growth trend is more gradual with the increase of holding time. The grain growth kinetics time index η of the C-276 alloy increases first and then decreases with the increase of temperatures in the range of 1040-1200 ℃.

Key words: heat treatment, C-276 alloy, grain growth, activation energy

CLC Number:

TG156.94

Lu Yan, Gao Pei. Effect of heat treatment on grain growth behavior of C-276 alloy seamless tube[J]. HTM, 2020, 45(2): 7-10.

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